Intermittant partial power loss on 2.0 TDI 170

**jakerade** · 20-07-2011,06:34 PM

I keep experiencing partial power loss on my car. Its like it loses 50+ Bhp in the middle of a journey for a short period of time and then returns to normal. Also feels like its running a bit rough and occasionally "coughts" at motorway speeds and also under acceleration.

The mobile tech has been out once after having engine management light on solidly for a day and the heater coil light flashing. He couldnt find any faults when he scanned the cars except ones relating to the hand brake which he cleared.

It recently had a DPF sensor replaced as well. Any thoughts from the techs out there? Sick to death of taking the car back and forwards to the dealer so want to be able to point them in the right direction.

Thanks

**Crasher** · 20-07-2011,11:35 PM

If the coil light was flashing it must have stored a code, get someone else to read them.

**a8 tech** · 21-07-2011,08:20 PM

sounds like passive regeneration also you need a fault code reader that can read uds protocol for 2008 onwards so vcds current release

post a code if possible or read dpf ash content and regen attempts/successful attempts

always ensure you have at least half a tank of fuel to regen the dpf

sudden loss of power can also be a sign the waste gate actuator sticking as this has become a common issue on the cr diesels or restriction in the egr

but as Crasher has mentioned scan with the current vcds beta version and post full fault code with ambient readings and ecu sw version plus advanced data for flash status so we can see if the recent dealer visit for the dpf sensor also incorporated sw update

**jakerade** · 21-07-2011,08:26 PM

Thanks - I have it booked in for next wednesday.

The mobile tech was the dealers Mobile guy and had the full audi gear although he did say there were more indepth tests that could be done in the workshop.

**jakerade** · 25-07-2011,12:12 PM

all the warning lights are back on today so perhaps that will help them diagnose it. At 50mph in sixth, foot to the floor and not a lot happens

**jakerade** · 28-07-2011,07:55 AM

Car returned with from dealer with heater coil flashing constantly and engine management light permanently lit. Apparently another exhaust gas sensor needs changing as the first one burnt out the second?

Getting beyond a joke now......

**Crasher** · 28-07-2011,09:49 AM

That is not good!

**jakerade** · 28-07-2011,09:52 AM

if its getting that hot, what else will it ruin? turbo & DPF?

Just writing a little note to Audi UK..

Cheers

**Crasher** · 28-07-2011,10:50 AM

There is a warning in the manual something along the lines of take car or the car will catch fire…

**jakerade** · 28-07-2011,10:52 AM

umm - thats not good. Anyway the dealer principle and audi UK have just recieved an email. I didnt see anything in the manual other than take to a dealer as soon as possible.