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Help! Cam shaft position sensor / timing issues R171 350

5967 Views 10 Replies 5 Participants Last post by  Sneaky Pete, 
D
Hi all,
Bad news! I took my low mileage 2006 SLK 350 into the garage for a service following the check engine light coming on, and my mechanic has just informed me that he replaced the sensor and it made no difference!!! He said that this is a well known problem with the 350 and that Mercedes may be able to help me as to fix it is nearly an engine rebuild costing thousands. I phoned Mercedes who weren't interested in my problem as no recall has been issued. Anyone else had these sensor/timing issues and able to offer any advice?
Thanks,Debbie
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jbanks15
what were your symptoms?

http://www.slkworld.com/slk-r171-general-discussion/233538-conductor-plate-threads.html

or

http://www.slkworld.com/slk-r171-ge...alance-shaft-sprocket-m272-m273-stickied.html

you get your datacard to check engine range?
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D
Balance shaft sprocket M272. :( The advice from my garage is to put it into a car auction as the repair price is well above it's worth. Not even had it a year yet!!
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jbanks15
get your free datacard to see if your engine is in the range. probably would be. sorry

hindsite, but did you check the engine range before your bought your car?
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jbanks15 said:
get your free datacard to see if your engine is in the range. probably would be. sorry

hindsite, but did you check the engine range before your bought your car?
Click to expand...
Jeff, many thanks for the quick and informative responses. I've just requested a datacard, but in looking at my paperwork it seems my engine is outside of the range...it ends with 493177. And as far as lovely hindsight goes, sadly I hadn't investigated the issue prior to purchase.


MB have offered to plug it in and have a look, but I've just paid £400 for someone to have a look. I can't imagine MB would pick up a different fault code than anyone else who ran the diagnostics.
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i860
£400 for a diagnostic? If you were closer to me i would not mind looking at your slk.
This is the best way to see if your care is affected
or
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jbanks15
if outside range, check out htis if you haven't

http://www.slkworld.com/slk-r171-general-discussion/233538-conductor-plate-threads.html
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Do you know what codes were posted?
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The codes were P1200 and P1208. One sensor was replaced along with the thermostat, but the P1200 code will not clear. I'm off to the local MB garage tomorrow morning for another diagnostic check. I hope they can get to the bottom of it and at least confirm the real issue. I don't want to drive it if it's at risk with this issue. My poor SLK!!
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i860
Keep us posted, but it sounds like a balance shaft problem on your car.
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Sneaky Pete
Wouldn't it be more correct to say this is a problem with the timing chain? Indeed often caused by the balance shaft problem but as the OP's enginenr is outside the effected range couldn't it also be something like a stretched timing chain or a worn chain tensioner? Maybe even more likely? But if it is the balance shaft problem then that's alarming as the enginenr is outside the range. Would mean that maybe a lot more cars could be effected.
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