Audi Code P0420
Hi all. mk6 golf 1.6 tdi. which one is egr valve? top or bottom? i have P0401 audi code egr issues sport may xf P0726 code: engine speed input circuit range / performance
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P0420 audi trouble code – catalyst system efficiency below threshold .
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![hi all. mk6 golf 1.6 tdi. which one is egr valve? top or bottom? I have](https://i2.wp.com/preview.redd.it/hi-all-mk6-golf-1-6-tdi-which-one-is-egr-valve-top-or-v0-3fgmjgp3k2p91.jpg?auto=webp&s=d0a168b2bf3278c35bd30cb18da280d1af03ae1b)