Key takeaways
P0430 means the engine computer has judged the Bank 2 catalytic converter, on the side of a V6 or V8 without cylinder 1, to be cleaning the exhaust below its programmed threshold. With a steady light and an engine that runs normally you can drive gently to a diagnosis, but a flashing check engine light means stop driving.
- 01A worn converter is the usual end result, but a rear oxygen sensor, an exhaust leak, a misfire or old engine software can set the same code, so prove the cause before you buy parts.
- 02Ford, Chrysler, Volkswagen, Audi, Infiniti and Lexus have filed P0430 bulletins with NHTSA, and most call for an engine software update or a sensor check before any new converter.
- 03Federal law covers catalytic converters for 8 years or 80,000 miles from the original sale, and the coverage carries over to used cars.
- 04CarMD's 2025 averages put a converter at $1,510.88 and an oxygen sensor at $286.87, and California, Colorado and New York limit which replacement converters are legal.
This guide belongs to our OBD2 guide: most common codes section, which covers the wider topic.
P0430 means the catalytic converter on Bank 2 is no longer cleaning the exhaust as well as it should. Edmunds' P0430 explainer defines it as "Catalyst System Efficiency Below Threshold (Bank 2)," judged by oxygen sensors before and after the converter. Bank 2 exists only on engines with two rows of cylinders, which mostly means V6s and V8s.
With a steady light and a normal-running engine, you can drive gently to a diagnosis. A flashing light signals a severe problem, such as a misfire, that can damage the converter, so stop. The code names a result, not a part: Vehicle Service Pros' P0420/P0430 article puts these codes among the top 10 technicians face and warns that "odds are the ultimate fault lies somewhere else."
P0430 and its Bank 1 twin share a row in our table of the most common OBD2 codes with repair costs, where the converter is the priciest repair listed. This guide adds the Bank 2 details, bulletins, warranty terms and state rules that shape the fix.
P0430 Meaning and Severity at a Glance
P0430 means the Bank 2 converter failed the engine computer's efficiency test. With a steady light it is usually not an emergency, but it will fail an inspection that reads the OBD system.
| Question | Short answer |
|---|---|
| Full name | Catalyst System Efficiency Below Threshold (Bank 2) |
| What it means | The rear Bank 2 oxygen sensor is copying the front one |
| Engines that set it | Two-bank engines, mostly V6 and V8 |
| Severity | Urgent (RepairPal) to moderately severe (OBDeleven) |
| Safe to drive? | Steady light: gently, to a diagnosis. Flashing light: no |
| Usual fixes | Software update, oxygen sensor, exhaust leak repair or converter |
| Typical cost | $286.87 for an oxygen sensor, $1,510.88 for a converter |
Definition from Edmunds, meaning from RepairPal. Engine types from Identifix and Kelley Blue Book. Severity from RepairPal and OBDeleven. Costs are 2025 averages from the 2026 CarMD Vehicle Health Index.
Which side of the engine is Bank 2?
Bank 2 is the row of cylinders without cylinder 1, as Auto Barn and OBDeleven both describe it. Identifix's P0420 guide says inline engines normally use only P0420, and on V-type and horizontally opposed engines it says to check the cylinder numbering instead of guessing left or right.
Kelley Blue Book's P0171 code page says Bank 2 is typically found on V6, V8 and V10 engines, though some inline four-cylinders are split into two banks. OBDeleven goes further and lists inline-six engines too.
An Acura service bulletin notice labels P0430 "Front Bank Catalyst System Efficiency Below Threshold [Bank2]," so on those Acura engines, Bank 2 is the front row of cylinders. Infiniti's QX56 bulletin, by contrast, puts Bank 2 on the right side.
The sensor that grades the converter is Bank 2 Sensor 2. RepairPal describes it as the monitoring oxygen sensor mounted near the converter's outlet.
