A4 Cab 1.8T running lean and over revving
Had my A4 Cab 1.8T serviced recently and since then been getting engine dash light appearing occasionally.
Can drive for 500 miles (motorway) and then as soon as I stop it comes on, or if you leave the car idling for 30 mins it comes on
I have studied measuring blocks for engine (032 lambda idle) and window 1 goes from 0 upto 10% when I reset the fault code within minutes indicating its running lean, but the 2nd window which apparently means lambda not idle is not as bad, just had the car back at an Audi specialist who says he can't find the cause.
I suspected an air leak but the garage can't find it
Over to you guys !!!
VAG-COM Version: Release 409.1-US
Control Module Part Number: 8E0 909 518 AL
Component and/or Version: 1.8L R4/5VT G 0003
Software Coding: 0011584
Work Shop Code: WSC 00672
2 Faults Found:
17544 - Fuel Trim: Bank 1 (Add): System too Lean
P1136 - 001 - Upper Limit Exceeded
16891 - Idle Control System RPM Higher than Expected.
P0507 - 001 - Upper Limit Exceeded - Intermittent