M-Class (W163) Produced 1998-2005: ML 230, ML 320, ML 350, ML 400 CDI, ML 430, ML 500, ML 270 CDI

How do you change the CPS?

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Old Feb 26, 2007 | 07:29 PM
  #1  
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a POS
How do you change the CPS?

I've researched this site and discovered that many of you have the same problem that I have: does not start, then come back in 15-20 minutes and starts right up, once started it runs fine, no codes.

So the concensus seems to be the Crankshaft Position Sensor. I've checked with my dealer and they have a replacement for $142.80 and will pick it up today.

My question is: where is the sensor located on the engine and is it easy to replace on my own? i.e. no special tools? i would assume its on the balancer/damper or pulley. i hope its not on the flywheel side of the motor.

i'm a pretty good wrench turner as i've tinkered with cars since i was 10 so skill wise, i'd say i'm capable. i just want some idea as to where the sensor is and what its going to take before i break out the tools.

Thanks a bunch!

Morris
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Old Feb 26, 2007 | 07:49 PM
  #2  
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1967 Morris Cooper "S", 1983 911SC, 1997 Toyota Tacoma, 1999 HD FXSTB, 1998 C43
Bad news on the V8 it is, it's not tough to replace though. I need to add that I dunno what engine you have. On my 113 motor (C43 - V8) it's on the driver's-side bell housing (top side of the motor). The bell housing is the flywheel housing in case that makes no sense to you. You will need a torx or allen bit, although off-hand I cannot remember the size. I remember using a 1/4" ratchet along with a couple extensions - I hope you have small hands, it helps.

I replaced mine pre-emptively since I was aware of the what happens if it fails.

Last edited by StapleGun; Feb 26, 2007 at 07:56 PM.
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Old Feb 26, 2007 | 08:36 PM
  #3  
azinn's Avatar
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From: In A Van Down By The River
2014 RX 350 F Sport, 2007 Scion tC, 2000 ML 430 Money Pit Finally Gone! Oh Happy Day!
Originally Posted by mr1320
I've researched this site and discovered that many of you have the same problem that I have: does not start, then come back in 15-20 minutes and starts right up, once started it runs fine, no codes.

So the concensus seems to be the Crankshaft Position Sensor. I've checked with my dealer and they have a replacement for $142.80 and will pick it up today.

My question is: where is the sensor located on the engine and is it easy to replace on my own? i.e. no special tools? i would assume its on the balancer/damper or pulley. i hope its not on the flywheel side of the motor.

i'm a pretty good wrench turner as i've tinkered with cars since i was 10 so skill wise, i'd say i'm capable. i just want some idea as to where the sensor is and what its going to take before i break out the tools.

Thanks a bunch!

Morris
See http://www.mercedesshop.com/shopforu...ps+replacement
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Old Feb 26, 2007 | 11:41 PM
  #4  
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a POS
THANKS!!!!

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Old Mar 5, 2007 | 06:09 PM
  #5  
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a POS
ok, i finally changed the CPS. no one told me that you needed to use The Force to replace it... hahaha... i couldn't even see the sensor. its behind the driver's side cylinder head and had to go completely by feel. anyway, i did it and so far no problems. we'll wait a week before celebrating.
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Old Mar 15, 2007 | 01:26 PM
  #6  
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From: Irvine, CA
a POS
Two weeks straight with no starting problems. I guess the problem is solved. Damn you CPS!!!!

Without this forum, I would have never guessed it was the CPS. Thanks guys.
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Old Mar 15, 2007 | 04:31 PM
  #7  
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From: In A Van Down By The River
2014 RX 350 F Sport, 2007 Scion tC, 2000 ML 430 Money Pit Finally Gone! Oh Happy Day!
Originally Posted by mr1320
Two weeks straight with no starting problems. I guess the problem is solved. Damn you CPS!!!!

Without this forum, I would have never guessed it was the CPS. Thanks guys.
Great............. good job, good to here it worked. Makes a person feel real good when they can DIY.
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