I have a AUdi A6 1999(69K miles) Enginelight on with a P0411 code and lately when i start the car in cold mornings the high temp light is on but after say five mins when the car is running the light is off and doesnt come on again rest f the day...are these 2 codes related...i really dont want to take this to a audi stealership without knowing much abt the problem...GUYS plz help!!!
P0411 audi a6
Oct 01, 2007
1 Replies
**P0411 035 Secondary air flow system through-flow defective
The most likely cause is a broken hose going to a silver secondary air combination valve located behind the top center of the engine. Check both hoses and expecially on the bottom side. Replace if there is any sign of problem. The combi valve itself may also be the cause.
It could also be due to one of several vacuum check valves.
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