How the Rear Oxygen Sensor Grades the Bank 2 Converter
The engine computer compares the oxygen sensor ahead of the Bank 2 converter with the one behind it. A healthy converter stores oxygen, so the rear signal stays calm while the front one switches constantly.
Underhood Service's catalyst efficiency article says the converter stores a certain amount of oxygen and starts working at 400 to 600°F. Most converters begin at about 99 percent efficiency, taper to about 95 percent, and usually turn on the light below 92 percent.
As the converter degrades, Underhood's emission monitoring article says the downstream sensor's activity starts to mirror the upstream sensor. At a mathematically critical level, the PCM stores the code and turns on the light. Underhood also warns that stored or pending related codes can stop the monitor from ever running or completing.
P0430 Symptoms
Often the only sign is a steady check engine light. AutoZone's P0430 guide says you won't usually notice any performance issues. Other signs include:
- A failed emissions or smog test
- A rotten-egg or sulfur smell from the exhaust
- Less power and acceleration, or worse fuel economy
- A rattle underneath if the converter's insides have broken up
- A louder exhaust if a leak is part of the problem
- A rough idle in cold weather, or limp mode on some vehicles
Symptoms from AAA's catalytic converter cost guide, Edmunds, AutoZone and OBDeleven.
Is It Safe to Drive With a P0430 Code?
Usually yes, for short and gentle trips, if the light is steady and the engine runs normally. No, if the light flashes or the car loses power.
AAA's check engine light guide says it's OK to drive short distances as long as nothing is noticeably wrong. Edmunds advises against driving for an extended period, since it can damage the converter and other exhaust parts.
RepairPal's P0430 page rates the code Urgent, meaning immediate action is necessary. OBDeleven calls it moderately severe and says you can keep driving but should see a mechanic soon.
| What you notice | Severity | What to do |
|---|---|---|
| Steady light, engine feels normal | Moderate | Drive gently, diagnose soon |
| Steady light with less power or a rattle | High | Short trips only |
| Flashing light | Severe | Stop when safe, get immediate service |
| Loud exhaust, burning smell or major power loss | Severe | Pull over and shut the engine off |
Summarizes AAA, Edmunds, RepairPal, OBDeleven, Auto Barn, the EPA and the Ram owner's manual.
The 2022 Ram 2500/3500 owner's manual says a flashing light means severe catalytic converter damage and power loss will soon occur, and immediate service is required. With a steady light, it says most cars drive normally and don't need a tow.
The EPA's check engine light fact sheet is softer on a blinking light: you can still drive, but should minimize time on the road and avoid high speeds and heavy loads. Follow the carmaker.
A failing converter can start a fire
The Ram manual warns that a malfunctioning converter can run hotter than normal and cause a fire if you drive slowly or park over dry plants, wood or cardboard. Park on pavement until it's fixed.
Free tool
Check Engine Light Checker. Say whether the light is steady, flashing or has gone off, tick extras such as rough running, a recent fill-up or a red oil or temperature warning, and get a low-risk, act-soon or stop-and-check ruling.
The Check Engine Light Checker turns what the light is doing and how the car feels into a plain answer on whether to keep driving.
What Causes P0430? Most Likely First
A worn converter is the most common end result, but test the cheaper causes first. RepairPal says converters usually fail because something else, such as a misfire or an internal oil or coolant leak, went unrepaired, and VSP says many of these codes are corrected without replacing the converter.
In the 2026 CarMD Vehicle Health Index, converter replacement was the top check engine repair of 2025, at 7.43 percent of repairs. Yet CarMD says converters usually don't fail on newer vehicles unless a root cause, such as a faulty spark plug or oxygen sensor, is ignored.
A worn or damaged Bank 2 converter
VSP lists three failure modes: an overheated, melted or broken substrate; poisoning that coats it; and structural damage from road debris, stripped sensor threads, thermal shock or metal fatigue. If the root cause isn't fixed, VSP warns, the replacement won't last long.
