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2008 Audi A6 - Page 5 Questions & Answers
CHECK ENGINE CODE: P0421
Def:
Boy you had better go back and read more about what a catalytic converter does, remember in chemistry a catalyst is a thing that facilitates a chemical reaction but is not directly involved in that reaction? Ring a bell.
I have an 2.4L Audi
if you have had all them parts changed and its binding one moment then not working correct. the possible problem can be the abs unit, when you apply the brakes the abs controls the pressure. if the vale in the abs unit is faulty you can get this problem and worse. you may not even get a code as the coil is still fine is just its stuck. i would have this part checked or replaced.
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