nick1989

Hows it going fellow members?

I have a 2007 A6 4.2Q with ~135,000 miles

Recently, about 2 weeks ago, my epc, check engine and traction control light all came one when i started my car. Thinking this was probably a glitch i turned it off, let it sit for 5 mins and then started it again only to have the same thing happen again. Since i was at a parking lot in school i drove my car about 8 miles to my house which was the worst ride i have ever had. When i first put the car in drive the RPMs dropped drastically and the car started to shake, this continued throughout the drive punctuated with my car dying as soon as i stopped at any red light and then me having to start the car, right away rev it so the RPMs stayed up and then put it back in drive.

Since the car has been sitting for the past 2 weeks i have started it almost every single day only to have the initial RPMs go to 1500 and then drop back down to 600 and continue to dwindle as the car dies again.

I scanned it with a OBDII scanner and here is the list of codes (10 to be exact):

P0102 - Mass or Volume Air Flow Circ Low Input
P0300 - Random/Multiple Cylinder Misfire Detected
P0308 - Cyl.8 Misfire Detected
P0418 - Sec. Air Inj. Sys. Relay (A) Contr. Circ Malfunction
P0458 - EVAP System Purge Control Solenoid Low
P129B - ?
P2015 - Intake Manifold Runner Position Sensor/Switch Circuit Range/Performance Bank 1
P2020 - Intake Manifold Runner Position Sensor/Switch Circuit Range/Performance Bank 2
P2294 - Fuel Pressure Regulator 2 Control Circuit/Open
P2401 - Evaporative Emission System Leak Detection Pump Control Circuit Low

Here is a video of what happens when the car is first started.

View My Video

I have no idea what is going on with the car and i can not even drive it down the block much less take it to the dealership and have them diagnose it.

If anyone has had a similar experience or knows what the problem could be i would really appreciate some help/info.

eazy211187

After reading your posting you have the signs of vacuum leaks. Everything is pointing to that.

Your first thing to do is check for vacuum leaks. The diagram should be posted under the hood.

Check the front of the engine(remove 4.2 cover). That's the most common problem of a leak. You could oem or autopart hose(which is more durable for heat).

Once you find the leak and repaired. You could reset the faults or let them reset themselves meaning the car needs to cycle 10 time(not turn key but drive the car +1 mile).

Your EPC, traction are loosing pressure from the leaks that is setting off the Check Engine light.

jujuC6

eazy is right, look here.

https://www.audiworld.com/forums/sho....php?t=2762508

oaktreelimb

You may have multiple problems. Your main problem is not at the leaking vacuum line or manifold. I would check the MAF sensor and high pressure fuel pump circuits.

nick1989

I checked the vacuum lines they seem to be fine ... Is there a write up on how to check the MAF and Fuel pump?

mel_50108

did you ever figure out what the issue(s) was?? I have 2005 a6 Quattro and mine is doing exactly what yours is...took it to a shop they replaced 2 of the 3 fuel pumps and just replace some intake valve so its running again but same symptoms...shop guy stumped. my first audi first issues Ive had??? would love some guidance!!