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How to replace the Crank Position Sensor (CPS) - S500
#1
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2000 s500
How to replace the Crank Position Sensor (CPS) - S500
Recently I had to replace the Crankshaft Position Sensor (CPS) in my 2000 S500 due to some starting issues. It is an incredibly quick and easy change, but since it seems like it's a common failure with these cars, I figured I'd document the procedure.
BACKGROUND
First - I started to notice starting the car when hot took more cranking than normal. Then one day I drove the car 15 minutes and parked it for ~2 hours, only to return to a car which would crank and crank and crank, but not start. After some research on this forum, I ended up purchasing a new CPS which completely resolved my issue. The CPS issue I experienced was also related to heat--eventually (while waiting for the new CPS to arrive) the car got so bad it would die if sat idling in a parking lot for 10 minutes, then would only re-start ~four hours later after all had cooled off.
REQUIRED ITEMS
1) New Bosch Crank Position Sensor (~$40 from autohausaz)
2) E8 female Torx Socket
3) 1/4 ratchet + 8-12in extension
PROCEDURE
1) Remove plastic engine covers (including air filters)
2) Access the CPS from the driver's side - back/bottom of the cylinder head (access pictured below)
3) Remove CPS Plug
4) Remove the CPS
- New and Old CPS ... removed -
BACKGROUND
First - I started to notice starting the car when hot took more cranking than normal. Then one day I drove the car 15 minutes and parked it for ~2 hours, only to return to a car which would crank and crank and crank, but not start. After some research on this forum, I ended up purchasing a new CPS which completely resolved my issue. The CPS issue I experienced was also related to heat--eventually (while waiting for the new CPS to arrive) the car got so bad it would die if sat idling in a parking lot for 10 minutes, then would only re-start ~four hours later after all had cooled off.
REQUIRED ITEMS
1) New Bosch Crank Position Sensor (~$40 from autohausaz)
2) E8 female Torx Socket
3) 1/4 ratchet + 8-12in extension
PROCEDURE
1) Remove plastic engine covers (including air filters)
2) Access the CPS from the driver's side - back/bottom of the cylinder head (access pictured below)
3) Remove CPS Plug
4) Remove the CPS
- New and Old CPS ... removed -
Last edited by amac; 01-12-2019 at 10:48 AM. Reason: changing image hosting location
#3
Recently I had to replace the Crankshaft Position Sensor (CPS) in my 2000 S500 due to some starting issues. It is an incredibly quick and easy change, but since it seems like it's a common failure with these cars, I figured I'd document the procedure.
BACKGROUND
First - I started to notice starting the car when hot took more cranking than normal. Then one day I drove the car 15 minutes, and parked it for ~2 hours, only to return to a car which would crank and crank and crank, but not start. After some research on this forum, I ended up purchasing a new CPS which completely resolved by issue. The CPS issue I experienced was also related to heat--eventually (while waiting for the new CPS to arrive) the car got so bad it would die if sat idling in a parking lot for 10 minutes, then would only re-start ~four hours later after all had cooled off.
REQUIRED ITEMS
1) New Bosch Crank Position Sensor (~$40 from autohausaz)
2) E8 female Torx Socket
3) 1/4 ratchet + 8-12in extension
PROCEDURE
1) Remove plastic engine cover's (including air filter's)
2) Access the CPS from the drivers side - back / bottom of the cylinder head (access pictured below)
3) Remove CPS Plug
4) Remove the CPS
- New and Old CPS ... removed -
BACKGROUND
First - I started to notice starting the car when hot took more cranking than normal. Then one day I drove the car 15 minutes, and parked it for ~2 hours, only to return to a car which would crank and crank and crank, but not start. After some research on this forum, I ended up purchasing a new CPS which completely resolved by issue. The CPS issue I experienced was also related to heat--eventually (while waiting for the new CPS to arrive) the car got so bad it would die if sat idling in a parking lot for 10 minutes, then would only re-start ~four hours later after all had cooled off.
REQUIRED ITEMS
1) New Bosch Crank Position Sensor (~$40 from autohausaz)
2) E8 female Torx Socket
3) 1/4 ratchet + 8-12in extension
PROCEDURE
1) Remove plastic engine cover's (including air filter's)
2) Access the CPS from the drivers side - back / bottom of the cylinder head (access pictured below)
3) Remove CPS Plug
4) Remove the CPS
- New and Old CPS ... removed -
#7
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2000 S430
awesome write up I was gonna take pics of mine too but I did mine at night but it was a easy fix for me the hardest part was getting into the are to get to the bolt!
