CPS - "Crankshaft Position Sensor" Discussion Thread
Newbie
Joined: Mar 2007
Posts: 16
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From: Chicago
2002 C240
Help - car is dead cps help
I am sure my cps sensor is causing my problems. What I need to know is where it is located. I have searched every possible thread, but no one comes out and says exactly where the cps is on a 02 C240.
BTW CPS is crankshaft position sensor.
Please help, I am buying part in AM and changing roadside.
Thanks
BTW CPS is crankshaft position sensor.
Please help, I am buying part in AM and changing roadside.
Thanks
Last edited by H2O; Mar 3, 2008 at 10:10 PM.
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NA
Removing the CPS sensor
I just wanted to make an official statement 
I've been getting stalling problems like everybody else on my C240 4matic, and yesterday the car decided not to start anymore, cranks just fine but just won't catch anymore. So after some quick reading online, I discover it's the CPS sensor that's bad, and I also find that it is supposed to be a nice quick 30 minute job. Okay, cool, so I order a new CPS sensor (the crankshaft one; not the easier to replace camshaft sensor) and today started trying to pull off the sensor....
What a PITA!! It's not easy at all like everyone says, the sensor is located on top of the tranny bellhousing which is pretty much in the middle of the engine -- tranny hides it from bottom access, and hoses/wiring harness/intake manifold hides top access. There's no room in there at all, I almost got my hand stuck trying to feel where the bolt is. And one more thing is you can't see the bolt as it's hidden under the sensor so this makes it very difficult to fit a socket or what have you in there.
I've been staring at it for awhile now pondering if I should buy a short socket screwdriver for the bolt (it's a torx bolt but a 6.5mm regular socket fits) or a joint for my ratchet set.
That is all, I just wanted to throw some info out there in case anyone was considering doing this.
Might be better to suck it up and let the dealer take care of it
I've been getting stalling problems like everybody else on my C240 4matic, and yesterday the car decided not to start anymore, cranks just fine but just won't catch anymore. So after some quick reading online, I discover it's the CPS sensor that's bad, and I also find that it is supposed to be a nice quick 30 minute job. Okay, cool, so I order a new CPS sensor (the crankshaft one; not the easier to replace camshaft sensor) and today started trying to pull off the sensor....
What a PITA!! It's not easy at all like everyone says, the sensor is located on top of the tranny bellhousing which is pretty much in the middle of the engine -- tranny hides it from bottom access, and hoses/wiring harness/intake manifold hides top access. There's no room in there at all, I almost got my hand stuck trying to feel where the bolt is. And one more thing is you can't see the bolt as it's hidden under the sensor so this makes it very difficult to fit a socket or what have you in there.
I've been staring at it for awhile now pondering if I should buy a short socket screwdriver for the bolt (it's a torx bolt but a 6.5mm regular socket fits) or a joint for my ratchet set.
That is all, I just wanted to throw some info out there in case anyone was considering doing this.
Might be better to suck it up and let the dealer take care of it
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NA
Update: It's much easier if you unbolt a little bracket holding a small bundle of wires/hoses that is immediately above the CPS. This allows you to slip your hand into the crevice and "feel" for the torx bolt (which I was able to use that 6.5mm socket to pull out).
I replaced the sensor, the car still cranks but still doesn't run, so changing the CPS isn't the absolute magic bullet to curing these problems. Just for everyone's information....
I replaced the sensor, the car still cranks but still doesn't run, so changing the CPS isn't the absolute magic bullet to curing these problems. Just for everyone's information....
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Joined: Dec 2007
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2002 CLK 430
Help C240 shutoff while driving, only cranks
Hello smark people, I did a search and it may be the CPS going bad but can you confirm this because its a little different...
over a month ago i was coming north from NYC, doing like 90-95 when i felt a quick lost of power for like 1/2 a second...
later that day after going home i drove to my moms house as im backing up into her drive way the car shutsoff and would not start up. i tryed to crank over and over but nothing... it would turn over fine but it would not start up... just like if it was out of gas. i gave up and went out with the family for an hour. When i came back i tryed and the thing starts up right away...
i gave no mind and started to drive the car again... now last night i went to work to pick something up... i was in a rush so I did 90-100 in some parts of the highway (a 10 minute comute). i parked went in and came back out.... the car turned on fine but as im 1 mile away from work in the middle of nowhere really dark lol the car turns of while im on 4th gear.... same thing it would not start up, it would only turn over.... i got a ride and came back like 2 hours later and it started right up.
would this still be the CPS? if so where could i buy this little piece (autozone, napa?)... i cant afford to go to the dealer since i just got a house... the car has 91000 miles and im the second owner paid cash for it so i have no coverage
ohh its a 2001....
