Sten M

!!!UPDATE: SEE LAST POST!!!

Hi!

My car details:
Audi A6 C5 1.8T 2000, Motor code: ANB
My fuel consumption has gone as high as 14l/100km. I cant be sure but I think it started after I changed MAF sensor, I dont know if this is associated with the high fuel consumption.
Fault codes:

VAG-COM Version: Release 409.1-S

Control Module Part Number: 4B0 906 018 AL
Component and/or Version: 1.8L R4/5VT G01 0002
Software Coding: 05002
Work Shop Code: WSC 02325
4 Faults Found:
16502 - Engine Coolant Temp. Sensor (G62): Signal too High
P0118 - 35-00 - -
17965 - Charge Pressure Control: Positive Deviation
P1557 - 35-00 - -
17521 - Oxygen (Lambda) Sensor: B1 S1: Internal Resistance too High
P1113 - 35-10 - - - Intermittent
16524 - Oxygen (Lambda) Sensor B1 S2: No Activity
P0140 - 35-10 - - - Intermittent


Should I change both oxygen sensors or these fault codes can be due to a malfunctioning MAF sensor or MAF sensor is not associated with this. (I attached MAF sensor readings)

By now I have replaced the coolant temp sensor, deleted all fault codes. Then I went for a ride to check if the fault codes will come back and unfortunately they came back. I used break cleaner to find any vacuum/boost leaks, but I did not find any.
I did a boost reading with VCDS. Here are the results. Is it normal or not?

Sten M

UPDATE

I have replaced the O2 sensor and now the O2 sensor fault is gone. I also did a boost leak check and found nothing. I deleted all the fault codes and got another ones.
VAG-COM Version: Release 409.1-S

Control Module Part Number: 4B0 906 018 AL
Component and/or Version: 1.8L R4/5VT G01 0002
Software Coding: 05002
Work Shop Code: WSC 02325
2 Faults Found:
17965 - Charge Pressure Control: Positive Deviation
P1557 - 35-00 - -
17535 - Fuel Trim: Bank 1 (Mult): System too Rich
P1127 - 35-00 - -

clancy

Did you ever change the coolant temp sensor? Cheap and easy and a defective one can cause many issues. Does not always throw a code. I would do it before spending more time or money.

Sten M

Sorry for not mentioning, this was the first thing I changed. It only cleared the Coolant temp sensor code.

Sten M

I deleted the previous fault codes after checking them in the first place, but now I checked again and got these fault codes:

VAG-COM Version: Release 409.1-S

Control Module Part Number: 4B0 906 018 AL
Component and/or Version: 1.8L R4/5VT G01 0002
Software Coding: 05002
Work Shop Code: WSC 02325
5 Faults Found:
16524 - Oxygen (Lambda) Sensor B1 S2: No Activity
P0140 - 35-10 - - - Intermittent
17965 - Charge Pressure Control: Positive Deviation
P1557 - 35-00 - -
17535 - Fuel Trim: Bank 1 (Mult): System too Rich
P1127 - 35-00 - -
16712 - Knock Sensor 1 (G61): Signal too High
P0328 - 35-10 - - - Intermittent
16717 - Knock Sensor 2 (G66): Signal too High
P0333 - 35-00 - -

Sten M

Okey, I have replaced the lambda and the fuel consumption went down. But now when the motor has heated up it spits white/gray smoke from the exhaust. Not all the time, but often when shifting gears or stopping after driving then on idle.
Could it be the turbo oil ring? I did a boost reading test again. Here is the results: Also the fault code "17965 - Charge Pressure Control: Positive Deviation
P1557 - 35-00 - - " still remains