An exhaust leak ahead of the rear sensor
Outside air leaking in ahead of the rear sensor makes a working converter look bad. Auto Barn's P0430 page points to leaks before or near the Bank 2 rear sensor, and VSP names damaged flex pipes and stripped sensor threads.
RepairPal notes that some converters are built into the exhaust manifold. Infiniti's QX56 bulletin replaces the Bank 2 manifold and catalyst together when P0430 is stored.
A failing downstream or upstream oxygen sensor
The rear sensor is the judge, so a lazy one can condemn a healthy converter, and AutoZone notes the fault can be the sensor itself. A Lexus bulletin for the RX 450h replaces the Bank 2 Sensor 2 oxygen sensor on some 2010 and 2011 models if it reads 1.275 volts or its impedance tops 300 ohms when warm.
Identifix lists replacing both oxygen sensors without proof as a common mistake. Our guide to failing sensors, their symptoms and replacement parts shows how a dying oxygen sensor usually behaves.
Misfires or a rich mixture that overheated it
CarMD notes that misfires can damage converters and warns that a failing ignition coil can do so if it isn't replaced promptly. VSP says even slight air-fuel variations can raise converter temperature significantly. If a misfire code is stored too, our P0300 random/multiple cylinder misfire code guide covers the tests that find it.
VSP also says to check whether one bank runs lean while the other runs rich. A Bank 2 lean code is P0174, and our P0171 system too lean code guide walks through the same fuel trim tests for Bank 1.
Oil or coolant poisoning the catalyst
VSP names excessive oil consumption, coolant leaking past the intake or head gaskets, and improper use of certain sealants. Underhood Service adds that head gasket coolant contaminates both oxygen sensors and the converter, so oxygen sensor and converter codes together point toward the head gasket.
Engine computer software
Sometimes the converter is fine and the test is off. VSP says false converter codes are not uncommon and a reflash may be all that's needed. Underhood says an updated calibration may keep a near-threshold converter's light off for another 10,000 or even up to 80,000 miles.
Wrong fuel, modifications and other causes
Identifix also lists a leaking fuel injector, the wrong fuel type, a faulty coolant temperature sensor or thermostat, and high fuel pressure. OBDeleven adds aftermarket exhaust changes and non-standard oxygen sensors, and Auto Barn says a low-quality aftermarket converter can bring the code back.
How to Diagnose P0430 With a Scanner
Prove what failed before you buy anything. You need live data and Mode $06, and Auto Barn notes that some manufacturer-specific readings aren't available on basic readers.
- Read every code, stored and pending. VSP says any fault that raises emissions or skews sensor readings can make a good converter fail, so fix those first.
- Save the freeze frame before clearing anything.
- Check for bulletins and software updates by VIN.
- Test drive. VSP says sluggish response may mean a melted or broken substrate is restricting flow. If you hear a rattle, RepairPal says to confirm it comes from the converter and not another exhaust part.
- Read fuel trims on both banks. OBDeleven's P0430 page puts normal trims between -5 and +5 percent.
- Graph both Bank 2 oxygen sensors at operating temperature. The front should switch and the rear should stay fairly steady.
- Check Mode $06 catalyst results, which VSP recommends on engines with wideband air-fuel sensors.
- Look for exhaust leaks with a smoke machine, an ultrasound detector or a shop vacuum and soapy water, as VSP describes.
- Compare converter temperatures. Identifix says the outlet should be hotter than the inlet.
- Check back pressure for a clog, as Identifix and RepairPal suggest.
- Repair, clear and confirm that the catalyst monitor runs and passes.
