M156 Engine Oil Temp Sensor
Thread Starter
Newbie
Joined: Apr 2025
Posts: 2
Likes: 0
2012 mercedes c63 coupe
M156 Engine Oil Temp Sensor
Hi everyone,
I'm looking for some advice on replacing the engine oil temperature sensor on my W204 C63 Coupe.
After a hard drive, I noticed that my oil temperature readings started fluctuating and aren't staying consistent. I suspect the engine oil temp sensor might be faulty.
I've been having a hard time finding clear instructions online for this job. I understand that the sensor is located behind the AC compressor.
Is this a job that can realistically be done on a driveway?
Also, is the coolant temperature sensor located nearby, and would it make sense to replace it at the same time?
Thanks in advance for any help!
I'm looking for some advice on replacing the engine oil temperature sensor on my W204 C63 Coupe.
After a hard drive, I noticed that my oil temperature readings started fluctuating and aren't staying consistent. I suspect the engine oil temp sensor might be faulty.
I've been having a hard time finding clear instructions online for this job. I understand that the sensor is located behind the AC compressor.
Is this a job that can realistically be done on a driveway?
Also, is the coolant temperature sensor located nearby, and would it make sense to replace it at the same time?
Thanks in advance for any help!
Member
Joined: Oct 2023
Posts: 170
Likes: 38
Behind the a/c compressor.
Technically you can do it in a driveway, but the compressor has to be degassed and removed to access the temp sensor.
You may be able to put it on a lift with supports for the engine and drop the subframe slightly to get access.
Technically you can do it in a driveway, but the compressor has to be degassed and removed to access the temp sensor.
You may be able to put it on a lift with supports for the engine and drop the subframe slightly to get access.
Thread Starter
Newbie
Joined: Apr 2025
Posts: 2
Likes: 0
2012 mercedes c63 coupe
I don't have access to a lift so I can only jack the car up on the drive.
also is the coolant temp sensor in the same area, I know the coolant and engine oil temp sensor share the same part number?
MBWorld Fanatic!
Joined: Aug 2011
Posts: 5,351
Likes: 1,677
From: Kitchener, ON
2010 C63 AMG
You know... searching would have taken way less time than what it took to type out your original post AND you would have had all your answers already.
Crazy huh?
https://mbworld.org/forums/c63-amg-w...-location.html
Crazy huh?
https://mbworld.org/forums/c63-amg-w...-location.html
Member
Joined: Oct 2016
Posts: 86
Likes: 21
From: Nova Scotia
2013 C63 PP Sedan
I had my sensor replaced in September. Leaking oil filled the connector and was wicking up the wire. I had planned to do it in my friends garage, but decided to take it to a shop based on how long the repair takes. You have to either remove the AC compressor or loosen it and lower the subframe.
MBWorld Fanatic!
Joined: Nov 2012
Posts: 2,768
Likes: 419
'10 C63
It’s not your oil temp sensor. It’s your injectors. They need to be cleaned or replaced. Mine did the same. Replaced the sensor and it didn’t fix it. Happened to change my injectors and it totally fixed it.
