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check engine light ...help
Thread Starter
Teching In
Joined: Feb 2007
Posts: 32
Likes: 0
From: concord
check engine light ...help my light is on i scanned it and the code was p0420 so i changed the oxygen sesor and the went away for a day but then came back on agian and i dont know what it is ....can it be my cat on the driver side ???
thanks
thanks
12 Second Club
Joined: Apr 2002
Posts: 680
Likes: 0
From: Cave Creek, AZ- Canada Also.
CAUSES:
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
POSSIBLE SOLUTIONS
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. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.
For my 2001 Camaro it needed a new CAT cost me just under $500 intstalled
so i'm almost certian thats what you need
Registered User
Joined: May 2008
Posts: 47
Likes: 0
From: Sandston, VA
I got a letter from GM stating that they would extend the warranty on cats in multiple vehicles. Might be worth looking into to save some coin.....or just take em off and put on an ORY (off road y pipe).
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