Question about 2001 Honda Prelude

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Honda Prelude 2001, 2 codes seem to pop up all the time, P0420 and P0301. What has the to do with the other? Can the Catalytic converter cause a miss fire?

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Hello: Sir, the 301 is telling you that you have a mis-fire on cylinder #3, You may have a bad spark plug, or bad wire going to #3 plug or you may have a ignition unit that is not firing #3 cylinder, With the #3 cylinder not firing it caused the 420 code that means the catalytic converter to be below acceptable efficiency for emission standards. Repair the 301 before you replace the converter

Posted on Dec 28, 2010

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Posted on Jan 02, 2017

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PO420 code for CR-V Honda 2002


p0420 is a catalytic converter efficiency code. It sets when thecm determines that the catalytic converter is no longer doing its job. The usual fix is to replace the catalytic converter. An O.E. or an aftermarket direct fit converter from a reputable manufacturer is your best bet. Lesser quality brands will leave your pocket book lighter to start but will cause more problems than they solve.

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1 Answer

Honda civic 1998 EX check engine light on codes p300 p0301 p302 p303 p304


I don't think it is your catalytic converter because your light usually flashes and a bad cat I never heard of them causing a misfire. I ran your other code it is for a faulty EGR system. Exhaust gas recirculation excessive. You are getting too much exhaust gas back in the system. This will cause your misfire. Go-to a trusted mechanic and have them check out your EGR system.

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My engine light is on so i took an OBD reading and it showed the error codes P0401, P0420 and P0133. What do I need to fix?


P0401 is EGR valve, low circulation detected.
P0420 Catalyst system.
P0133 is O2 sensor bank 1 sensor 1.
All these codes are emissions related, so i would start with the EGR valve, it's probably clogged with carbon. The catalytic converter could be also, check that for excessive backpressure. The oxygen sensor can be tested, replace if needed. Good luck, i hope this helps.

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Getting OBD codes p0420 and p0430, how to fix these issue with my 2001 Audi A6


2001 Audi A6
EOBD code: P0420
Fault location: Catalytic converter system, bank 1 - efficiency below threshold
Probable cause: Catalytic converter, wiring, heated oxygen sensor 2 (downstream)

EOBD code: P0430
Fault location: Catalytic converter system, bank 2 - efficiency below threshold
Probable cause: Catalytic converter, wiring, heated oxygen sensor 2 (downstream)

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2 Answers

Engine code p0420


The P0420 code is set when the oxygen sensor after the catalytic converter gives a reading the same or very close to the reading of the oxygen sensor(s) before the catalytic converter.

There are usually three possible causes...
The front oxygen sensor (before the cat) is giving an incorrect reading.
The rear oxygen sensor (after the cat) is giving an incorrect reading.
The catalytic converter is not working properly.

Since you recently replaced the cat, the logic points to the sensors, but it could be the cat again. Aftermarket converters are usually smaller than OEM and don't last as long.

For a more thorough description of the code and troubleshooting visit
http://www.obd-codes.com/p0420

Our Subaru encountered this issue several years ago under warranty. The first time the dealer replaced the front oxygen sensor. This was the cheapest repair and since it was an intermittent problem I am sure they hoped to delay the issue until the warranty was up. The second time they replaced the catalytic converter and we haven't had any more issues.

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2 Answers

P0401,P 0420, CODE IN HONDA ODYSEY


P0401- Bad EGR valve
P0420- Most likely cause is a bad O2 sensor(s) at the catalytic converter

Sep 08, 2009 | 2001 Honda Accord

1 Answer

Code P0420 - what does that mean? The car is an


Code P0420 probable cause, 1. Secondary HO2S (Sensor 2) or 2.Three Way Catalytic converter.

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2 Answers

Trouble shooting P0420 code, bank 1, OBD II for 2000'?


misfiring can cause a P0420 code.
I would recommend a set of honda plug wires and plugs if the P0420 code returns.
I have used bolt in aftermarket bolt in catalytic converters but don't remember the brand name they fit ok and i have had 1 or 2 return with a P0420 code out of about 20. I have never replaced the oxygen sensor on a civic like yours.
I always fix the misfire problems, reset the computer, and have the customer drive it and see if the code p0420 returns. 50% don't have the P420 code return. drive it and see what happens and go from there.

Jan 06, 2009 | 2000 Honda Civic

1 Answer

Mauricio Vasquez


Here are some possible causes.

Air leaks at the exhaust manifold or in the exhaust pipes.
Catalytic converter damaged or has failed (deteriorated).
Front O2 Sensor older (aged) than the rear O2 Sensor (O2 is lazy).
Front O2 or rear O2 is contaminated with fuel or moisture.

Jul 18, 2008 | 2001 Honda Accord

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