Date registered: Dec 2008
Vehicle: 1991 190E 2.6lt; 1998 E320 Wagon 4Matic; 2007 E350 4Matic; 2004 C240 4Matic
Location: Vancouver Canada
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Crankshaft Position Sensor failure is a real common problem on both my E320/W211.
It is definately a DIY repair. The Canadian Mercedes dealer sells the CPS for $185.00. I buy the Bosch sensor from AutohausAZ for $46.00 CDN. You will need to determine if your wiring harness has two locking clips or one on it before you repalce it. This is as simple as reaching down to its location and removing the harness and visually checking it.
The tools required for this job are;
1. an E8 socket, 1/4inch drive
2. an 8-12 inch 1/4" drive extension
3. a 1/4" swivel adapter (socket)
4. and of course a 1/4" ratchet
5. needle nose pliers and a magnet may come in handy.
When removing the bolt from the sensor my advice is to do it in stages. Undo the bolt 3 or 4 turns then use your needle nose pliers to pull the sensor up until it bottoms on the bolt head. do this a few times until the sensor is out. the reason for this is that you stand a good chance of losing the bolt if you take it out all at once. You have a very limited space and are doing this job by feel. My 1998 wagon had the double locking clip configuration. I found it easiest to remove the harness and sensor as one unit as the double clipped harness was difficult to get off in the confined space. Using the 1/4" drive tools give you just a bit more room to work with, especially helpful when removing CPS from S-class as the space is even further compromised by a metal plate. Good Luck!
Last edited by chiro; 10-18-2012 at 12:52 PM.