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heard back from the dealership that the harness is bad that the camshaft sensors plug into. They are covering it under CPO and have to special order the harness.
heard back from the dealership that the harness is bad that the camshaft sensors plug into. They are covering it under CPO and have to special order the harness.
Verified customer complain
Run short test
Code for cam sensor
Can sensor connectors have been saturated with oil
Oil run all through wire harness and to the main engine harness
Replace Main engine wire harness
Replaced all four cam sensors and all four cam magnet sensors
Replaced crank sensor, was also saturated with oil
cleaned injectors with electrical cleaner
Injectors were saturated with oil
Cleaned fuel pressure sensor and Main Engine all had oil residue
Connected SDS, connected battery charger, run short test to clear out codes
Performed reset adaption of valves
performed teach in process after replacement of cam magnest and wire harness
Test drove vehicle all functions are okay at the moment.
Runs fine now, seems like a huge job if CPO didn't cover it (they did)
Rebumping this. Wonder if STAR will tell us more than my OBD2 scanner would as far as what to replace exactly. My 2012 CLS63 just started doing this. Low on power and no ECO mode, however CEL is not on. I do have the same two codes though and no warranty of any kind.
Last edited by 6speeddave; 10-31-2017 at 10:14 PM.
Star will give you a lot of info on why eco mode is not in a ready state. Always worth looking around the 4 camshaft position sensors for oil residue and disconnecting the ecu and checking to see if there is any oil on the pins.
Update. And looking for some advice as this issue may be brought up here in the near future as these cars get out of warranty and mileage gets up there. My 2012 CLS63 has just shy of 70,000 miles on it. After the symptoms above over the last 2 days I just pulled things apart this afternoon. All 4 of the upper Camshaft position sensors were wet with oil. The oil hasn't made it up the harnesses though, at least from what I can tell. I also checked the ECU and that is completely dry. I also pulled the lower solenoid sensors and at first they looked dry but after looking closer they had a slight bit of oil in them.
My question to you guys is regarding the replacement of all 9 of these sensors. Is there a procedure in STAR that will need to be done after they are installed to properly get them working with the car? Is the replacement process straight forward?
I would imagine most if not all of these M157 motors will see this happen at some point in the lifetime of the car so thanks for any input you guys may have on this.
Last edited by 6speeddave; 11-02-2017 at 02:25 PM.
My 2012 cls63 has around 92k miles and so far one camshaft position sensor leaked, oil made its way up to the ecu pins but caught it before I had any issues. There is an updated part number for these sensors so make sure to get the latest one. Easiest way is to input the part number on the sensor into a benz parts website and it should direct you to the later part. The oil on the pins could cause all sorts of weird issues so make sure to consistently check the pins and clean them with a q tip because you will not be able to clean all the oil that was wicked up in the wire on the first try.
The sensors should be plug and play so you shouldn't need star, but just to be sure keep power off the ecu when you are replacing these.
Heres what I ordered:
(4) 276-905-10-00 Camshaft Position Sensor (Updated number)
(4) 276-156-07-90 Camshaft Control Valve Solenoid
(1) 276-905-12-00 Crankshaft Position Sensor (figure I may as well change it)
Also just went out and sprayed electrical contact cleaner on all 8 sensor plugs and harness connectors to free any of the oil on them. Will plug back everything back in in an hour or so and do a test drive to see if it helped remedy the problem for a bit until the new parts arrive.
Does anyone know if I need some sort of special tool when replacing the front solenoids? These solenoid sensor housings seem to be the same for tons of various Benz cars. Part no. 2761560790
Alright put everything back together and CEL and codes came right back. So pretty much out of luck until I get the new sensors installed. Plan on doing the top 4 first even though my code is only for Bank 2 sensor A
And another update. Found oil at ECU connection and in the injector harnesses as well. Looks like I will need to order a new harness for about $1,000. Its not the price that sucks but more the timeframe. Im told it could be months. I know the OP had his in a week or so so hoping the same.
Point being, if you have an M157 car, or even M278, and you still have your original cam position sensors, order the revised replacements ASAP before your oil finds its way in. We need to really get this out there. The sensors are $35 / pop at discounted sources and can be replaced in about 10 minutes for all 4. Neglect it and you'll find a $1,300 parts bill plus labor. This isn't something mechanics or even a PPI would find in a pre purchase, but again can be diagnosed in 3 minutes or less.
Last edited by 6speeddave; 11-06-2017 at 12:13 AM.
Why not just clean the harness? I know its tedious but the oil doesn't damage the wiring itself so the harness should be functional. Most of the electrical components are covered with protective epoxy of some kind so it would take a lot of oil to cause any damage, maybe just temporary issues.
Why not just clean the harness? I know its tedious but the oil doesn't damage the wiring itself so the harness should be functional. Most of the electrical components are covered with protective epoxy of some kind so it would take a lot of oil to cause any damage, maybe just temporary issues.
Its definitely something I thought about. I guess my only thing is, even if I clean the connectors and replace most of the sensors, it will be hard to keep tabs on the oil problem down the road since there would still be oil all over the harness and dropping back into those sensors. There would be no way to tell if oil is getting back in through the sensor in the future, or if its just oil from before. For $1,000 it isn't too bad of cost. My independent just came by and we both agree that its pretty straight forward its just there are some unknowns regarding what other small things will need to be replaced with the new harness. Dealer says most of the clips and things you'll need come with the harness, but if I need to remove the intercooler or intake manifold, the necessary gaskets with those. We couldn't find a WIS document that showed the harness replacement. May just have to tear into it and replace things as we go. Downside to all this is it's my only car.
Last edited by 6speeddave; 11-05-2017 at 05:23 PM.
If the OP had any way to access the repair invoice that his dealer submitted when he had all this repaired under warranty, that would be worth its wait in gold. Should show every part / gasket they had to order to replace all 9 sensors and the harness which is what I plan to do as well.
Just spoke to a friend with a 2012 CLS63 with 76,000 miles and sure enough he has oil at all 4 cam sensors as well as at the ECU. In other words, I highly recommend everyone look at their car as well and order the revised sensors ASAP before more oil makes its way in.
Revised sensors on order have an estimated arrival date of December 2nd. So going to order the existing design sensors (2761530028) for $140 for all 4 and use those until then as well as do daily cleanings at the ECU and other connectors.
Last edited by 6speeddave; 11-06-2017 at 01:53 PM.
Update. Got the replacement sensors in and codes are gone, cars running good. Going to wait for the revision part number sensors to show up in 3-4 weeks. Will put those in and continue to monitor oil at all harness connections.
10-12-2016, 01:16 PM
