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Does anyone know what the narrow small oil cooler under the front bumper at the bottom cools?have a leak from the passenger side found a diagram online can see the o ring(number 7)that needs replaced but cannot find a part number. Any help would be appreciated.

Been for a good drive and gave it a bit of a thrashing nothing has come back up so hopefully it stays that way for the drive back home in a week take it to the garage I got it from then they can sort it.

Update....decided to have a look myself...opened air box...checked vac hoses...removed sensor cables fiddled around....was still up...disconnected the battery left for 30 mins...reconnected turned throttle to on position but did not ignite to try reset throttle body position. Car fired up EPC light ...

What is the SC hose?where is that located?will be taking it for a diagnostic in next couple of days also.

Possibly could have been a failing sensor first time around and has fully gone now?First thoughts were MAF as have had this on other cars before so not too much to worry about. Cheers for the help will get a diagnostic this week and hopefully sorted!

The misfire was sorted filled car with 99 octane and has not misfired since so must have been that fuel. Was running like a dream even this morning then that happened just standing still. Looks like a trip to the garage in the week then ha!

Was sitting at traffic lights this morning and the EPC and traction control lights came on and stayed on. Restarting the car they were still on. Car is now in limp mode and have a 400 mile drive in a weeks time. Any idea what this could be?The engine was de-coked in January so have ruled this out.

Recently purchased a 2007 RS4 B7. Car is amazing and ran well on the test drives etc. Filled the car up with normal unleaded not concentrating and after quarter of a tank the car has started misfiring and hesitate in the low rev ranged until warmed up. The car has an APR stage 1 remap so guessing th...