Having some issued with the engine management light coming on, on my 02 Audi S3 with BAM engine.
Car is running REVO stage 1.
Engine Management light came on and a scan with VCDS came up with the following two fault codes:
17511 - Oxygen (Lambda) Sensor Heating; B1 S1
P1103 - 35-00 - Performance too Low
16519 - Oxygen (Lambda) Sensor B1 S1; Heating Circuit
P0135 - 35-00 - Malfunction
Having replaced the pre-cat lambda sensor with a Bosch one from Euro the car drove fine for a day and then the EML came on again with the same codes.
I've checked the connector and the wires and they seem to be ok.
Replaced the coolant temp sensor as well and this hasn't made any difference.
Logged blocks 1,3,31 in VCDS with the following results:
The Lambda control actual vs specified aren't the same, anyone know what could be causing this? Possible boost or vac leak somewhere.
I'll be doing the PCV delete to rule out any of the breather system, A quick question on the diag below, the two hoses on the left circled in red and orange, do I just cap these off?
Any help would be appreciated.