I GET A P420 CODE WHEN THE CHECK ENGINE LIGHT COMES ON.
I CHANGED THE OIL AND IT WENT AWAY FOR SEVERAL MONTHS; THEN CAME BACK ON AGAIN. I LOOKED AT THE EXHAUST SYSTEM AND CAN NOT FIND A POST CONVERTER O2 SENSOR, BUT I AM TOLD THAT IT IS SUPPOSED TO HAVE ONE. ANY SUGGESTIONS?
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Have your dealer look up this service bulletin.
GROUP: Vehicle Performance
DATE: August 02, 2011
It states your PCM needs reprogrammed with the error code you are receiving P06DE. Was a pretty common problem back then.
it sounds like your oil pump is not working good. check oil pressure at cold and what weight oil are you using. it may be too heavy for it to get up to the top of the motor quick.if there was any build up in the head when you changed the lifters you may want to flush the oil system good then put fresh oil back in
If your check engine light comes on then it will definitely not pass.There is no such thing as a code that says your sensors are bad. I could help you out more if i had the codes.If your sensors were bad you would get a heater failure code.But then again it could be anything.You need that code.