When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Hey guys, I'm really in need of some help here... I recently bought a 2010 e350 w212 that was in great condition. Ran great, no problem for about a month and then boom, engine is misfiring and now throwing all sorts of codes including: P2090, P2088, P0343, and P0368...
I use to have a 2006 c230 with the M272 so was pretty familiar with the camshaft adjuster sensors / actuator magnets so replaced all of them, replaced all the spark plugs and ignition coils, fired her up and am still having the same issues!
I did notice that on two of the camshaft adjuster magnet connectors there was oil, I cleaned it up as best I could but did read that maybe that can hurt the ecu? How would I check this?
Any other ideas/experience on how to solve this issue?
Thanks!
Caleb
Last edited by ostmcaleb; Jul 2, 2025 at 04:42 PM.
Hey guys, I'm really in need of some help here... I recently bought a 2010 e350 w212 that was in great condition. Ran great, no problem for about a month and then boom, engine is misfiring and now throwing all sorts of codes including: P2090, P2088, P0343, and P0368...
I use to have a 2006 c230 with the M272 so was pretty familiar with the camshaft adjuster sensors / actuator magnets so replaced all of them, replaced all the spark plugs and ignition coils, fired her up and am still having the same issues!
I did notice that on two of the camshaft adjuster magnet connectors there was oil, I cleaned it up as best I could but did read that maybe that can hurt the ecu?
How would I check this?
Any other ideas/experience on how to solve this issue?
Thanks!
Caleb
Oil in your engine harness needs to be stopped ASAP :
-- stopped at the head source sensors
-- stopped at the destinations: ECU/Lambdas/O2
What are your fault codes related to?
A little early oil at ECU is ok.
Oil swamped is non-salvageable: (ECU + Harness)
It began with the following codes: P0300, P0301, P0303, P0302, P0343, P0261, P0267, P0264, P2090, P2088
I thought it would be a fairly easy fix, replaced all camshaft position sensors, camshaft adjuster magnets, ignition coils and spark plugs. (all with OEM parts).
Then I fired it back up and received even more codes: P2090, P2088, P0101, P0343, P0368, P07E8, P0A03, P0103, P0202, C2420, B1020, P0368...
Has anyone ever experienced this before? My limited research does show that oil leaking through the camshaft position sensors can travel up the harness and wreck the ECU.
This all started a couple days ago so I'm hoping that maybe it can be salvageable. What a nightmare...
It began with the following codes: P0300, P0301, P0303, P0302, P0343, P0261, P0267, P0264, P2090, P2088
I thought it would be a fairly easy fix, replaced all camshaft position sensors, camshaft adjuster magnets, ignition coils and spark plugs. (all with OEM parts).
Then I fired it back up and received even more codes: P2090, P2088, P0101, P0343, P0368, P07E8, P0A03, P0103, P0202, C2420, B1020, P0368...
Has anyone ever experienced this before? My limited research does show that oil leaking through the camshaft position sensors can travel up the harness and wreck the ECU.
This all started a couple days ago so I'm hoping that maybe it can be salvageable. What a nightmare...
I appreciate any and all help or suggestions.
Thanks,
Caleb
you should post the english description of the list codes you want to consider.
This much fault can't happen really soon after oil leak starts.
Ok no problem, here are all the codes in their entirety:
P0300 - Random / multiple cylinder misfire detected
P0301 - Cylinder 1 misfire detected
P0303 - Cylinder 3 misfire detected
P0302 - Cylinder 2 misfire detected
P0343 - Camshaft position sensor A circuit High Bank 1 or single sensor (this is why I thought to replace all the camshaft position sensors)
P0261 - Cylinder 1 injector circuit low
P0267 - Cylinder 3 injector circuit low
P0264 - Cylinder 2 injector circuit low
P2090 - b Camshaft position actuator control circuit low bank 1c (this is why I replaced all the camshaft adjuster magnets)
P2088 - A camshaft position actuator control circuit low bank 1b - (see above comment)
However after replacing all camshaft position sensors and camshaft adjuster magnets along with all new ignition coils and spark plugs, I'm now getting:
P2090 - b Camshaft position actuator control circuit low bank 1c
P2088 - A camshaft position actuator control circuit low bank 1b
P0101 - mass or volume air flow A circuit range performance
P0343 - Camshaft position sensor A circuit High Bank 1 or single sensor
P0368 - Camshaft position sensor b circuit high bank 1
P0A03 - Motor electronics coolant temperature sensor circuit high
P0103 - mass or volume air flow a circuit high
P0202 - injector circuit / open cylinder 2
C2420 - Manufacturer control
B1020 - manufacturer control
P0368 - camshaft position sensor B circuit high bank 1
Anybody ever gone through anything like this before?
Right now you want to sort out latest faults. Clear existing and rescan.
