Diagnosis codes, 05 B7 2.0TFSIQ

[grr]

The check engine light on my 05 B7 2.TFSI Q came on a couple of weeks ago. I had the dealer do a diagnosis on it. They found a few codes concerning fuel pressure, deleted them and wasn't able to recall the faults. However a couple of days later the light came on again. After I filled up the tank the light disappeared, but came back on halfway through the same tank, and it's stayed on for a few days now. I had a local shop do a diagnosis this morning, and they gave me the following trouble codes:

P0507 Idle Control System RPM higher Than Expected
P0441 Evaporative Emission Control System Incorrect Purge flow
P310B Low Pressure Fuel regulation: Fuel Pressure Outside Specification
P2187 System Too Lean at Idle, Bank 1

The car feels normal. Any ideas?

[grr]

The check engine light came back on today.

[grr]

Did a new read out yesteday, with a system that gives a bit more information.


Fault code Description Status
----------------------------------------------------------------------------------------------------------
08583 --- Bank 1; System too Lean at Idle --------------------------------------------- 004 No Signal/Communication
08825 --- Leak in Air Intake System ----------------------------------------------------- 002 Lower Limit Exceeded
12555 --- Low Pressure Fuel regulation: Fuel Pressure Outside Specification -- 008 Implausible Signal
01287 --- Idle Control System RPM: Higher than Expected. ------------------------- 001 Upeer Limit Exceeded

It looks to me as the first error is due to some sensor or something being dead/not connected, and the other three errors are just a consequence of the first error.

1. I'm used to splitting a V-engine in bank 1 and 2, but since this is an R4, does Bank 1 mean cyl 1 an 2 (starting at the front)?

2. What does "No signal/communication" on the first error mean? Are we talking lambda sensor? Coils? Other sensors?

[Alan02]

Check the Air intake leak first,as it can put other faults up too.Check all Induction hoses,manifolds etc.

[shark_90]

Bank 1 refers to all 4 cylinders, there is no bank 2 but the fault code has to state which bank the fault is on.

You definitely need to solve whatever the air leak is as that would likely cause your lean running condition and possibly the idle control problem too.

[grr]

Thanks guys. I had my car at LongLife service yesterday, and they also booked half a day to look at the engine lamp problem. They did a lot of readouts/printouts (laarge bunch of papers), and found out that the engine didn't get the air it needed, which fooled the ECU into believing there were other problems with the engine. They opened the air box and concluded that the air filter was so clogged up the engine didn't manage to suck through enough air at idle. They had never seen anything like it, and wondered where I'd been driving..

Well, they replaced it and did a new readout on the air mass meter, and everything apparantly looked good. They're certain this was the problem. I am not as the lamp has been off for a couple of days everytime I've zeroed the faults, but time will show. So far so good. Fingers crossed.

[Alan02]

It just shows you,check the simple things first,before you go to get your VAG COM.!!!! It aint always electrical. Hope its finally fixed though!

[grr]

It isn't.

As expected; The light came back on the day after (thursday) ironically enough just when passing by the dealer on my way home from work!

They're taking it back in tomorrow.

[shark_90]

The error codes mention too lean at idle - that's an excess of air! I would suggest that it's a leak in a vacuum pipe somewhere. Once you've solved that then you have a better chance of solving the others.

[grr]

I took a short look under the hood the other day, and wooha, it isn't easy to get an overview of the pipes/hoses on the turbo motor in the tight little engine bay. I've done my share of repairs and builds the past ten years, but that didn't help me. I am still confused...