Audi
A4 Quattro
8

Maintain fuel quality to avoid misfires and CEL illumination on Audi A4 Quattro

Problem Description and Possible Solution

Fuel quality must be maintained to avoid engine misfire problems; the misfires may cause the Check Engine Light to illuminate.

Problem Data
RepairPal Verified
Average mileage: 68,796 (66,000–71,592)
Engines affected: 1.8L 4 Cylinder Turbo, 3.0L V6
5 model years affected: 2002, 2003, 2004, 2005, more2006
8 people reported this problem
Comments
Viewing 1 - 2 of 2 comments
I put a lower grade gasoline in the engine after purchasing the pre-owed car and not knowing of the fuel requirements. Check engine light illuminated several times while operating on lower grade fuel ('89). Engine also rumbled when near idle or in neutral. Drove until tank emptied, replaced tank with proper grade fuel and problem went away.
Check engine light was on and vehicle ran rough.