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2010 Audi A4 2.0t P...
 
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2010 Audi A4 2.0t P0420 code

  

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Scotty Once I check the pressure or exhaust coming out of the oil cap on top of engine, and I notice the engine started to fluctuate on idle to the point it wanted to stall on me so I tightly replace oil cap and idling went back to normal, is this having to do with the engine code P0420? let me know Thanks

Jose C El Paso TX.


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That would be a seperate problem from that code. The code indicates an issue with the catalytic converter. 


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