M271 Leaking Cam Sensors
MBWorld Fanatic!
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From: Nashua, NH
2008 VW GTI
https://mbworld.org/forums/c-class-w203/237667-m111-leaky-cam-sensor-replacement.html
Junior Member
Joined: Jun 2004
Posts: 66
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From: Connecticut
2005 C230 Sport Sedan w/Automatic
So I took the car to the dealer ship on Saturday, partly because my right tail lamp mysteriously went out and partly because of this thread. I know the SA there so I told him straight up no oil but asked if they would check the cam sensors anyways.
Good news first: There is a campaign to upgrade all bulbs, had all my bulbs replaced to "long lasting extended use" bulbs...whatever that means. All I care is my right rear tail lamp works again so no more worry bout mr. po po pulling me over.
Bad news: The cam sensor wire extension was not performed as no evidence of leakage was found
(I wish they would have just done it anyways!)
Good/Bad news: Tranny was leaking. Replaced all sorts of seals, rings, etc. Also replaced parking detent attached to rear cross-member support and hydraulic something or other (don't have my invoice with me and can't quite remember). Good news is they fixed it all for free under warranty, bad news is it happened in the first place.
Anyone else have a tranny leak on them?
Good news first: There is a campaign to upgrade all bulbs, had all my bulbs replaced to "long lasting extended use" bulbs...whatever that means. All I care is my right rear tail lamp works again so no more worry bout mr. po po pulling me over.
Bad news: The cam sensor wire extension was not performed as no evidence of leakage was found
(I wish they would have just done it anyways!)Good/Bad news: Tranny was leaking. Replaced all sorts of seals, rings, etc. Also replaced parking detent attached to rear cross-member support and hydraulic something or other (don't have my invoice with me and can't quite remember). Good news is they fixed it all for free under warranty, bad news is it happened in the first place.
Anyone else have a tranny leak on them?
As far as the transmission, I had the exact same leak. They did the whole parking detent thing as well. At 2,000 miles I had the "normal' transmission connector leak, but then later I had the parking detent leak. I wonder if this will crop up with other owners.
Leif W.
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From: Los Angeles
2005 C230 SS
Member
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this may sound like a silly question.. but i did the m271 cam adjuster/sensor change + wiring harness patch at the dealership about a month back.
does that mean i dont have to pull the plugs off and use contact cleaner on them? does the wiring harness patch isolate the oil leak problem?
does that mean i dont have to pull the plugs off and use contact cleaner on them? does the wiring harness patch isolate the oil leak problem?
Thread Starter
MBWorld Fanatic!
Joined: Dec 2003
Posts: 3,275
Likes: 236
From: BC, Canada
2003 C230K Coupe Orion Blue
^ Depends on how far the damage is.
My had just *started* leaking, so there were only a few drops, nowhere near the 1-2L mark like some other users here. You need to ask your SA the extent of the leak in your car. If your cables are clean, then there's no need to look at the plugs or ECU; your SA would've done that for you. (I double-checked my ECU; it was completely dry)
Yes the patch isolates the leak, so if your cables are clean, then consider yourself lucky
My had just *started* leaking, so there were only a few drops, nowhere near the 1-2L mark like some other users here. You need to ask your SA the extent of the leak in your car. If your cables are clean, then there's no need to look at the plugs or ECU; your SA would've done that for you. (I double-checked my ECU; it was completely dry)
Yes the patch isolates the leak, so if your cables are clean, then consider yourself lucky
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^ Depends on how far the damage is.
My had just *started* leaking, so there were only a few drops, nowhere near the 1-2L mark like some other users here. You need to ask your SA the extent of the leak in your car. If your cables are clean, then there's no need to look at the plugs or ECU; your SA would've done that for you. (I double-checked my ECU; it was completely dry)
Yes the patch isolates the leak, so if your cables are clean, then consider yourself lucky
My had just *started* leaking, so there were only a few drops, nowhere near the 1-2L mark like some other users here. You need to ask your SA the extent of the leak in your car. If your cables are clean, then there's no need to look at the plugs or ECU; your SA would've done that for you. (I double-checked my ECU; it was completely dry)
Yes the patch isolates the leak, so if your cables are clean, then consider yourself lucky
anyways, they cleaned all the wires out when they replaced the cam adjuster/sensors and wiring harness, nothing on the wires yet.. should i be worried??
the ecu is on top left of the block right? so just pop open the cover and see if there is any oil in there??
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From: WNY
2005 w203 C230
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Joined: Oct 2007
Posts: 537
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From: Charlotte, NC
2013 S550, CLS500, ‘03 SL500, “92 190E Sportline
Can the cam sensors and isolating wires be purchased anywhere online? I can't seem to find them, even with the part numbers. I even checked trademotion. 
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Newbie
Joined: Apr 2008
Posts: 11
Likes: 0
2005 C180K
I dont know if I am paranoid or not, but,
my Mercedes Benz Specialist changed these two wires for me with updated versions (bought by me from Mercedes Benz Cyprus) that supposedly will not cause any oil leaks, even though my current wires were clean and looked as new.
Change took him five minutes to do.
After the wire change, I experienced some kind of power reduction, not massive, but noticeable.
Any views on this?
my Mercedes Benz Specialist changed these two wires for me with updated versions (bought by me from Mercedes Benz Cyprus) that supposedly will not cause any oil leaks, even though my current wires were clean and looked as new.
Change took him five minutes to do.
After the wire change, I experienced some kind of power reduction, not massive, but noticeable.
Any views on this?
