Audi Code P0420
2001 audi code p0420 catalyst sysytem effiecincy below threshold bank 1 Hi all. mk6 golf 1.6 tdi. which one is egr valve? top or bottom? i have Code ford po420 efficiency catalyst system p0420 audi fault threshold below trouble focus
hi all. mk6 golf 1.6 tdi. which one is egr valve? top or bottom? I have
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P0420 audi trouble code – catalyst system efficiency below threshold
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What to do with a p0420 code .
