OK, car back with me now. I did my best to recreate the conditions for the light to come on but (holds breath) it appears to be fixed. Engineer explained that they charged the turbo to diagnose it and that is independent of the egr valve so definitely needed replacing although he maf/map sensor probably didn't. They haven't charged me to replace sensor or egr valve so just the replacement turbo. I think I'll write to Audi UK about the turbo issue but the dealer has been pretty good in the way they've handled the whole thing.
Hello! I'm experiencing the exact same problem with an single turbo 2017 Audi A6, 2.0 TDI, 150.000 km on the odometer.
Idle mode (indicatet by a yellow flashing spiral on the display - that's the only signal that I recive), appearing totally random, mostly on highway (speds over 160 km/h) and only once at about 110 km/h, when throttling the car!
I recieved 2 fault codes on the testers so far:
- P0088 (fuel rail preasure - preasure to high)
- P0299 (alimentation preasure regulation - preassure under the regulation values)
(sorry for the texhincal expressions)
I went for a full technical/mechanical/electronic check on the TURBO and all parts related to it (even EGR, pipes etc.) and the result (from a specialised turbo service) was: TURBO totally OK !!
Another 2 services stated that TURBO needs changing, even on this no. of km (over 2500 euro)!!
Please tell what sensor exactly did you change on your car beside the EGR valve and if that finally solved the problem on your car?
And also, could you mention the type of your car (year, motor).
Thanks a lot and good luck!