p0421, yay (specific question)
04-09-2011, 07:59 PM
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Audiworld Junior Member
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My p0421 code is gone i bought the car last week and i was low on gas i fill the tank with 87 grade gas and after driving for some time the cel came on and it was p0421 i read here the some times you get this code because you use cheap gas so i change to premium gas and today the code clear it self i am never using 87 grade gas anymore i hope it doesn't come back. Using better gas worked for me i don't know if it would for any of you. I found a lot of information here in this website about that code.
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