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Please forgive my ignorance; I have been reading various related threads and find myself very confused.
I have a 2016 E400 coupe (C207), which I believe is the M276 engine - is that correct?
The "Camshaft Control Valve Solenoid" part number on my engine is 276-156-07-90, which replaced old part number 276-156-04-90. Is this newer, replacement part designed to address the oil-in-the-wiring-harness problem, or is my engine still susceptible to this?
Last edited by Mr. Toad; Aug 23, 2022 at 10:04 AM.
Please forgive my ignorance; I have been reading various related threads and find myself very confused.
I have a 2016 E400 couple (C207), which I believe is the M276 engine - is that correct?
The "Camshaft Control Valve Solenoid" part number on my engine is 276-156-07-90, which replaced old part number 276-156-04-90. Is this newer, replacement part designed to address the oil-in-the-wiring-harness problem, or is my engine still susceptible to this?
There is no documentation that MB “designed the latest parts to solve” the leak issue.
Posters on this site seem to have fewer/no problems with the latest part number in the EPC system.
Can anyone tell me the orientation of the wiring connection on the old part number 276-156-04-90? My engine has the revised 276-156-07-90 part and the plugs connect at the top of the Camshaft Control Valve Solenoids. I'm just wondering whether the point (e.g., top, side, or bottom) at which the wiring connects to the solenoid might have an impact on the potential for leaked oil to creep into the harness.
Can anyone tell me the orientation of the wiring connection on the old part number 276-156-04-90? My engine has the revised 276-156-07-90 part and the plugs connect at the top of the Camshaft Control Valve Solenoids. I'm just wondering whether the point (e.g., top, side, or bottom) at which the wiring connects to the solenoid might have an impact on the potential for leaked oil to creep into the harness.
I don't understand the question. Replacement sensors or magnets install only one way - the factory way. What am I missing?
The theory on the table is that the cam position sensors fail by allowing oil to escape the sensor body, onto the sensor pins. From there the oil migrates to the harness terminals, and via capillary action into the harness.
Gravity does not play a role in capillary action. Capillary action is what transports the oil from the failed sensor to the ECU, injectors and O2 sensors.
A lot of great info in this thread... I'm going through this now with my 2015 S550 Coupe, I had purchased it last month with 40k miles, lucky for me the dealer is covering it all, I'm told it's close to a 9k job since they have to pull the engine out.
I don't understand the question. Replacement sensors or magnets install only one way - the factory way. What am I missing?
As noted in my previous post, my engine has revised part # 276-156-07-90 (Camshaft Control Valve Solenoid), which replaced old part # 276-156-04-90. The redesigned part mounts with the electrical connecting plug facing up. I don't know what the orientation was on the old part, and I was simply asking whether the upward orientation might impact oil ingress into the wiring harness.
As noted in my previous post, my engine has revised part # 276-156-07-90 (Camshaft Control Valve Solenoid), which replaced old part # 276-156-04-90. The redesigned part mounts with the electrical connecting plug facing up. I don't know what the orientation was on the old part, and I was simply asking whether the upward orientation might impact oil ingress into the wiring harness.
Oil escapes from the engine via a failed sensor or solenoid. It then migrates through the harness via capillary action. Capillary action is unaffected by gravity. You are asking if gravity affects oil migration. Gravity does not affect oil migration when the mechanism is via capillary action, as it is in this case.
Do you hold the belief that the original part had an orientation different than the part in your engine?
I don't know about the orientation of the original part, hence my question. As they decided to replace the original with a redesigned version, I'm wondering if perhaps the positioning of the connector was part of the revision. On my engine, the connector is at the top of the solenoid as seen in the picture you attached.
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