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View Full Version : Check engine light for p1128 (bank 1 system to lean)



tylerhager
11-02-2010, 11:00 AM
I RAN A VAGCOM ON IT AND THESE WERE THE RESULTS. IM NOT TO SURE WHERE THE PROBLEM WOULD BE EXACTLY THOUGH, I HAVE REPLACED THE FUEL FILTER AND THAT DID NOT HELP. ANY HELP WOULD BE GREATLY APPRECIATED. THANKS

Address 01: Engine
Controller: 4B0 906 018 CH
Component: 1.8L R4/5VT G 0002
Coding: 16201
Shop #: WSC 63351
1 Fault Found:
17536 - Fuel Trim: Bank 1 (Mult): System too Lean
P1128 - 35-00 - -
Readiness: 0010 1001

tylerhager
11-04-2010, 06:26 PM
anyone?

turbo_bootin
11-04-2010, 06:27 PM
MAF, O2 sensor or a vac leak.

tylerhager
11-04-2010, 06:29 PM
i jjust did the maf and no luck, any ways of making a home smoke test?

guy022077
11-04-2010, 07:31 PM
yup
just goolge boost leak test most of the videos that will come up are 1.8ts.
a small pvc pipe and an air compressor

walky_talky20
11-04-2010, 07:46 PM
So, you have a brand new MAF sensor? This code is almost always caused by a faulty or dirty MAF. Other than that, make sure there aren't any leaks between the MAF and the intake manifold.

Other things you can do to help:
- log the MAF (measuring block 003)
- check long term fuel trims (measuring block 032)
- stay away from the CAPS LOCK key, just a courtesy

brockallentaylo
11-04-2010, 07:52 PM
Boost leak=Rich for the most part because their is almost always some positive pressure in the piping.
Manifold leak=Lean (off boost) as far as the O2 is concerned.

I don't know how this is supposed to help, in my twisted brain it does though.

bandit
11-05-2010, 04:17 PM
tyler I'm a VW tech and live in A-town if you would like some help. I work for beer [up]

yuriy
11-06-2010, 08:37 AM
Had the same code, ended up being the MAF, but it can also be the o2 sensor.

tylerhager
11-06-2010, 11:07 PM
ended up being a cracked hose from the turbo to the n75 valve. found it after making a pressure tester.
My apologies for the caps lock, i didnt even take notice to it. Thanks for the help guys!