Reading the two Bank 2 sensor signals
| What the scan data shows | What it suggests |
|---|---|
| Front switching, rear nearly flat | Converter is storing oxygen; check software, leaks and the rear sensor |
| Rear switching like the front | Converter failed, or isn't lighting off because of an engine problem |
| Rear slow or stuck when you force rich and lean | Sensor, heater or wiring fault |
| One bank lean, the other rich | Fuel control problem upstream |
| P0420 and P0430 together | A shared cause such as software, fuel control or coolant |
| Low HC and CO with high NOx on a five-gas test | Typically not a bad converter |
Patterns from Vehicle Service Pros, Underhood Service and Identifix. Each needs a test to confirm it.
Know your sensor type first
Don't judge a wideband air-fuel sensor by the classic switching pattern. Identifix lists using a universal waveform rule without identifying the sensor type as a common mistake.
Check for Carmaker Bulletins Before Buying a Converter
Several carmakers have published P0430 bulletins, and most begin with a software update rather than a converter.
| Maker and bulletin | Vehicles | Fix described |
|---|---|---|
| Ford 25-2233 | 2022 to 2023 F-150 3.5L PowerBoost | PCM and module updates, then a converter only if its Mode 6 oxygen storage value stays above 0.4 |
| Ford 25-2348 | 2022 F-53 and F-59, 2023 F-650/F-750 and E-Series, 7.3L | PCM update for an incorrectly lit light with P0128, P0420 or P0430 |
| Chrysler 18-089-24 | 2019 Chrysler 300, 5.7L HEMI | PCM update for P0420, P0430 or P0456 |
| Volkswagen 2044303 | 2012 Passat 3.6L | ECM update to avoid unnecessary catalyst replacement |
| Audi 2038434/1 | 2007 to 2011 Q7 3.6 FSI | ECM software update |
| Infiniti ITB13-053a | 2011 to 2012 QX56 | ECM update if needed; for P0430, new Bank 2 manifold, catalyst and A/F sensor |
| Lexus L-SB-0127-11 Rev2 | 2010 to 2011 RX 450h, listed VINs | New Bank 2 Sensor 2 oxygen sensor if it fails a voltage or impedance check |
From each maker's bulletin as filed with NHTSA. Each applies only to the listed vehicles and VINs, so ask a dealer to confirm yours.
Ford's F-150 bulletin 25-2233 shows how the test is graded. After the updates and drive cycles, the repair is complete only if the Mode 6 oxygen storage value has dropped and sits below 0.4 on the affected bank. Ford allows up to 3.1 hours for the diagnosis, updates and drive cycles, eligible under its New Vehicle Limited Warranty or emissions warranty.
Chrysler's bulletin 18-089-24 blames PCM software and lists just 0.2 hours of labor for the reflash, reimbursable within the warranty. Volkswagen's Passat bulletin goes further and tells technicians not to diagnose or replace any parts before performing the update.
NHTSA's recall lookup lists recalls, investigations, complaints and manufacturer communications by year, make and model. A VIN search shows whether your own vehicle needs a recall repair.
How to Fix P0430 and What Each Repair Costs
Fix what the tests prove, cheapest first. An oxygen sensor or exhaust gasket runs a few hundred dollars, while a converter usually tops $1,000.
| Repair | RepairPal estimate | Other published figure |
|---|---|---|
| Check engine light diagnosis | $125 to $183 | Not listed |
| Oxygen sensor | $440 to $523 | CarMD: $286.87 |
| Exhaust manifold gasket | $417 to $596 | Not listed |
| Ignition coils and spark plugs | Not listed | CarMD: $480.21 |
| Catalytic converter | $2,280 to $2,480 | CarMD: $1,510.88. AAA: $1,000 to $4,000 |
| Head gasket | $2,572 to $3,386 | Not listed |
RepairPal national estimates for parts and labor, updated September 3, 2026, before taxes and fees. CarMD averages for 2025 U.S. repairs from its 2026 Vehicle Health Index. AAA range from its catalytic converter cost guide.
RepairPal's converter estimate splits that into $2,044 to $2,133 for parts and just $236 to $347 for labor. It warns that many vehicles have more than one converter, so make sure the correct one is diagnosed and replaced. RepairPal also recommends high-quality OEM oxygen sensors, since cheaper ones may not be recognized by the car's computer.
