DavidST

Recently I started getting this code - P1128 ,
Long term trim mult bank1 lean. Has anyone fixed this and know what it is. Apparently it could be oxygen sensor, vacuum, etc. I am afraid this could be a fortune in parts and labor to fix.....

Thanks ahead of time.

David

olde_fortran

prob MAf, might need 02's too

Chalfont

i had a similar thing. Firstly I assume 'check engine light' you mean the little red picture of the block - I don't know the codes but my car (A4 3.0)thought it was running lean.

The dealers / roadside guys checked:
The coil packs - changed lots of them.
Checked any and all sensors.
Loaded new software.
Checked the exhaust wasn't sucking clean air in through a leak or crack - therefore giving a false lean reading.
Finally mine was damaged fuels lines (previous owner incident) effecting the fuel pressure. the fuels lines are covered by long black plastic covers on the underside.

Good luck.

DavidST

I guess it could a multitude of things.

KCS4a

mine was two vaccuum leaks, asame codes, check with fog vaccuum tester, I bet its cheap fix

DavidST

Where did you find the leaks?

KCS4a

two vaccuum hoses, one easily visible the ohter way down under, used smoke system at buddy's shop to find them, fixed for about $26 in parts