Hi there,i have a c200 elegance 2005,i seem to be having problem after problem and my pride and joy is becoming a money pit!! well here goes,it wont rev past 3000 revs, i was told this would be the mass air flow meter,so i changed that,now the car wont change gear either,i have to turn it off and restart the engine and its fine,i have just taken it up the road and im back to wont rev past 3000 again,please help me i dont have te money to keep pumping into this car and im at my wits end

For Mercedes C200 2.2 CDI (2005):

1. EOBD fault code: P0103

2. Fault location: Mass Air Flow (MAF) sensor / Volume Air Flow (VAF) sensor - high input

3. Probable cause: Wiring short to positive, MAF / VAF sensor, Engine Control Module (ECM)

First time you must check up wire by wire the MAF sensor electrical supply cable from the ECM. Try to find out if there is a short to positive wire!

The MAF sensor (B30) includes inside the Intake Air Temperature (IAT) sensor (B25).

On the MAF sensor (B30) you have 5 wires:

1. Violet wire #1 is coming from #31 pin from ECM (A35).

2. Brown wire #2 is coming from #17 pin from ECM (A35).

3. Green wire #3 is coming from #61 pin from ECM (A35).

4. Blue wire #4 is coming from #64 pin from ECM (A35).

5. Red / blue wire #5 is coming from #85 pin from ECM (A35).



For electrical continuity & resistance wires checking (between wires, positive and earth) you must disconnect the battery from car terminals and use a multimeter.



Let me know please what you will find out.



For Mercedes C200 2.2 CDI (2005):
1. EOBD fault code: P0103
2. Fault location: Mass Air Flow (MAF) sensor / Volume Air Flow (VAF) sensor - high input
3. Probable cause: Wiring short to positive, MAF / VAF sensor, Engine Control Module (ECM)
First time you must check up wire by wire the MAF sensor electrical supply cable from the ECM. Try to find out if there is a short to positive wire!
The MAF sensor (B30) includes inside the Intake Air Temperature (IAT) sensor (B25).
On the MAF sensor (B30) you have 5 wires:
1. Violet wire #1 is coming from #31 pin from ECM (A35).
2. Brown wire #2 is coming from #17 pin from ECM (A35).
3. Green wire #3 is coming from #61 pin from ECM (A35).
4. Blue wire #4 is coming from #64 pin from ECM (A35).
5. Red / blue wire #5 is coming from #85 pin from ECM (A35).

For electrical continuity & resistance wires checking (between wires, positive and earth) you must disconnect the battery from car terminals and use a multimeter.

Let me know please what you will find out.

If it is air intake too high, then did you reset the ECM ( engine control..) which is the computer bit controlling all functions of the engine etc..This does not auto update itself if there is any repair and you need a diagnostic device hooked up to it in order to reset/ erase this error. If it is air intake too high, then did you reset the ECM ( engine control..) which is the computer bit controlling all functions of the engine etc..This does not auto update itself if there is any repair and you need a diagnostic device hooked up to it in order to reset/ erase this error.