Here is the code I am getting:

*************
17536 - *Fuel Trim; Bank 1 (Mult): System too Lean
* * * * * * P1128 - 001 - *Upper Limit Exceeded
*************

I started getting this code a month or two ago and thought it was a result of the fuel filter being all clogged up. It was way past due for a fuel filter change, but hat has since been done.

I also recently changed the plugs. The MAF seems to be a common cause from others but my MAF isn't very old. Also, there are no vacuum leaks that I know of as I fixed all of those as they have popped up over the years. All of the vacuum hoses are mostly new.

Every time I clear the code (and thus reset the fuel trim memory), I get REALLY rough idle -- almost to the point of ot running. After about 30-60 seconds of that, it seems to calm down and everything runs fine, however after driving a bit the CEL comes back on and this code reappears.

Any ideas suggestions? Perhaps I'll start with some MAF cleaner, but I suspect that isn't the issue given the MAF is only about a year old.

-Chris

 

have u changed the plugs yet? and have u ever have the coils replace?

 

Yes on both. MAF and Coil Packs are around 1 year old. Plugs are only a couple of weeks old.

Attached is a screen shot of some measuring blocks as seen at idle. It's weird that 032 is 0% no matter what.... isn't it?

-Chris

 

are the wires that lead to the coils in good shape? All the connections are snug and everything. Sometimes the wires become britttle with all the heat under the engine cover.

 

They are a bit brittle, but not extremely.

What exactly is that 032 measuring block anyway?

-Chris

 

Ahh okay, I get it now... those values adjust something like the richness offset and/or injector timing values offset based on what the ECU calculates from the O2 sensor about how efficiently the mixture is burning (as a result of how accurate the timing of the injectors is). I had just cleared the codes before I read that measuring block value, so it hadn't had time to re-adjust very much.

I have been driving it a bit (and have CEL on again), so I'll go pull the codes and read that measuring block at lunch time if it isn't still raining.

-Chris

 

From VWVortex.com - VAG-COM procedures for testing the MAF, O2 sensors and catalytic converter

 

Well, here is the measuring block 032 after running it for a while (and once the CEL has come back on). I will clean the MAF in the next few days and see how that goes. Looking at the MAF readings (measuring block 002), I see normal readings at idle (~3 g/s).

I'll post back how the clean MAF works.

-Chris

 

I got a ALT engine 2.0 petrol, whit this problem. I got this vaccum kit 06B 133 751 AT and it work again.