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Fitted to the W212 E250 M274 engine
Charge air temperature sensor
Mercedes part number 276905000
Unplug the cable
To remove the sensor lift the locking tab slightly with a screwdriver
and at the same time with an 8mm spanner twist it anticlockwise approx quarter to half turn
then wiggle it and pull it out of the pipe fitting (pipe that feeds the throttle assembly)
It is a thermistor and I measured the resistance at room temperature to be 10.3k ohms
I cleaned it with Liqui Moly Air Flow Sensor Cleaner
Check the o-ring seal
To refit the sensor insert it and twist clockwise until it click locks
You should be able to turn it by hand now that it has been out
Plug the cable back in
Last edited by Bruce Hubbard; Nov 22, 2023 at 03:40 AM.
Reason: add photos
Thanks everyone, I found it busted so will replace, It is on my SLS though not an E250. Would the data off this sensor also be used for the a reference etc for the radiator temp. When motionless with engine on, temp will go up to 130 celsius then drop down in 5 degrees increments which I put down to software.
BTW if anyone was following my gearbox saga it looks like the issue was just earthstraps loose so I now have a used gearbox for sale which is probably fine.
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