Lets not mess with the batteries.
the weird part is injectors faults are involved...
alrighty well in between posts I unplugged the battery, waited a few minutes, hooked it back up, cleared all the codes with my scanner, started the car and it fires up but runs super rough and starts throwing check engine lights and codes again:
P0301 cylinder 1 misfire
P0303 cylinder 3 misfire
P0302 cylinder 2 misfire
P2090 b camshaft position actuator control circuit low bank 1c
P2088 a camshaft position actuator control circuit low bank 1b
P0343 camshaft position sensor a circuit high bank 1 or single sensor
P0368 camshaft position sensor b circuit high bank 1
p0368 camshaft position sensor b circuit high bank 1
alrighty well in between posts I unplugged the battery, waited a few minutes, hooked it back up, cleared all the codes with my scanner, started the car and it fires up but runs super rough and starts throwing check engine lights and codes again:
P0301 cylinder 1 misfire
P0303 cylinder 3 misfire
P0302 cylinder 2 misfire
P2090 b camshaft position actuator control circuit low bank 1c
P2088 a camshaft position actuator control circuit low bank 1b
P0343 camshaft position sensor a circuit high bank 1 or single sensor
P0368 camshaft position sensor b circuit high bank 1
p0368 camshaft position sensor b circuit high bank 1
I did just install a new head unit screen thing, there’s no way that could be related right?
im going to buy some of that electronic cleaner spray and throughly clean the connectors that had oil in them. The pigtail connectors on the actuator magnets were clean, two of the camshaft adjuster sensor connectors had a bit of oil in the harness.
maybe just maybe that will solve things.
otherwise I guess I might need a new harness and hopefully not a new ECU…
im going to buy some of that electronic cleaner spray and throughly clean the connectors that had oil in them. The pigtail connectors on the actuator magnets were clean, two of the camshaft adjuster sensor connectors had a bit of oil in the harness.
maybe just maybe that will solve things.
otherwise I guess I might need a new harness and hopefully not a new ECU…
busy fault collection
Oily CPS do not do all that.
I can hardly say ECU even though it's a suspect.
What did you disturb while doing this job ??
At least injectors faults did not come back
alrighty well in between posts I unplugged the battery, waited a few minutes, hooked it back up, cleared all the codes with my scanner, started the car and it fires up but runs super rough and starts throwing check engine lights and codes again:
P0301 cylinder 1 misfire
P0303 cylinder 3 misfire
P0302 cylinder 2 misfire
P2090 b camshaft position actuator control circuit low bank 1c
P2088 a camshaft position actuator control circuit low bank 1b
P0343 camshaft position sensor a circuit high bank 1 or single sensor
P0368 camshaft position sensor b circuit high bank 1
p0368 camshaft position sensor b circuit high bank 1
this looks like an engine electrical issue...
either all those connectors got messed up wholesale
a common fuse got popped.
At least this is getting well defined.
CYL4 is not misfiring
I bet misfiring will go away with good/working CPS.
Can you compare old vs. new CPS sensors??
Last edited by CaliBenzDriver; Jul 3, 2025 at 12:09 AM.
I cleaned the sensor connections once more, even took off the sacrificial pigtails on the camshaft adjuster magnet connections, then took off the ECU and cleaned the ECU sensor, there was oil in there... it wasnt dripping, but when I went to spray it down with electrical cleaner it dripped a light brown color...
I'm starting to think this wiring harness is toast and possibly the ECU...
After cleaning it all once more it started up like normal and even idled for a minute or so completely fine before it started throwing the same codes and misfiring again...
What do yall think? do you agree with my assessment?
Yeah, you're running out of good options... did you say the ECU got little bit of oil or a generous amount of oil ?
the ECU was a bit shimmery on the connections but not dripping or pooling, however when cleaning it with electrical cleaner it was a steady light brown run off…
they are not particular easy to open up - Need tools to open the case.
also need to renew thermal paste before closing back the case
There are fully soldered to stay reliable.
The only thing bad is they are located in the very hotest place possible: either the engine top or above the exhaut pipes.
That means replacement parts must be high standards.
they are not particular easy to open up - Need tools to open the case.
also need to renew thermal paste before closing back the case
There are fully soldered to stay reliable.
The only thing bad is they are located in the very hotest place possible: either the engine top or above the exhaut pipes.
That means replacement parts must be high standards.
Well, the search continues, I got a used ECU, had it cloned by a local shop and am still getting the same codes and issues!
im really stumped now… scared that the timing is messed up or something? Any ideas?
driving down the road everything was fine, early into my journey and all a sudden car starts misfiring and goes into limp mode.
it allows me to barely putter back to my house which thankfully wasn’t far away.
I pull out my cheap scanner and get the following codes:
p2090 - camshaft position actuator control circuit low bank 1c
p2088 - camshaft position actuator control circuit low bank 1b
p0343 - camshaft position sensor a circuit high bank 1 or single sensor
p0368 - camshaft position sensor b circuit high bank 1
I think back to my previous experience with a 2006 m272 and remember having to replace the camshaft position sensors and camshaft adjuster magnets. No big deal fairly easy.
I order Bosch and Mercedes parts and replace all camshaft position magnets and camshaft adjuster magnets.
while I’m at it I replace all engine coils and all spark plugs, as this car is new to me (only had it a month) and has 106k miles.
i fire it back up after doing all the above and the same codes appear.
i read the forums and see the issue with oil in harness and ECU. I did notice a little oil in two of the position sensor harness connections and a little glaze at the ECU connection. I thoroughly clean all out with electrical component cleaner.
There was a few minutes after putting all back where the engine started and seemed to idle correctly but then it went back to the same issues and codes.
I then order a ECU off eBay, had it cloned, popped it in expecting everything to be better but the same codes and issues persist.
I suppose it could be the wiring harness itself? Or something entirely different…
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