thanks
over a month ago i was coming north from NYC, doing like 90-95 when i felt a quick lost of power for like 1/2 a second...
later that day after going home i drove to my moms house as im backing up into her drive way the car shutsoff and would not start up. i tryed to crank over and over but nothing... it would turn over fine but it would not start up... just like if it was out of gas. i gave up and went out with the family for an hour. When i came back i tryed and the thing starts up right away...
i gave no mind and started to drive the car again... now last night i went to work to pick something up... i was in a rush so I did 90-100 in some parts of the highway (a 10 minute comute). i parked went in and came back out.... the car turned on fine but as im 1 mile away from work in the middle of nowhere really dark lol the car turns of while im on 4th gear.... same thing it would not start up, it would only turn over.... i got a ride and came back like 2 hours later and it started right up.
would this still be the CPS? if so where could i buy this little piece (autozone, napa?)... i cant afford to go to the dealer since i just got a house... the car has 91000 miles and im the second owner paid cash for it so i have no coverage
ohh its a 2001....
thanks
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From: Central Florida
R129, XF Sportbrake, SC400
Yes, it could still be the CPS if it cuts off while running. You can get it at the dealer but i think performanceproducts4benz.com has it cheaper last time i checked. I would change it anyway just to get the thought that it may be that out of the way.
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Joined: Sep 2006
Posts: 296
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From: FLORIDA
2003 C240
Hello smark people, I did a search and it may be the CPS going bad but can you confirm this because its a little different...
over a month ago i was coming north from NYC, doing like 90-95 when i felt a quick lost of power for like 1/2 a second...
later that day after going home i drove to my moms house as im backing up into her drive way the car shutsoff and would not start up. i tryed to crank over and over but nothing... it would turn over fine but it would not start up... just like if it was out of gas. i gave up and went out with the family for an hour. When i came back i tryed and the thing starts up right away...
i gave no mind and started to drive the car again... now last night i went to work to pick something up... i was in a rush so I did 90-100 in some parts of the highway (a 10 minute comute). i parked went in and came back out.... the car turned on fine but as im 1 mile away from work in the middle of nowhere really dark lol the car turns of while im on 4th gear.... same thing it would not start up, it would only turn over.... i got a ride and came back like 2 hours later and it started right up.
would this still be the CPS? if so where could i buy this little piece (autozone, napa?)... i cant afford to go to the dealer since i just got a house... the car has 91000 miles and im the second owner paid cash for it so i have no coverage
ohh its a 2001....
thanks
over a month ago i was coming north from NYC, doing like 90-95 when i felt a quick lost of power for like 1/2 a second...
later that day after going home i drove to my moms house as im backing up into her drive way the car shutsoff and would not start up. i tryed to crank over and over but nothing... it would turn over fine but it would not start up... just like if it was out of gas. i gave up and went out with the family for an hour. When i came back i tryed and the thing starts up right away...
i gave no mind and started to drive the car again... now last night i went to work to pick something up... i was in a rush so I did 90-100 in some parts of the highway (a 10 minute comute). i parked went in and came back out.... the car turned on fine but as im 1 mile away from work in the middle of nowhere really dark lol the car turns of while im on 4th gear.... same thing it would not start up, it would only turn over.... i got a ride and came back like 2 hours later and it started right up.
would this still be the CPS? if so where could i buy this little piece (autozone, napa?)... i cant afford to go to the dealer since i just got a house... the car has 91000 miles and im the second owner paid cash for it so i have no coverage
ohh its a 2001....
thanks
A few days before there was a moment where when I step on the gas the car would not respond; it will just rev up without moving like in neutral.
Then a few days later it went kaput!
Since then I get nervous driving when I hear something "out of character"
so to speak. I began overreacting to things now.
Good luck!
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From: San Diego, CA & San Jose, Costa Rica & Stuttgart, Germany
1959 220S / 1979 230 G / 2002 A210 AMG / 2003 C320 SC / 2004.5 C320 SS / 2005 ML350 SE / 2008 smart
wow...
there's been a rash of 2001-2003 C240 malfunctions this whole past week !
time to send all those C240's to Mexico......
there's been a rash of 2001-2003 C240 malfunctions this whole past week !
time to send all those C240's to Mexico......
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MBWorld Fanatic!
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From: San Diego, CA & San Jose, Costa Rica & Stuttgart, Germany
1959 220S / 1979 230 G / 2002 A210 AMG / 2003 C320 SC / 2004.5 C320 SS / 2005 ML350 SE / 2008 smart
Brasil Brasil
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
And Obrigado to you too - I hope my car doesn't catch this C240 "Rinderpest"!! - I might need to have a couple of Caipirinha's to sooth my nerves 
Maybe they are getting beyond their use by date but I doubt it - they are mechanically tough
Maybe they are getting beyond their use by date but I doubt it - they are mechanically tough
Last edited by Glyn M Ruck; Sep 13, 2008 at 05:24 AM.
