[s-cars] Running Rich: Help with Fault Code

[lebakken1 at netzero.com]

Message: 3
Date: Tue, 22 Mar 2005 16:05:46 -0700
From: Brian Powell <powellb at gmail.com>
Subject: [s-cars] Running Rich: Help with Fault Code

Brian Powell wrote:

Greetings, my car has been running rich of late. I had an oldish O2
sensor in there, so, I replaced with a universal (I didn't pull codes
before this). After 10 days, it is still acting the same way, so I
plugged in VAG-COM and got the following fault code:

00537  - Lambda (Oxygen Sensor) Regulation
         11-10 - Control Limit Not Reached - Intermittent

So, a new (spliced) O2 sensor and this is there. Granted, it could be
left over from the previous O2 sensor; however, things are still rich.
The tailpipe is blackened and the plugs are sooty.

Any ideas?

BTW, I have an RS2 setup with 37# injectors and MRC software. I am
also at altitude (Denver).

Brian - I am running the same as you, except no RS2 MAF or cams. My car runs rich as well. My car also has very poor fuel mileage - even when I keep my foot out of it. I also have to wipe my cars butt occasionally of carbon soot. Most annoyingly, I am getting fault codes (2456?), and I have been ever since I MRC'd my car last July. I have replaced the OXS. I am going to do the plugs and plug wires soon, though I am not too confident it will resolve the problems. Sometimes my car pulls strong and evenly, sometimes it gives the uneven pull which I absolutely despise - more so than the complete miss I got at WOT the other night. At least those problems are more easily diagnosed.

I have replaced the major three hoses with SAMCO's, and I do not believe I have any intake leaks.

It has been a frustrating several months - as the car I modified was perfect. The last thing I wanted to do was screw it up in anyway. I wish I had more time to look in to it.

Please let me know what you find.

Regards,

Craig Lebakken
94 S4