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What does trouble code P0420 and what are the most common causes

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P0420 Catalyst System Efficiency Below Threshold (Bank 1)
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VAS 5054A With OKI Chip

Posted on Apr 27, 2013

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Can catalytic converter cause a PO65O code


Pesky PO420 Codes - Eastern Catalytic

www.easterncatalytic.com/education/tech-tips/pesky-p0420-codes/
One of the most annoying is the persistent PO420 diagnostic code (Catalyst System ... not only shows its teeth when the catalytic converter is on the blink, but can also be ... Most, if not all, catalytic converter failures are caused by a problem or ...

P0420 Error Code: Catalyst System Efficiency Below ...

www.obd-codes.com/p0420
Repair information for the OBD-II trouble code P0420 - Catalyst System Efficiency ... If they have failed, it is likely due to something else that caused it to fail. ... the catalytic converter is broken or failed, it may be restricting the exhaust which will ...

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P0420


Hi Osar-
I pulled this link from ODB-codes.com. It lists the possible causes, diagnostics and resolution for engine code issues. Hope this helps!
P0420 OBD II Trouble Code

Apr 02, 2014 | 2004 Mazda 3

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P0420 code evap system


This is not an evap code. Read on:
P0420 - Catalyst System Efficiency Below Threshold Bank 1

Possible causes- Three way catalyst converter Bank 1
- Exhaust tube
- Intake air leaks
- Fuel injectors may be faulty
- Fuel injector leaks
- Spark plugs may be faulty
- Improper ignition timing
- Engine Control Module (ECM)
Tech notes The most common cause it the three way catalyst converter Bank 1. Changing just the O2 sensor usually don't repair the problem. If the P0420 code is combined with other codes, try fixing the other codes first.

Nov 02, 2012 | Cars & Trucks

2 Answers

What is wrong when this code shows up p0420 shows up..This is a 2006 nissan sentra


P0420 NISSAN - Catalytic Converter Efficiency Below Threshold Bank 1

The most common cause for the OBDII code P0420 on Nissan vehicles is the three way catalytic converter Bank 1 has reached the end of its useful life.. Since this is a very expensive part you need the code fully diagnosed as some other things like exhaust leaks or poor engine tune can cause it as well

Oct 05, 2012 | 2006 Nissan Sentra 1.8

3 Answers

Computer diagnosis P0420


P0420 SUBARU - Catalyst System Efficiency Below Thresholdxicon.jpghttp://engine-codes.com/p0420_subaru.htmlForum CodePossible causes- Three way catalyst converter Bank 1
- Exhaust tube
- Intake air leaks
- Fuel injectors may be faulty
- Fuel injector leaks
- Spark plugs may be faulty
- Improper ignition timing
- Engine Control Module (ECM) Tech notes The most common cause is the three way catalytic converter Bank 1 is worn out. Changing just the catalyst O2 sensor usually does not repair the problem. If the P0420 code is combined with other codes, try fixing the other codes first.

Aug 20, 2012 | 2002 Subaru Outback

2 Answers

Trouble code po420 2007 solstice


P0420 - Catalyst System Efficiency Below Threshold Bank 1xicon.jpghttp://engine-codes.com/p0420.htmlForum CodePossible causes- Three way catalyst converter Bank 1
- Exhaust tube
- Intake air leaks
- Fuel injectors may be faulty
- Fuel injector leaks
- Spark plugs may be faulty
- Improper ignition timing
- Engine Control Module (ECM) Tech notes The most common cause it the three way catalyst converter Bank 1. Changing just the O2 sensor usually don't repair the problem. If the P0420 code is combined with other codes, try fixing the other codes first.

Jul 06, 2012 | 2007 Pontiac Solstice Convertible

1 Answer

'01 chevy prism has the check engine light on, P0240 is the code


Hi Carla:
There are a number of things that could be causing this p0420 catalyst efficiency code. The most common thing is the catalytic converter itself is no longer functioning properly. The other likely thing is the rear O2 (oxygen) sensor is no longer working properly. Other things could include exhaust leaks, damaged exhaust pipes, damaged O2 sensor wiring/connectors, plugged catalytic converter, etc.

A P0420 code is a trouble code on OBD-II equipped vehicles. All vehicles from 1996-newer sold in North America support this generic powertrain code. This code is a pretty common one and this site is here to help the average do-it-yourself (DIY) car owner (like you) troubleshoot, diagnose, and fix their vehicle themselves when presented with a P0420 code, saving money.

If your car has multiple trouble codes (DTC's), it's always a good idea to fix them in the order they come up on the code reader. For example, if you have these codes - P0300, P0420, P0171, then you're going to want to tackle the P0300 Random Misfire code first (resolve it), and then tackle the P0420 code, etc. The reason for that is that the first code could be causing further DTCs to be set.

If you've come to this site you most likely already know that you have a P0420 code. To start, we strongly recommend you seek the services of a professional mechanic/technician if you have any doubts as to whether you can perform the repair.

Possible Solutions: Some suggested steps for troubleshooting a P0420 error 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. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Sep 26, 2011 | 2001 Chevrolet Prizm

2 Answers

1997 4Runner failed inspection. The trouble code reported: P0420 Catalyst System Efficiency Below Threshold (Bank1).


you will need to change the catalitic converters. Very common issue and if at all possible do not use after market cats. They will likely cause the same code and cause it to fail inspection.

Dec 27, 2010 | 1999 Toyota 4Runner

1 Answer

My 2002 Ford Escape is poping up code p0420 and p1507 what is it?


Repair information for the OBD-II trouble code P0420 - Catalyst System Efficiency Below Threshold (Bank 1)

Answer P1507 means "Idle Air Control Underspeed Error". It can be most commonly caused by a vacuum leak, a damaged Idle Air Control (IAC) assembly or a stuck IAC valve that ...

Aug 17, 2010 | 2002 Ford Escape

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