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Old 06-10-2015, 02:23 PM
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How to replace the Crank Position Sensor (CPS) - S500

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Old 11-21-2009, 11:24 PM
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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 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 -

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Old 11-22-2009, 12:26 PM
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Thank you, amac - going into my bookmarks for sure!
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Old 05-28-2010, 09:39 PM
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Originally Posted by amac View Post
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 -

Thanks a Million!!!! You were on point with this and it definitely solved my problem!!!!
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Old 05-28-2010, 09:41 PM
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Originally Posted by Skylaw View Post
Thank you, amac - going into my bookmarks for sure!
Yeah I book marked it as well...Going into the archives for sure!!!!!
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Old 05-29-2010, 11:45 AM
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Great post! Thanks a bunch.
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Old 06-01-2010, 02:48 AM
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thanks!!!
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Old 06-20-2010, 12:17 PM
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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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Old 06-20-2010, 06:11 PM
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Westcoast 5 your whip looks smooth! Nicely done Player!!!
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Old 06-26-2010, 12:52 PM
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Originally Posted by BlackCherryS View Post
Westcoast 5 your whip looks smooth! Nicely done Player!!!
Thanks
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Old 11-14-2010, 02:38 PM
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The pictures are removed. Can you please upload them again or provide a link. I have to do the same thing to my car and could use the help. Thanks in advance.
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Old 11-14-2010, 02:46 PM
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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/
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Old 12-25-2010, 12:20 PM
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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 12:22 PM.
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Old 12-25-2010, 12:48 PM
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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
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Old 12-25-2010, 12:55 PM
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Originally Posted by ohlord View Post
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
Thanks for the info. Out of curiosity, what happens if you don't do this after installation of the new part. BTW, I've already got my new CPS from Autohaus. They've got some great prices and ship usually the day they receive the order.
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Old 12-25-2010, 01:15 PM
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Worst case

a misfire code. Minor case ??? Nothing.
I think it just speeds up what the ecu would eventually do anyway.
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Old 12-25-2010, 01:18 PM
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Originally Posted by ohlord View Post
a misfire code. Minor case ??? Nothing.
I think it just speeds up what the ecu would eventually do anyway.
Thanks!
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Old 12-26-2010, 05:58 PM
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On point with the CPS pics!!! thanks
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Old 01-04-2011, 01:31 AM
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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
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Old 01-04-2011, 06:12 PM
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Driver side top, back of the engine. Check photo above. You have to remove the plastic engine cover.
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Old 01-04-2011, 06:36 PM
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www.autohausaz.com 42$ plus 10$ ups charge
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Old 01-15-2011, 02:53 AM
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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.
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Old 01-15-2011, 09:31 AM
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Originally Posted by regalchef View Post
www.autohausaz.com 42$ plus 10$ ups charge
Just so you know, spend $50 at Autohausaz and shipping is free.
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Old 03-23-2011, 07:10 PM
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Should have joined here a few months ago. I just had that problem, had to towed and replacement part and labor $285.00. Towing free.
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Old 03-24-2011, 04:14 AM
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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.
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Old 08-21-2011, 04:31 PM
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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".
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