[:@]Got my VAGCOM dumb interface today. CEL on, so pulled these three codes - too lean, O2 sensor, too rich. Cleared them and only O2 and too lean came back. Any ideas? I have a pin hole leak somewhere in the IC because I can hear it with pressure test, but why would a leak in the intercooler give me Too Lean? Can there be Vacuum there, to suck in unmetered air, and cause Too Lean - I thought only vacuum is behind the throttle body when you let off the gas? I'm thinking a leak in IC might cause boost leak and too rich, as air escapes thus causing more fuel in the ratio. What does intermittent mean in this application?
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VAG-COM Version: Release 409.1-US Chassis Type: 8D - Audi A4 B5 Scan: 01,02,03,08,15,17,25,35,45,55,56 ------------------------------------------------------------------------------- Address 01: Engine Controller: 4B0 906 018 P Component: 1.8L R4/5VT G 0006 Coding: 07201 Shop #: WSC 06335 3 Faults Found: 17536 - Fuel Trim: Bank 1 (Mult): System too Lean P1128 - 35-00 - - 17521 - Shareware Version. To Decode all DTCs P1113 - 35-10 - Please Register/Activate - Intermittent 17545 - Shareware Version. To Decode all DTCs P1137 - 35-10 - Please Register/Activate - Intermittent Readiness: 0000 0000

VAG-COM Version: Release 409.1-US Chassis Type: 8D - Audi A4 B5 Scan: 01,02,03,08,15,17,25,35,45,55,56 ------------------------------------------------------------------------------- Address 01: Engine Controller: 4B0 906 018 P Component: 1.8L R4/5VT G 0006 Coding: 07201 Shop #: WSC 06335 2 Faults Found: 17521 - Oxygen (Lambda) Sensor: B1 S1: Internal Resistance too High P1113 - 35-10 - - - Intermittent 17536 - Shareware Version. To Decode all DTCs P1128 - 35-00 - Please Register/Activate Readiness: 0010 1101

 

Fix the leak. When under boost it will be rich, and
when there is vacuum it will be lean.

 

ill go with leaky injector(s)

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