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#11
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2000 s500
the pictures are showing up for me... are you still not seeing them?
here's the directory of pics:
http://www.qnorth.net/august/pub/s500_cps_rr/
here's the directory of pics:
http://www.qnorth.net/august/pub/s500_cps_rr/
#12
MBWorld Fanatic!
I am planning on replacing my CPS as a precautionary measure in my '02 CL500 and was looking at my Star Manual Library Manual for torque info. According to it, if the part is replaced, "re-initialization must be carried out with the Star Diagnosis". Since I see no mention of this here, am I correct in assuming that this step is not required?
Last edited by Jud Chapin; 12-25-2010 at 11:22 AM.
#13
MBWorld Fanatic!
Most people
don't adapt the cps to the ecu.
If you swap it out just start the car after you install the new cps and slowly rev it in park up to 2200rpm and hold it there for 30 seconds and then slowly back down to idle. This will index the cps to the ecu.
www.autohausaz.com has them for 42 bucks on sale
If you swap it out just start the car after you install the new cps and slowly rev it in park up to 2200rpm and hold it there for 30 seconds and then slowly back down to idle. This will index the cps to the ecu.
www.autohausaz.com has them for 42 bucks on sale
#14
MBWorld Fanatic!
don't adapt the cps to the ecu.
If you swap it out just start the car after you install the new cps and slowly rev it in park up to 2200rpm and hold it there for 30 seconds and then slowly back down to idle. This will index the cps to the ecu.
www.autohausaz.com has them for 42 bucks on sale
If you swap it out just start the car after you install the new cps and slowly rev it in park up to 2200rpm and hold it there for 30 seconds and then slowly back down to idle. This will index the cps to the ecu.
www.autohausaz.com has them for 42 bucks on sale
#15
MBWorld Fanatic!
Worst case
a misfire code. Minor case ??? Nothing.
I think it just speeds up what the ecu would eventually do anyway.
I think it just speeds up what the ecu would eventually do anyway.
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2003 S430 mercedes
I have a 2003 S430 Where is the CPS sensor located? Is it located next to the starter or the drivers side toward the back of the engine access toward the top of the engine? very frustrated. Then do you have any suggestions on where to purchase. I can't afford to take it to the dealer! Thanks, Keith
#20
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2000 S500
www.autohausaz.com 42$ plus 10$ ups charge
#21
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2002 mercedes-benz s500
HI, AND THANKS A LOT ALL OF U GUYS, IM A NEW HERE AND I HAVE FOUND REALLY IMPORTANT INFO ABOUT MY W220 AND HAS SAVE ME HUGE MONEY BY DOING IT MY SELF AND GET IN TO KNOW MY CAR A LOT BETTER, I HAD A PROBLEM 2 DAYS AGO MY CAR WONT START AFTER DOING MY RESEARCH ON THIS SITE I FOUND ANSWERS, JUST PUT MY NEW CPS TODAY AND MY CAR FLYS AGAIN, THANKS AMAC AND SKYLAW FOR UR TIME AND WORK.
#22
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www.autohausaz.com 42$ plus 10$ ups charge
#24
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2003 S430
your the man !! i always heard about this problem but never paid attention to it because i never understood it but with pictures and your explanation now i know what to expect and knowing my luck for sure ill get it this summer lol.
thanks again.
thanks again.
#25
Super Member
Another happy customer...
Mine went out last night (Saturday...go figure) I bought mine on a Sunday AM at the local Auto Zone...$57.00 out the door.
Had to bend the heat/water shield away to get access and put chewing gum in the torx socket to hold the bolt but other than that ...pretty simple.
This is my wife's car and like they say "A happy wife makes for a happy life".
Mine went out last night (Saturday...go figure) I bought mine on a Sunday AM at the local Auto Zone...$57.00 out the door.
Had to bend the heat/water shield away to get access and put chewing gum in the torx socket to hold the bolt but other than that ...pretty simple.
This is my wife's car and like they say "A happy wife makes for a happy life".