i had a ? i just purchased a 2000 si off one of my buddies, i was driving all day yesterday and the check engine light came on. i called him up and he said if vtec still works than its probaly a o2 sensor, is this true or could there b something mech. wrong with the motor.
Ask them to write down the codes for you, so you can research them more. I've witnessed a few times where they have told customers what parts to get, but never what the code was.
no it diff has a cat and secondary o2 sensor i mean the vtec is still popping so idk know maybe the sensor went bad. it does have ctr pistons and ctr inake cam,that were just installed about a months ago but i dont see why it would throw a cel light now. ive been driving it for a month now. any ideas
o2's go bad. and more so, the 2ndary is a checker o2... it takes the pre-cat reading and expects it to be X cleaner after the cat.
if it's not, it will throw a code.
when you got into modding heavily, it puts out more exhaust than it expects.
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