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Hi everyone. Yesterday I had cam belt replacement with water pump and alternator belt. Today I scan for some fault codes and two of them appeared.Six months ago was nothing. There is no any issues while driving, no flushing icons on dushboard. Just on idle I feel more vibrations in cabin. I didn't have this vibrations on Sunday before cam belt change. Can somebody can help me with any suggestions please? Should I clear codes and check if will not come back again?
Attachment 37220
Update your VCDS.
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I just borrow from my friend and should just write fault codes. It wasn't mine.
S, I had the first of these faults ( MAP sensor ) a month back. My vehicle at 55K miles with a CNHA ( 190 bhp ) engine had the MAP OEM number of 04L 145 049F. Face the car, look to back of engine to the right of its centre-line. On a light-colour metal bracket you will see a black lozenge-shaped plastic item about 4 cms long bearing a white rectangular label. Check the code I gave... it may be on the back. That is your MAP sensor. You can get these by phoning VW main agent parts dept. Cost is £60 + and there is a new variant labelled IIRC 04L 145 049K (? ) which is a mild revision. The MAP sensor for the CNHA is a 4 Bar unit and is not compatible generally with other A6 diesel engines. You should try clearing the fault with VCDS first. You can put a multimeter on the back of the wiring block ( 3 pins ) and read out the DC voltage as you have someone ( or yourself ) rev the vehicle. IIRC there is one pin that will vary ( the three are GND at 0 V, SENSOR POWER at 5V and SIGNAL 5V >> 0 V ) and should start high ( 5V ? ) and go down. If SIGNAL does not vary much as you rev you likely need a new MAP sensor. Replacing sensor fixed my car.... for a week.
I then head the second of your fault codes and I have not yet fixed it. I will update if I do because that is related to blockage of the DPF and that is a major pain to fix and/or costly. I will update.
So... delte codes first and see how she goes.
Vibrations... Unfortunately I have no idea. I am hoping that whoever did the cam belt etc. was meticulous. How bad are the vibrations for example ? Shaking your fillings out or merely making your vision blur ?
S, Forgot. To probe the back of existing MAP with multimeter you leave sensor connected and use a safety pin ( sharp end ) to probe ( ie. push into / alongside ) a wire going into back of connector. Set multimeter to read for 5V++ DC approx. then clamp one multimeter lead to the eye-end of safety pin and other multimeter lead to GND and watch voltage on sensor pin vary. You can put multimeter under the bottom of the open bonnet and place its display facing you on outside of windscreen. You can then see directly without outside assistance the voltage vary ( or not ) on the pin being probed.
BTW... This method of probing connectors directly is general.