MBWorld Fanatic!
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From: San Diego, CA & San Jose, Costa Rica & Stuttgart, Germany
1959 220S / 1979 230 G / 2002 A210 AMG / 2003 C320 SC / 2004.5 C320 SS / 2005 ML350 SE / 2008 smart
they are mechanically tough...
I think it's the electronic gremlins that are getting the best of them though.
All these sensors, electronic contraptions, and control modules just wreaked havoc on 2001-2002 C-Classes.
Carlos
Saprissa@aol.com
I think it's the electronic gremlins that are getting the best of them though.
All these sensors, electronic contraptions, and control modules just wreaked havoc on 2001-2002 C-Classes.
Carlos
Saprissa@aol.com
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Agreed! My car has given zero trouble and I hope it stays that way. Mine came off the line shortly before they started building up facelift stock and my order was accompanied by a letter from Jurgen Schrempp telling them to make sure I got a good car. Jurgen was always very proud of the SA operation after spending many years based here. To date it has been a very good car. To be fair we did not suffer a fraction of the nonsense with the RHD W203s that seem to have plagued NA models
Last edited by Glyn M Ruck; Sep 13, 2008 at 04:08 PM.
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From: SoCal
...a panty dropper...
It def sounds like the problems I was having with my 02 C240 when it shut off as I was driving and then started back up after waiting some amount of time. I drove it thinking it was fine but nope it shut off again in traffic. I had to call and get a flat bed to take it to the MB dealership and sure enough it was the CPS. Cheap sensor, expensive for the install since it is in a hard to reach area BEHIND the engine. I tried myself and failed so I opened my wallet and let MB do the work. Almost traded my C240 for a 08 C300 though.
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2002 CLK 430
hey guys, sorry been busy at work.... well i have been driving the damn super yellow IS300. i feel like a highlighter lol
anyways i ordered the sensor from carquest and picked it up the next day.
i took the big intake and then the intake "L" plastic piece that goes between the motor and the intake. from there all u need to do is remove some hoses and you will have access to the cps. this is where im at now, is any1 interested in pics ?
oh and the sensor was $96 from the carquest store.
anyways i ordered the sensor from carquest and picked it up the next day.
i took the big intake and then the intake "L" plastic piece that goes between the motor and the intake. from there all u need to do is remove some hoses and you will have access to the cps. this is where im at now, is any1 interested in pics ?
oh and the sensor was $96 from the carquest store.
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late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
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01' C32o
son of a itch!
just got home from sacramento, and my cps dies out. thank god i was at home already when it stalled out... i was scared as **** because the CPS sensor has been failing for the past 3 weeks and if it was to die when i was halfway to LA i would've been screwed! we need pics, ASAP! thanks!!!
just got home from sacramento, and my cps dies out. thank god i was at home already when it stalled out... i was scared as **** because the CPS sensor has been failing for the past 3 weeks and if it was to die when i was halfway to LA i would've been screwed! we need pics, ASAP! thanks!!!
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
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From: Mission Viejo, California
2008 c350 SG - 2004 c240 Wagon BS
The CPS is on the flywheel flange behind the left (from driver's seat) cylinder head. It's pretty much on the centerline of the head.
It is held on by a small bolt and you'll need a 1/4" ratchet with a 14" long extension to reach it. I cant recall what size socket you'll need but I think it's about 8mm.
It's easiest to reach in behind the cylinder head and unclip the wiring lead. (There's no room for your hand AND the tool so you'll get angry and cuss out that car a few times before you're done)
Remove the screw and the CPS pulls straight up.
The new CPS goes in and you have to line it up by feel.
I put some paper over the screw into the socket to hold it snug. (...After I dropped the screw a couple of times and had to take off the splash shield and jack up the car to get under there and retrieve the screw)
When you're done, clip the wiring connector back on and you're done. All in all it took me less than 1 hour.
It is held on by a small bolt and you'll need a 1/4" ratchet with a 14" long extension to reach it. I cant recall what size socket you'll need but I think it's about 8mm.
It's easiest to reach in behind the cylinder head and unclip the wiring lead. (There's no room for your hand AND the tool so you'll get angry and cuss out that car a few times before you're done)
Remove the screw and the CPS pulls straight up.
The new CPS goes in and you have to line it up by feel.
I put some paper over the screw into the socket to hold it snug. (...After I dropped the screw a couple of times and had to take off the splash shield and jack up the car to get under there and retrieve the screw)
When you're done, clip the wiring connector back on and you're done. All in all it took me less than 1 hour.
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From another post: " If you remove the air intake pipe from the throttle body then you can reach from the center of the engine rather than the side which gives a bit more space. "
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
