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I have a 2005 CTS Cadillac with engine came is read p0420 and p0430. What does mean and much will cost me to repair. To recommed any shop in the zip code 78260. Please advice. Thanks, Pete Graham

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6 Suggested Answers

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  • 2 Answers

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Posted on Jan 02, 2017

SOURCE: P0420 and P0430

I have a P0420 code and it seems to be the cat needs replacing.

Posted on Jun 05, 2008

motor1258
  • 6674 Answers

SOURCE: 1999 cougar diagnostic code p0430 and p0420

Failed or faulty oxygen sensor, or faulty catalytic converter. It's actually the oxygen sensor reading that the catalytic converter is not functioning properly & needs relacement. That's provided the oxygen sensor is not faulty, which personally, I'd go for that first.
Both would explain excessive fuel usage.

Posted on Jan 25, 2009

  • 104 Answers

SOURCE: code p0430 p0420

there is a update for the engine computer if you take it in to your toyota dealer they can do it for you. there is a campaign on this issue so its free of charge

Posted on Apr 27, 2009

  • 102 Answers

SOURCE: P0420 & P0430 codes 99 silverado

codes p0420 and p0430 are both post o2 sensors, the ones after the convertor, both sides if replacing

Posted on May 18, 2009

bschilz
  • 2049 Answers

SOURCE: check engine light-on OBD code's P0420 &

The codes are Catalyst System Efficiency Below Threshold (Bank 1)&(Bank 2).

The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream O2 sensor reading should be fairly steady. Typically the P0420 code triggers the Check Engine light if the readings of the two sensors are similar. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.

A code P0420 may mean that one or more of the following has happened:

  • Leaded fuel was used where unleaded was called for
  • An oxygen sensor is not reading (functioning) properly
  • The engine coolant temperature sensor is not working properly
  • Damaged or leaking exhaust manifold / catalytic converter / exhaust pipe
  • Retarded spark timing
  • The oxygen sensors in front and behind the converter are reporting too similar of readings
Some suggested steps for troubleshooting a P0420 code include:
  • Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required.
  • Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady).
  • Inspect the downstream heated oxygen sensor (HO2), replace if necessary
  • Replace the catalytic converter
One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem.

Posted on Oct 06, 2009

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My 2004 dodge ram randomly hesitates while accelerating


P0420 & P0430 are catayltic coverter codes ! P0440 Evaporative Emission Control System Malfunction P0700 Transmission Control System Malfunction
P0760 = Shift Solenoid C Malfunction

Read more at: http://www.obd-codes.com/forums/viewtopic.php?t=10525
Copyright OBD-Codes.com
Read more at: http://www.obd-codes.com/p0700
Copyright OBD-Codes.com

Read more at: http://www.obd-codes.com/p0440
Copyright OBD-Codes.com

http://www.obd-codes.com/p0420 http://www.obd-codes.com/p0430 http://www.obd-codes.com/p0440 Sounds to me like you have some major problems and need to take your vehicle to a qualified repair shop .

Nov 26, 2016 | 2004 Dodge Ram

Tip

I get OBD codes P0420 and P0430



P0420 and P0430

P0420 means Catalyst System Efficiency Below Threshold, Bank 1

P0430 means Catalyst System Efficiency Below Threshold, Bank 2

It means that the O2 sensors are good, and the O2 sensors are telling you that your catalytic converter, in the exhaust system is not working fine, as its emissions are polluting the air too much.

The catalytic converter is part of the exhaust system. The way to test this part is by doing an emission test. The two OBD codes that you are getting are already a test telling you that the converter must be replaced, unless an emission test done at a garage says the opposite.

This kind of problem will trigger the check engine light, and your car will also waste too much fuel.
You also risk to get in trouble if the car goes through an Air Pollution control, as the car won't pass an emission test in this condition.

To conclude, the Catalyst System must be replaced, the O2 Sensors are fine.

This is a repair that should be done at a garage, however you can find DIY instructions here:How to Replace a Catalytic Converter or you can get more detailed instructions, and step by step illustrated procedure purchasing a repair manual.

on May 27, 2009 | 2003 Chrysler 300M

1 Answer

WHAT ARE CODES PO330 AND PO320 CTS 2006 CADILAC


I use this website all the time:
https://www.obd-codes.com/p0320
https://www.obd-codes.com/p0330
https://www.obd-codes.com/p0420
https://www.obd-codes.com/p0430

Now the art is knowing how to interpret, the P0320 and P0330 can set off your P0420 and P0430 oxygen sensor codes. I would address the P0320 and P0330 first and probably the O2 sensor stuff will probably go away. If your car is knocking, rough idle, loses power, etc. then the 300 codes make sense and you have issues. It could also be two separate issues were damaged wiring on the knock sensors and then a damaged catalytic converter. I've got a car that constantly throws up 420 and 430 codes because the catalytic converter got dinged up from running something other.

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1 Answer

Volkswagen touareg 2005, V6, 3.2L error code P0420, P0430 and P0068


Hi. Please concentrate on fixing p0068. this is to do with airflow and fuel/ mixture. maybe air mass meter. these can cause faults p0420 and 0430 to come on. after p0068 is repaired clear all faults and take the car on a long drive to clean out the cats, reassess if the cats are actually faulty at a later date.

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Hi there:
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this TSB:
Condition/Concern:
Some customers may comment of check engine light with DTC of P0420 or P0430. DTC P2096 may also be present.
Recommendations/Instructions:
The cause may be a hole in the weld of post catalyst O2 sensor boss on the exhaust pipe which allows outside air into the pipe at the O2 sensor and skews the post catalyst O2 sensor reading. The hole may or may not be readily visible, depending on its position. If a hole is found, it may be repaired by welding it shut. If a hole is found on a 2006 model year vehicle, please contact Dave Dickey at(NNN) NNN-NNNN

Pay attention that if you buy gas at a known good station, the code will go away. So, fuel quality does play a role in this. The chemical treatments are something that are new to me, but my parts salesman says he has heard good things from his customers about it.

Hope this helps.

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My 1999 Chev Tahoe will not start - Has codes p0430 and p0420


Hi Charlie,
Diagnostic Test Codes (DTCs) P0420 and P0430 ar "Catalyst Efficiency" codes. These simply mean that the catalytic converters in your vehicle are not performing the way they should be. To fix these codes, you will most likely have to replace the converters. However, these codes do NOT indicate why your engine wil not start. There are many things that can cause an engine to not start. Many of which may or may not set fault codes. You need to determine if the engine is getting fuel and ignition first then go from there.

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