snolvr

Hey folks,

I've just finished using the AW search feature and nothing comes up for D2 based vehicles. I appologize if this has been covered many times. Patient: 2001 A8 with 86k mi. I've got two codes that keep apearing just about every day. 17538 P1130 035 Bank 2 mixture adaptation (multi) system too lean. Also 17536 P1128 035 Bank 1 mixture adaptation (multi) system too lean.

Car does not seem to run any differently, worse or better, when the MIL illumintes with these codes. Any btdt would be greatly appreciated! Thanks!
Also, relatively new pads and rotors but the brake pad worn indicator in the dash likes to come on for no apparent reason also? Thanks again!

ttuling

It was for me at 87,000 miles on a 2001.

Of course I'm not suggesting you go get one without doing all the proper troubleshooting in the service manual, especially checking for an air leak between the MAF sensor and the throttle.

If I used VAG-COM to log airflow measured by the MAF sensor and engine rpm when I got onto the freeway at full throttle, the old MAF sensor showed 185 g/s at 6400 rpm in first gear, the new one 235 g/s. (These were on cool days, about 40 F. Hotter days might result in lower numbers.) There's no specification in the service manual what it should be, but 185 g/s in winter was intermittently turning on the MIL.

A rebuilt MAF sensor from a US Audi dealer was less than $200.

False brake wear warnings are usually due to corroded plugs near the pads. If so, clean the contacts then use dielectric grease to keep the water out.

Tom

Quattro 88 80

I'm chasing very similar codes on my 98. I've been told that a vacuum leak could cause this and haven;t been able to find one. You might want to check that out first. Also run all the tests in the Bentley. Good Luck and let us know what you find.

snolvr

Thanks for the reply's guys. Last night I spent the better part of 2 hours replacing all the vacuum lines in both the front and rear of the motor. Wow, they were all suspect, especially the ones at the rear of the motor that attach to what I would call the two combination valves. Very brittle with some holes throughout. I haven't seen a check engine light this morning but I haven't driven the car any great distance either. If this doesn't do it, I guess I'll look into the MAF next.

As far as the brakes go, I'll look into yoru suggestion of checking the contacts at the pad. If I need to I guess I can just solder together the wires? Thanks again for the replys.

snolvr

Ha! Spoke too soon, MIL just came on after a midday run. I guess I'm on to checking the MAF. Damn..