System too Lean error??????

[Bustermagic]

Can anybody help!!

Had this error (see below) on a Leon Curpa 180bhp. Does anybody know what causes this type of error and how to fix it.

Thanks

VAG-COM Version: Release 404.0-S

Control Module Part Number: 06A 906 032 HN
Component and/or Version: 1.8L R4/5VT 01 0001
Software Coding: 11510
Work Shop Code: WSC 06441
Additional Info: VSSZZZ1MZ2R017984 SEZ7Z0A1220032
1 Fault Found:
17544 - Fuel Trim: Bank 1 (Add): System too Lean
P1136 - 35-00 - -

[Sim]

Maybe you'll need a new MAF. When MAF reports faulty (less) air mass data, ECU injects less fuel than required. Monitoring the O2 sensor(s) ECU can detect the lean situation. Don't floor and drive fast on highways until you get a fix.

[Bustermagic]

Just checked the MAF sensor and requested and delivered amounts seem normal - still at a loss for whats causing the problem. :confused:

[Sim]

how much is your air mass flow @ WOT? g/s?

[Uwe@Ross-Tech]

The "(Add)" part means in the range where corrections are "Additive" rather than "Mutiplicative", in other words at idle or at very low loads. MAFs that are on their way out usually show up under load (with a "Mul" code). Rather than suspecting the MAF, I'd be looking for a leak in the intake (unmetered air) from a broken vacuum line or something like that.

-Uwe-

[Sim]

I see.