Crankshaft position sensor - Mercedes-Benz Forum

 
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post #1 of 5 (permalink) Old 05-06-2011, 02:48 PM Thread Starter
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Crankshaft position sensor

I have read dozens of messages posted on this part, which are very much like what I have said to myself.

My E320's engine stopped without warning or any sign of trouble in the middle of the road. Then, the light "check engine" appeared on the dashboard. This happened first time, and I was quite frightened by the incident.

The repair shop at the dealer shop charged me close to $500 (70% of the charge was for labor) to replace this faulty one and told me this incident is very rare (now I realize it was a lie) but happens to all machines as it is supposed to (meaning there is no difference between Chevy & MB).

So, I called MB HQ in NJ asking if there has been a recall on this part, without knowing there has been none according to all posted messages I read now.
I also asked them if they have any data on the expected life time of this part written in the spec of this part (was it a stupid question?), but they said the information is not available as it is a proprietary information (I think this was a weird answer).

Anyway, this whole experience losing the engine in the middle of the street totally took my confidence in MB cars out the window.

Last edited by hyunaham; 05-06-2011 at 02:51 PM.
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post #2 of 5 (permalink) Old 05-06-2011, 03:31 PM
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Wait, you're surprised that a part on a car can fail?

Actually, 90% of that charge was for labor as the part is around $50 online, that's why many of the folks here do basic repair and maintenance.

Casual observation is that the CPS on the M112 and M113 engines has a median lifespan around 100,000 miles. It's basically a hall-effect magnet and heatsoak eventually does it in; you might as well argue for a recall on brakes because they wear out.

I replaced my CPS at 90,000 miles because I was aware of the possibility and didn't want to be stranded somewhere. Always more convenient to change things on your own schedule.

Good luck.

Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy; its inherent virtue is the equal sharing of misery. (Winston Churchill)
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post #3 of 5 (permalink) Old 05-06-2011, 04:35 PM
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I would only add that first year had CPS with lower reliability, while later on MB made CPS with different part number that supposed don't fail.
If you complain about Mercedes CPS failing -try to read Ford forum on models from that era.
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post #4 of 5 (permalink) Old 05-06-2011, 04:52 PM
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Originally Posted by Kajtek1 View Post
I would only add that first year had CPS with lower reliability, while later on MB made CPS with different part number that supposed don't fail.
If you complain about Mercedes CPS failing -try to read Ford forum on models from that era.
Or Ford ECU failures a generation before...
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post #5 of 5 (permalink) Old 05-06-2011, 05:30 PM
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$350 for labor, $150 for part.
They got some credit for diagnosing the problem.
A skilled technician can do it in 10 minutes, CPS part is ~$40, online price.
They probably added the time they had to wait for the engine to cool down before replacing the CPS.
The lesson to learn herein is when you got your car towed to any shop, dealer or independent, you're at their mercy.
Unless your bank account is 5-6 digits, when car stalls in such way, tow it home then ponder your fix.

Last edited by mbvis; 05-06-2011 at 05:33 PM.
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