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CPS - "Crankshaft Position Sensor" Discussion Thread

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Old 03-15-2006, 12:29 AM
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Old 04-21-2006, 02:55 PM
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How much did it cost you to fix and replace the crank sensor?
Old 04-21-2006, 03:54 PM
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It sounds a little complicated. It could be one of multiple things. IMO...Fuel pump, fuel pump relay, module, crank/cam sensor, MAF sensor, ECU. I'm NO expert on MB's but if I was you, I would let the experts at the MB dealer work on it. It's VERY hard to troubleshoot intermittent problems without scanners or test lights at the time the problem or malfunction shows up.

Good Luck!!!

Al
Old 04-21-2006, 05:43 PM
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Crank Position Sensor

Where is the Crank Position Sensor located and has anyone replaced it themselves?
Old 04-21-2006, 06:34 PM
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I don't have a C240 so I can't give specifics but in general, it's in the back of the engine by the flywheel. Here's a place to get it. I didn't know what year so I plugged in 2004. MB calls it a reference sensor, $68 and knowing MB, probably requires a torx socket to get it off.

http://catalog.drivewire.com/drivewi...ference+Sensor

BTW, why would you replace it yourself, it's covered under the Clean Air Act as an emmissions control device and covered for 80K miles.
Old 04-21-2006, 09:44 PM
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its your MAF or CPS crank position sensor MOST likely. try a search , it helped me with this problem a while back.
Old 04-23-2006, 01:51 PM
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Originally Posted by Buellwinkle
IBTW, why would you replace it yourself, it's covered under the Clean Air Act as an emmissions control device and covered for 80K miles.
Thank you for the response. The car is a 2001 and I took it to autozone and hooked it up to their computer and it read that it was the crank position sensor. Would the SA at the dealership know of this Clean Air Act? Is there anything from MB stating that they will replace anything in regards to the emmissions as long as the car is below 80k miles? I am taking it in to the dealer this coming week.
Old 04-23-2006, 05:18 PM
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Did you buy the car in the United State of America? If so, open the owners manual and look for the warranty booklet, you know, the owners manual that you never opened before and look at the first page, the one that tells you how long each warranty is, there's about half dozen different warranties. Look at the one that says Federal Emmisions Warranty 8 yrs, 80,000 miles. Now I can't vouch for how smart your SA is but some can actually read so if he doesn't know, bring him the warranty booklet and say fix it or I'll turn you into the FBI who will send him to Guantanamo Bay, Cuba for interigation.....

On the EPA's website it shows exactly what components are covered but I'm sure anything that makes your check engine light go off is covered. There are no exceptions to this warranty, they can not void it no matter how many mods you have done, it's part of the federal clean air act.
Old 04-23-2006, 08:10 PM
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Originally Posted by C240-Merc
Thank you for the response. The car is a 2001 and I took it to autozone and hooked it up to their computer and it read that it was the crank position sensor. Would the SA at the dealership know of this Clean Air Act? Is there anything from MB stating that they will replace anything in regards to the emmissions as long as the car is below 80k miles? I am taking it in to the dealer this coming week.
It's very small and held in with one bolt. It is not far from the transmission bell.
Old 04-24-2006, 11:03 AM
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Well, on my way to the dealer this morning my car died on me twice. I was able to get it started 20 minutes after each stall, but man it was a problem! The car is at the dealer to get hooked up to their diagnostic machine and hopefully to resolve the problem by the end of today. Thank you all for your help. I will let you know what happens.
Old 04-24-2006, 10:20 PM
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CPS will do that to you, makes the car run like feces. So what happened?
Old 04-24-2006, 11:28 PM
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FIXED for $105.00

Originally Posted by Buellwinkle
CPS will do that to you, makes the car run like feces. So what happened?
It's amazing what effect a little sensor like the crank position sensor has on our cars. Mine is a 2001 C240 and the sensor is actually located in the front of the engine, I had the SA show it to me. After they hooked it up to diagnostic machine they determined that the only problem was the CPS. I thought it was the alternator as well because of how it stalled out on me twice this morning-I was wrong. Apparently it is a common problem and towards the end of the sensor's life it will stop working if it becomes hot under normal temperatures which is after the car has been on for at least 30 minutes. The sensor was only $105 and the dealer was able to fix the problem today! The car acts like it did on the first day that I bought it! Thanks for everyone's help on this forum!
Old 04-25-2006, 12:02 PM
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They charged you to fix it? Do you have over 80K miles?
Old 04-25-2006, 01:58 PM
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Originally Posted by Buellwinkle
They charged you to fix it? Do you have over 80K miles?
yes they did.
Old 12-28-2006, 12:55 AM
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stuck on freeway

dam, some how on freeway today, my engine shut off.. and wont start.. at all..
after 30 min car start ok......
any idea?
Old 12-28-2006, 01:54 AM
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that's weird
does it stop suddently??
or it stop while you are at stop??
Old 12-28-2006, 06:11 AM
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white and whiter
haha.

it started right? it's gotta be the crank position sensor like i told you. lol
Old 12-28-2006, 09:48 AM
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Originally Posted by FrankW
haha.

it started right? it's gotta be the crank position sensor like i told you. lol
Yep, that happened on my mom's ML for a while. We changed the sensor and it never happened again.
Old 12-28-2006, 11:45 AM
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Yeah, the sensor. It happened to some folks I know too.
Old 12-28-2006, 12:17 PM
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Originally Posted by SlvrC230SS
Yeah, the sensor. It happened to some folks I know too.
yeah...happened to me
Old 12-28-2006, 01:02 PM
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The CPS issue is common with MB, also a faulty fuel pump.
Old 12-28-2006, 01:29 PM
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Originally Posted by Buellwinkle
The CPS issue is common with MB, also a faulty fuel pump.
crap! this is starting to worry me! how much are those parts/labor costs? my w203 will be out of warranty in about a year!
Old 12-28-2006, 02:56 PM
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2002 C230 coupe , NOt THE AVATAR!!
Originally Posted by nlpamg
crap! this is starting to worry me! how much are those parts/labor costs? my w203 will be out of warranty in about a year!
that's y when ur mercedes is down... there is always a bimmer... when both r down, there is always a bike, if all won't work, u can call in sick
Old 12-28-2006, 07:39 PM
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white and whiter
Originally Posted by Brabus_x2
that's y when ur mercedes is down... there is always a bimmer... when both r down, there is always a bike, if all won't work, u can call in sick
LOL
Old 12-28-2006, 07:50 PM
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Originally Posted by Brabus_x2
that's y when ur mercedes is down... there is always a bimmer... when both r down, there is always a bike, if all won't work, u can call in sick
nice!


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