AAA's catalytic converter cost guide puts parts alone at $300 to $2,500 and says OEM converters cost 40 to 70 percent more than aftermarket ones. It adds that CARB-compliant converters contain more precious metals and cost more.
Labor is the other variable. AAA's 2026 labor rate guide says most mechanics charge $120 to $159 an hour, and dealers often charge 25 percent or more above independents.
Bottled converter cleaners and fuel additives are tempting, but treat their claims with care. The EPA says additive registration doesn't require any proof that a product's claims are valid, and the agency doesn't certify, approve or endorse the additives it evaluates.
Free tool
Repair Cost Estimator. Enter the parts price, labor hours and shop rate from a quote, pick catalytic converter or oxygen sensor to compare, and see the total, the parts-only DIY cost and the national average.
Run any quote through our Repair Cost Estimator to see how much of the bill is labor before you approve the work.
Check the federal emissions warranty first
A converter that fails within 8 years or 80,000 miles may cost you nothing. The EPA's emissions warranty FAQ says catalytic converters, the emissions computer and the OBD system are the only parts with that coverage, which starts at the original sale and applies to used vehicles.
The EPA says makers can deny claims caused by improper use or maintenance, and you must use a manufacturer-authorized facility. Other emission-related parts get 2 years or 24,000 miles, and RepairPal notes the original cause of a converter failure usually isn't covered. The rule is 40 CFR 85.2103 on eCFR.
In California, the CARB OBD II fact sheet says OBD-detected problems are covered for 3 years or 50,000 miles, and parts that cost more than about $600 for 7 years or 70,000 miles.
Which replacement converters are legal
The EPA's aftermarket converter fact sheet allows an aftermarket converter only if the original is missing, an inspection finds it damaged or poisoned, or a 1995 or newer car is past 8 years or 80,000 miles with a documented need. It can't replace a converter still under warranty or recall, and it must match the original type and location and carry a 5-year or 50,000-mile shell warranty plus 25,000 miles on emission performance.
CARB's fact sheet says dealer converters and CARB-approved aftermarket ones are legal in California, if the approval covers your vehicle. Colorado's converter rules have required an OEM or new CARB-certified converter since Jan. 1, 2021, ban used ones, and allow aftermarket converters only after the emissions warranty ends.
New York's DEC has banned federal aftermarket converters since Jan. 1, 2023, on CARB or 50-state certified vehicles from model year 1993 on, except 1995, so those cars need a CARB-approved or OEM converter. The emission control information label in the engine bay shows your car's certification.
Theft and the price of a converter
The precious metals that make converters costly also make them a target, and AAA names platinum, palladium and rhodium. The NICB's May 2023 theft report counted 64,701 theft claims in 2022, up from 16,660 in 2020, and put replacing a stolen converter at $1,000 to $3,500 or more.
Why Do P0420 and P0430 Show Up Together?
Two converter codes at once usually point to one cause that reaches both banks, such as software, fuel control, misfires or a coolant leak. Six of the seven bulletins above cover both codes, and each includes an engine software check or update.
Be wary of a quote for two new converters before the cause is proven. RepairPal lists replacing a converter when the real problem is internal engine damage or a misfire among the common misdiagnoses. Our P0420 code guide covers the Bank 1 side, so the two guides together cover a V engine with both codes.
After the Repair: Clearing P0430 and Passing Inspection
Clear the code with a scan tool, then drive normally until the catalyst monitor runs again. Identifix says the code closes when the monitor runs and passes, not when the screen clears.
The New York DMV's readiness guide says cleared codes and a disconnected battery leave monitors not ready, usually for two drive cycles separated by a cool-down. CARB says Smog Check for 2000 and newer cars is mainly an OBD II inspection, and owners should drive normally for about a week to set readiness.
