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I bought this Audi A4 Quattro 5 speed turbo.

Tiny
J. CAMACHO
  • MEMBER
  • 1998 AUDI A4
  • 140,700 MILES
I bought this Audi a4 quattro 5 speed turbo, its a very clean car inside out, I would say 9 out of 10. Runs great strong engine, nice steady when at idle, problem is it did not pass emmissions. Its says HIGH HC readings, HIGH CO readinds, HIGH NOx readings. No diagnostic trouble codes. What can it be?
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Saturday, February 9th, 2013 AT 8:50 PM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
I would start with a set of plugs. I would have the injectors professionally serviced. Make sure the filters are clean.
Have an upper engine cleaning done to get rid of all carbon in the cylinders. Lastly, change the oil/filter

Roy
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Saturday, February 9th, 2013 AT 9:20 PM

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