Car Problem Reports

Audi A4 Quattro Check Engine Light Due to Vacuum Leaks, Oxygen Sensor, or Catalytic Converter Fault

 
Audi A4 Quattro Problem
55 Reports
Me Too
Edit

Model Years Affected: 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006

Exhaust & Emissions Affected: 1.8L 4 Cylinder Turbo

Average Mileage: 120,532 mi (56,000 mi - 192,434 mi)

Verified

Vacuum leaks, oxygen sensor failure, and catalytic converter efficiency faults can cause the Check Engine Light to illuminate.

  • Visitor, , 110,000 mi

    I have had my check engine light on for last month. The mechanic at the shop put the computer on it and it says bank 1 lean and mis fire on pistons or something like that? The car runs fine but ideals rough.

    Flag This
  • Visitor, , 75,000 mi

    Vacuum leaks indicated by codes. Dealer and outside mechanics used vapor sniffers to locate a problem but found nothing. After doing my own research, I tried replacing the N80 valve and the problem was fixed. A symptom of a bad N80 valve is that when fueling up the car, the engine will hesitate when starting because of the vapor backup in the failed N80 valve. A replacement can be found for around $25 and installs fairly easy.

    Flag This
  •  Rookie

    Replace vacuum hoses

    Flag This
  • Visitor, , 140,000 mi

    catalytic converter and left side blinkers

    Flag This
  • Visitor, , 151,000 mi

    Check engine light on. Went to Auto Zone to get a reading and the codes read that it can be a faulty turbo, catalytic converter or an air leak.

    Flag This
  • Visitor, , 92,000 mi

    check engine light came on - catalytic converter insuffiency - replaced converter and check engine light has come on again after 1,300 miles with new converter. Obd has to be read again. Vehicle seems to be running okay.

    Flag This
  •  Rookie

    The check engine light remains on. Replaced gas cap about 2 years ago. I have worn hose, that probably is leaking air. Not sure how to affect repair myself. The problem seems to be effecting my mileage performance now.

    Flag This
  • Visitor, , 140,000 mi

    My Audi has all the same problems.

    Flag This
  • Visitor, , 184,000 mi

    this problem has been an issue for 4 years and 80000 miles even audi couldn't figure it out and just reset computer and I drove to another local garage and they inspected and passed it

    Flag This
  • Visitor, , 106,000 mi

    No solution as of yet but my check engine light just came on today with the coolant light. The coolant has been refilled but the check engine light is still on.

    Flag This
+ See more reports
Ask a Question