View Full Version : HELP - Lean code - included Vag Logs

06-02-2007, 03:13 AM
did a boost leak test and there appears to be no boost leak

could not get good logs because of traffic today. will do more later today

did WOT 2nd gear runs, could not get a good run on 3rd with the traffic.

Logs 115 001 002


any help with Logs would be great, should i measure other logs, measured block 032 and got high Lamda +24%

Noticed my Lambda readings are in the 20's, reaching as high as 24%

Also noticed my MAF g/s readings were very low, highest was 84.67g/s

dead MAF ??? or will a boost leak cause those numbers

06-02-2007, 04:16 AM
a dead MAF will cause a lean code. by the looks of it I think it is dead. Go to the dealer in the morning and get a new MAF (I think most parts departments close at 2 on sat). it is around $160 for the 2001 A4. BTW what are your mods...

06-02-2007, 04:38 AM
no mods, as soon as i decided to look into mods, the cel went on. Did not get a chance to install any parts at all.

i guessed it was the MAF, just needed some help incase i needed an 02 instead


06-02-2007, 07:29 AM
OH yeah, you have a dead MAF

06-02-2007, 08:36 PM
You can try cleaning the MAF sensor itself with denatured alcohol. Some auto stores also sell a maf cleaning agent, but it's probably a glorified denatured alcohol rebranded ;-)

Your lambda numbers should be negative at WOT (a naturally rich condition), so it looks like your MAF is having problems.

For future reference, increase the sampling rate in VAG-COM so you are sampling more / second. And only log one block at a time.