I have a C220 (UK spec) petrol with 270,000 miles (nearly all mine and all done on freeways, so car has been very reliable), but in the last month it has developed three issues (maybe not connected, but not sure).

1) It has started stalling when braking, it seems that it just very reluctant to down-shift to the point of stalling from any gear. If I gradually slow down (just let the car coast) then it will stay running but dips to <500rpm before suddenly changing down, which it does for every gear. I am developing a method of braking/coasting/braking/coasting to get the car to stop without stalling, but it's getting annoying, any help appreciated.

2) The ABS light came on and has stayed on for the last several trips (it comes on when the key is turned to position one and stays on all the time). I have had it go off once after restarting from a stall (I started from Neutral, which was unusual) and it stayed off for the rest of my trip, although it did trigger the ABS when at very slow speeds (felt through brake peddle). Which I understand is typical of a failed sensor.

3)Cruise control failed - Always been very reliable (although don't get much chance to use it on crowded UK roads!!), but now doesn't work 99% of time and for the 1% of time is very erratic and can accelerate or just stop working and the car coasts to a stop.

I got the codes read at my local independant mercedes specialist and fund the HFM fault memory had:-

008 Intake air temp sensor B17 loose contact
022 CC, EFP, actuator signals emergency mode
020 Idle speed control at lower control stop

Also read codes from the ABS controller:
C1102-016 Rpm sensor RA L6
C1314-004 Voltage supply solenoid valves

The mechanic has suggested a replacement Rear Axle ABS sensor, which seems sensible considering the fault code, and I may get a supply solenoid replaced as well. I have checked the OVP solenoid and it seems OK.

I am mainly concerned of the stalling issue, could it be a faulty temp sensor? I have read others having removed the sensor and the car still run. Or can it be the transmission sticking??

Car is still driveable and is booked in for Thursday, but with the mix of faults I could do with some help to keep costs down.

Thanks all and keep up the good work, these posts have saved my wallet on many occasions!!