2002 mercedes c240- check engine light on-obdii says:transmition range sensor circut malfuntion. The car will not leave 1st gear and shifts very hard from drive to neutral and will not shift to reverse or park. I have to shut the car off and then shift to park. This just started 2 days ago and it does not happen all the time.

check engine lights also refer to transmission problems , over heating
best answer is to have the fault codes read to determine if a sensor failure or a real expensive problem

Lead foot, tire pressures, stop /go driving. AC/poor compression, Trunk full of sandbags, transmission slipping, Wheel bearing friction, Brake shoe always on, etc.

1100-
C1100 ABS Pump Switch Circuit Failure P1100 MAF Sensor Intermittent/ Check of all OBDII Systems Not Complete P1100 FORD Mass Air Flow Sensor Intermittent P1100 HYUNDAI Map Sensor - Malfunction P1100 LEXUS BARO Sensor Circuit Malfunction P1100 TOYOTA Barometric Pressure Sensor Circuit Fault U1100 SCP (J1850) Invalid or Missing Data for Primary Id 1181-
C1181 Park Brake Valve Solenoid #1 Sense Input Circuit Short to Gound P1181 Fuel Delivery System Malfunction - High P1181 FORD Fuel Delivery System Malfunction - High P1181 HYUNDAI Fuel Pressure Monitoring U1181 SCP (J1850) Invalid or Missing Data for Personalization (Memory) Features 0004- P0004 Fuel Volume Regulator Control Circuit High P0004 Description Fuel Volume Regulator Control Circuit High is the generic definition for the P0004; however your vehicle's manufacturer may have a different definition for the P0004 code. Tech notes The P0004 is an OBDII generic code, but almost none of the vehicle manufactures use it. If you are getting this code, make sure you are using the correct OBDII code scanner for your vehicle's make and model.

Here is the info

NOTE: The ignition key must not be on prior to the cold start otherwise the heated oxygen sensor diagnostic may not run.

1. As soon as the engine starts, idle the engine in drive for two and a half minutes with the A/C and rear defrost on. OBDII checks oxygen sensor heater circuits, air pump and EVAP purge.

2. Turn the A/C and rear defrost off, and accelerate to 55 mph at half throttle. OBDII checks for ignition misfire, fuel trim and canister purge.

3. Hold at a steady state speed of 55 mph for three minutes.

OBDII monitors EGR, air pump, O2 sensors and canister purge.

4. Decelerate (coast down) to 20 mph without braking or depressing the clutch. OBDII checks EGR and purge functions.

5. Accelerate back to 55 to 60 mph at half throttle. OBDII checks misfire, fuel trim and purge again.

6. Hold at a steady speed of 55 to 60 mph for five minutes.

OBDII monitors catalytic converter efficiency, misfire, EGR, fuel trim, oxygen sensors and purge functions.

7. Decelerate (coast down) to a stop without braking. OBDII makes a final check of EGR and canister purge.

when your car stall check how the coolant temp by using multifunction switch on steering wheel you can see on instrument cluster display rang should be between 80 dig to 95dig if it's withing the range check crank angle sensor, normally crank angle sensor play when it's too hot if it's play need to be replace it's bit hard to do in 112 engine in c class.

U have to operate the engine at all kinds of diff speeds and drive modes, it is called a OBDII drive cycle, here is how u do one.
1. As soon as the engine starts, idle the engine in drive for two and a half minutes with the A/C and rear defrost on. OBDII checks oxygen sensor heater circuits, air pump and EVAP purge.

2. Turn the A/C and rear defrost off, and accelerate to 55 mph at half throttle. OBDII checks for ignition misfire, fuel trim and canister purge.

3. Hold at a steady state speed of 55 mph for three minutes.

OBDII monitors EGR, air pump, O2 sensors and canister purge.

4. Decelerate (coast down) to 20 mph without braking or depressing the clutch. OBDII checks EGR and purge functions.

5. Accelerate back to 55 to 60 mph at half throttle. OBDII checks misfire, fuel trim and purge again.

6. Hold at a steady speed of 55 to 60 mph for five minutes.

OBDII monitors catalytic converter efficiency, misfire, EGR, fuel trim, oxygen sensors and purge functions.

7. Decelerate (coast down) to a stop without braking. OBDII makes a final check of EGR and canister purge

you need to use an OBDII scan tool that will read any "error" codes and give you the system that will be causing the check engine light to come on. this tool will also allow you to erase the code after you have read it. write the code down as you may have to pinpoint exactly what part may have failed and needs replacing. something as simple as a loose gas cap will cause the check engine light to come on. it could be any of a dozen different emission or ignition sensors that may be bad depending on the error code. all 1996 and newer vehicles sold in the US will have the OBDII system and standard diagnostic/data link connector,which is usually under the driver side of the dash, to plug the scan tool into to read the DTC's(diagnostic trouble codes).

This is a trans range switch code, try this: on top of the transmission, by the selector lever, there is the range switch, remove the electrical connector to the switch and clean the terminals inside the connector, add some dielectric gears to the terminals (avail at any parts store), and reconnect. Disconnect negative battery terminal for 60 sec., reconnect switch, drive the car a few d ays and see if MIL light come on again.

I have a 2002 C240 Mercedes and need to replace the cabin air filter. Problem, I don't know were it is located or how to replace it. Can you help me.

the obd2 conector is feed by a fuse locate the fuse boxes and test all the fuses specially the courtesy light fuses and the lighter fuse