2011 A8 4.2, intermittent P0420 code

   #21  

Jack@European_Parts

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Yeah and follow up .....reading out files or shadow reads to compare file consistency, is never going to stop detection unless by some shear method of dynamic writes.

Dynamic code routines virtually would be interesting wouldn't it?
 
   #22  

J2 auto

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hi so the fault code p420 bank 1 is the rear lambda sensor that is picking up the catalytic converter is not doing its job on bank 1 .
Ways to fix it
1 check lambda sensor
2 check catalytic converter have not been tamped with or burned out

would like to know what you found

jameel
 
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