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Boost readings, Lambda fault, high fuel consumption (Fault codes included)
!!!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?
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 - -
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.
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