fastfrank

Hello everyone. I’m new to the forum trying to solve my nephew’s B5 S4 Avant. The process started with 13 engine codes and I’ve whittled it down to the following-
Address 01: Engine Labels: 078-907-551-AZA.lbl Part No: 8D0 907 551 M Component: 2.7l V6/5VT G 0002 Coding: 06711 Shop #: WSC 63251 VCID: 346D2D2204FEFEEA01-5124 3 Faults Found:

17539 - Oxygen (Lambda) Sensor; B2 S1
P1131 - 35-10 - Internal Resistance too High - Intermittent

16514 - Oxygen (Lambda) Sensor B1 S1
P0130 - 35-10 - Malfunction in Circuit - Intermittent

16487 - Mass Air Flow Sensor (G70)
P0103 - 35-10 - Signal too High - Intermittent

Readiness: 0010 0101
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Address 03: ABS Brakes Labels: 8D0-907-389.lbl Part No: 8D0 907 389 E Component: ABS/ESP allrad D56 Coding: 04395 Shop #: WSC 06435 VCID: 356B10260F84E7E236-5124
1 Fault Found:
18265 - Load Signal
P1857 - 35-10 - Error Message from ECU – Intermittent

When I rev the engine while stationary it winds cleanly to the redline. What does happen- the triangle lights up and the ABS light comes on for a few moments and then shuts off after a few moments of idle.When driving it stumbles significantly around 3000 rpm under load. The MAF was just replaced with a new Hitachi unit. Thanks!

johnkk

Check for vacuum/boost leaks. Clean connectors to O2 sensors back near firewall. If good and fault remains, consider replacing O2 sensors
Check connector to ABS module for corrosion. Check that ABS sensors at each wheel and toothed wheels on CV joints are clean. If all good, you could need a ABS module rebuilt.