Codes Related to P0430
Companion codes often explain why the Bank 2 converter failed its test.
| Code | Meaning | What it tells you |
|---|---|---|
| P0420 | Catalyst System Efficiency Below Threshold (Bank 1) | Same test on Bank 1 |
| P0174 | System Too Lean (Bank 2) | A Bank 2 mixture fault to fix first |
| P0175 | System Too Rich (Bank 2) | Excess fuel can overheat the converter |
| P0300 | Random/Multiple Cylinder Misfire Detected | Fix the misfire first |
| P0157 | O2 Sensor Circuit Low Voltage (Bank 2, Sensor 2) | Rear sensor or its circuit |
| P0155 | O2 Sensor Heater Circuit (Bank 2, Sensor 1) | Front sensor heater fault |
| P0161 | O2 Sensor Heater Circuit Malfunction (Bank 2, Sensor 2) | Rear sensor heater fault |
Code names from the Chrysler bulletin, OBDeleven, Edmunds and Kelley Blue Book. Notes from Vehicle Service Pros, CarMD and the bulletins above.
Treat P0430 as a question, not a verdict. Compare the Bank 2 sensors, check for leaks and bulletins, and confirm the warranty date before paying for a converter that might still be covered.
Frequently Asked Questions
Is P0430 more serious than P0420?
No. Both codes report the same catalyst efficiency test, P0420 for Bank 1 and P0430 for Bank 2, as the Chrysler and Audi bulletins define them. Neither bank matters more, and the likely causes are the same. How urgent it is depends on how the engine runs and whether the light is steady or flashing, not on which bank set the code.
Do you have to replace both catalytic converters for P0430?
Not usually. P0430 only judges the Bank 2 converter, and Ford's F-150 PowerBoost bulletin replaces only the converter on a bank whose oxygen storage value stays above its limit. RepairPal warns that many vehicles have more than one converter, so the shop should confirm which one failed. If P0420 is stored too, find the shared cause before replacing both.
Will a P0430 code clear itself?
Only if the converter passes its self-test again. Identifix says the code closes when the catalyst monitor runs and passes, not when the scan tool screen clears, and Auto Barn's answer to the same question is a flat no. A worn converter will fail the test again, and clearing the code yourself also resets the readiness monitors needed for inspection.
Can you pass an emissions test with a P0430 code?
Not in a program that reads the car's computer. Auto Barn says P0430 will cause a failed emissions or smog test, and CARB says the faulty component must be repaired before a car can pass California's Smog Check. Fix it early, then drive normally so the readiness monitors finish. New York allows only one monitor to be not ready on 2001 and newer cars.
Can bad gas or the wrong fuel cause a P0430 code?
It can contribute. Identifix lists the wrong fuel type among the causes of catalyst efficiency codes, and OBDeleven includes it in its P0430 causes. The Ram owner's manual notes that poor-quality fuel can turn on the check engine light. Use the fuel your owner's manual specifies, fix any misfire codes, and let the catalyst monitor run again before you buy parts.
Can a clogged Bank 2 converter damage the engine?
It can if you ignore it. AutoZone warns that a clogged converter can back up the engine and damage other components. Vehicle Service Pros says sluggish response or low power may point to an exhaust restriction from a melted or broken substrate, and RepairPal says a back-pressure test can check for a clog. Have a converter that rattles or chokes the engine checked promptly.