Super Member
Joined: Oct 2007
Posts: 537
Likes: 2
From: Charlotte, NC
2013 S550, CLS500, ‘03 SL500, “92 190E Sportline
Thanks! I purchased the parts I needed on that site. Does anyone know the part number for the Engine Wire harness for the M271? Where exactly is it located?
Last edited by aolsen; Jun 28, 2008 at 07:33 PM.
Newbie
Joined: Apr 2008
Posts: 11
Likes: 0
2005 C180K
My MB specialist (since car is out of warantee) changed just two wires:
2 X 2711502733 and they write on them:
DELPHI SLOVAKIA WERK
SENCIA DZ2SK
ZD 07.07.03
FD 23.04.08
These seem to be the correct wires, but, how come I get slightly reduced power?
2 X 2711502733 and they write on them:
DELPHI SLOVAKIA WERK
SENCIA DZ2SK
ZD 07.07.03
FD 23.04.08
These seem to be the correct wires, but, how come I get slightly reduced power?
Newbie
Joined: Apr 2008
Posts: 11
Likes: 0
2005 C180K
i had the parts for a few weeks now, found the time to do it today, was on my 2004 C230 that is out of warranty, was some very minor oil seepage there. i am going to inspect the connectors on my 2005 C230 that is still under warranty tonight, i bought two sets of cables and 4 tie straps, here are a few pictures. the way i attached mine a little different than shown above, they clear the plastic cover just fine and are far from the Belt.
these two cables, costing as much as they do, is pure robbery btw. WHAT is MB thinking??
They make a mistake and then they want all buyers to spend at least 100$ on a pair of wires, that should cost most probably 10$ each.
Senior Member
Joined: Mar 2008
Posts: 358
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From: San Pedro CA and Costa Mesa CA
2005 W203 SS
maybe this could explain my car runing rich on gas? and oil burning between serives? its been asking for 1 quart of oil in between services and the tips of my exhas has too much back residue... and dont get me started on gas.. my mpg has been going down, my car is still under extended warenty, im going in to let them know about this oil on cam sensors... anything else i should let the stealer know?
thanks!
thanks!
Thread Starter
MBWorld Fanatic!
Joined: Dec 2003
Posts: 3,275
Likes: 236
From: BC, Canada
2003 C230K Coupe Orion Blue
maybe this could explain my car runing rich on gas? and oil burning between serives? its been asking for 1 quart of oil in between services and the tips of my exhas has too much back residue... and dont get me started on gas.. my mpg has been going down, my car is still under extended warenty, im going in to let them know about this oil on cam sensors... anything else i should let the stealer know?
thanks!
thanks!
I get about 560 (typical) - 640 (best record) km between tanks, with 95% city driving. How about you guys?
Last edited by slammer111; Jun 10, 2018 at 03:08 AM.
Super Member
Joined: Oct 2007
Posts: 537
Likes: 2
From: Charlotte, NC
2013 S550, CLS500, ‘03 SL500, “92 190E Sportline
Funny you should mention this, I just did my own Service A the other day and it looks like my engine ate up 1.4L of oil in the last 15000km. I already had the cam sensors + isolation wires done earlier in the year, so maybe it's normal for the M271 to eat oil. And my exhaust tips have been turning black since Day 1.
I get about 560 (typical) - 640 (best record) km between tanks, with 95% city driving. How about you guys?
Ed
I get about 560 (typical) - 640 (best record) km between tanks, with 95% city driving. How about you guys?
Ed
Senior Member
Joined: Mar 2008
Posts: 358
Likes: 0
From: San Pedro CA and Costa Mesa CA
2005 W203 SS
Funny you should mention this, I just did my own Service A the other day and it looks like my engine ate up 1.4L of oil in the last 15000km. I already had the cam sensors + isolation wires done earlier in the year, so maybe it's normal for the M271 to eat oil. And my exhaust tips have been turning black since Day 1.
I get about 560 (typical) - 640 (best record) km between tanks, with 95% city driving. How about you guys?
Ed
I get about 560 (typical) - 640 (best record) km between tanks, with 95% city driving. How about you guys?
Ed
Super Member
Joined: Oct 2007
Posts: 537
Likes: 2
From: Charlotte, NC
2013 S550, CLS500, ‘03 SL500, “92 190E Sportline
So guys, what happens after we install the new cam sensors and isolating wires? What happens if some oil had already leaked through the connectors? Would it eventually dry up, or continue towards the ECU?
Super Member
Joined: May 2008
Posts: 573
Likes: 1
W203
Here are pics of the sensors (from page one):
https://mbworld.org/forums/showpost....1&postcount=13
There are 3 bolts per sensor, and 1 connector per sensor. Disconnect the sensor and check for oil in the connector. If there's oil, order the part numbers listed, remove the 3 bolts, replace the connector, add the isolation wire, and you're done.
Almost a Member!
Joined: Jun 2008
Posts: 33
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2005 c230k sedan
Please read the whole thread.
Here are pics of the sensors (from page one):
https://mbworld.org/forums/showpost....1&postcount=13
There are 3 bolts per sensor, and 1 connector per sensor. Disconnect the sensor and check for oil in the connector. If there's oil, order the part numbers listed, remove the 3 bolts, replace the connector, add the isolation wire, and you're done.
Here are pics of the sensors (from page one):
https://mbworld.org/forums/showpost....1&postcount=13
There are 3 bolts per sensor, and 1 connector per sensor. Disconnect the sensor and check for oil in the connector. If there's oil, order the part numbers listed, remove the 3 bolts, replace the connector, add the isolation wire, and you're done.
Last edited by detroityianni; Jul 31, 2008 at 01:01 PM.
