Aaron.............I don't think Bazzle did give you a 'Bum Steer'........but I think you are now on the wrong track............the P0803 upshift code is generic......the MB Code for P0803 is Component A 16/7 defect.....this is the air bypass valve (ABV) you checked in your initial post.....................
Your ABV may not be faulty, but the control or connections may be faulty.......this could explain the code persistence and the fact that the valve worked after the code was cleared.........
If the performance combo of the ABV, kompressor clutch and cam adjusting magnet are not working then there is a very obvious lack of power........
In my case it was the electrical connection at the ABV.....very easy fix.....but I understand the famous K40 relay is also involved with this combo.............
Bazzle..........if you disconnect the ABV electrical connector and then do a Carsoft scan I think you will get a P0803 code......................I can double check this ....but this is what I can remember from last year when I was investigating these things............
http://www.benzworld.org/forums/r170-slk-class/1272548-air-bypass-valve-fault-help-plz.html
Cheers
David
Your ABV may not be faulty, but the control or connections may be faulty.......this could explain the code persistence and the fact that the valve worked after the code was cleared.........
If the performance combo of the ABV, kompressor clutch and cam adjusting magnet are not working then there is a very obvious lack of power........
In my case it was the electrical connection at the ABV.....very easy fix.....but I understand the famous K40 relay is also involved with this combo.............
Bazzle..........if you disconnect the ABV electrical connector and then do a Carsoft scan I think you will get a P0803 code......................I can double check this ....but this is what I can remember from last year when I was investigating these things............
http://www.benzworld.org/forums/r170-slk-class/1272548-air-bypass-valve-fault-help-plz.html
Cheers
David