Sources and References
- Edmunds. P0430: Catalyst System Efficiency Below Threshold (Bank 2)
- Vehicle Service Pros. The Real Cause of P0420/P0430 DTCs
- Identifix. P0420 Code: The Guide to Diagnosis and Fast Fixes
- Kelley Blue Book. P0171 Code: Fuel Trim System Too Lean (Bank 1)
- Kelley Blue Book. P0155 Code: O2 Sensor Heater Circuit - Bank 2 Sensor 1
- OBDeleven. P0430: Catalyst System Low Efficiency (Bank 2)
- OBDeleven. P0174: Fuel Trim. System Too Lean (Bank 2)
- AutoZone. Diagnostic Code P0430: Catalyst System Efficiency Below Threshold (Bank 2)
- Auto Barn. P0430: Catalyst System Efficiency Below Threshold (Bank 2)
- Underhood Service. Oxygen Sensor: Catalyst Efficiency
- Underhood Service. Monitoring Emission Efficiency With O2 Sensors
- AAA. The Check Engine Light: Common Causes and How To Fix It
- AAA. How Much Does a Catalytic Converter Cost
- AAA. Average Mechanic Labor Rate: Repair Costs in Your State 2026
- RepairPal. P0430 OBD-II: Catalyst System Efficiency Below Threshold
- RepairPal. Catalytic Converter Replacement Cost Estimate
- RepairPal. Oxygen Sensor Replacement Cost Estimate
- RepairPal. Check Engine Light Diagnosis & Testing Cost Estimate
- RepairPal. Exhaust Manifold Gasket Replacement Cost Estimate
- RepairPal. Head Gasket Replacement Cost Estimate
- CarMD. 2026 CarMD Vehicle Health Index
- Mopar (Ram). 2022 Ram 2500/3500 Owner's Manual: Engine Check/Malfunction Indicator Warning Light (MIL)
- U.S. EPA, Office of Transportation and Air Quality. Do You Drive a 1996 or Newer Car or Light Truck? (OBD fact sheet)
- U.S. EPA. Frequent Questions related to Transportation, Air Pollution, and Climate Change
- U.S. EPA. What You Should Know About Using, Installing, or Buying Aftermarket Catalytic Converters (EPA-420-F-00-101)
- eCFR (National Archives). 40 CFR 85.2103: Emission Warranty
- California Air Resources Board. On-Board Diagnostic II (OBD II) Systems Fact Sheet
- Colorado Department of Public Health and Environment. Aftermarket Catalytic Converters
- New York State DEC. Controlling Air Pollution From Motor Vehicles
- National Insurance Crime Bureau. Catalytic Converter Thefts Surge Nationwide, According To New Report
- New York State DMV. What Do You Mean My Car's Not Ready?
- NHTSA. Check for Recalls: Vehicle, Car Seat, Tire, Equipment
- Ford Motor Company (via NHTSA). TSB 25-2233: Illuminated MIL With DTC P0420 And/Or P0430 Stored In The PCM
- Ford Motor Company (via NHTSA). TSB 25-2348: Incorrectly Illuminated MIL With DTC P0128, P0420, And/Or P0430
- FCA US (via NHTSA). TSB 18-089-24: Flash: Powertrain Control Module (PCM) Updates
- Volkswagen Group of America (via NHTSA). Technical Bulletin 2044303: Update Programming, MIL ON, DTCs P0420 and or P0430 Stored in ECM Fault Memory
- Audi of America (via NHTSA). Technical Service Bulletin 2038434/1: MIL On (DTC P0420 and/or P0430 in ECM)
- Infiniti (via NHTSA). ITB13-053a: 2011-2012 QX56; MIL ON With DTC P0420 and/or P0430
- Lexus (via NHTSA). L-SB-0127-11 Rev2: MIL ON DTC P0430
- American Honda, Acura (via NHTSA). Service Bulletin 17-019: MIL Comes On With DTC P0430
- Edmunds. P0175: System Too Rich (Bank 2)
- Edmunds. P0157: O2 Sensor Circuit Low Voltage (Bank 2, Sensor 2)
- Edmunds. P0161: Oxygen Sensor Heater Circuit Malfunction (Bank 2, Sensor 2)
- Edmunds. P0300: Random/Multiple Cylinder Misfire Detected
Written by
CarTipsMentor Team
Researched from the sources listed above and checked against them before publishing. Nobody paid to be mentioned on this page. It is general information, not advice about your own vehicle.
Published . Last updated .
