Research Merceds oil migration. This is a very documented and well known issue on modern Mercedes engines. I had this issue on a m276 (v6). The owner of the M157 vehicle I bought was worried about the same thing. The issue: oil travels throughout copper electrical wiring including up and to the main ECU. Solution: Replace the cam position sensors and timing magnets. 4x of each. Cheap parts. Not too difficult install
@@ViperMike It is not specific to m157. It seems to happen on a lot of mid 2010 Mercedes motors. Cam sensors are on top of valve covers. Easy. The 4 magnets are on the front of cams and take a bit more time to replace. On higher mileage motors it is worth the effort as you can clearly see oil in electrical wiring where it should not be. Rumor is that eventually it ends up in the Engine ECu and then you have a big $$ fix.
@@ianmccormick247 yeah definitely seeing oil inside connectors is strange. Definitely shouldn’t be there. I actually just filmed another video today changing the O2 sensor and that connector had oil inside it too
You shouldn't be messing with the pumps yet. The car is literally showing you were the issue is, check the injectors of cylinders 1 and 4, the coils and the spark plugs, check if the spark plug cables are good, but for me is impossible at this point that the issue is related to fuel pressure, because otherwise you wouldn't be having a so focused problem in the ECU scan. Greetings from Colombia. You're doing great. 💪🏻💪🏻
i would check the main things first plugs coil wires first \ but theres a way to check the selonoids thats atach to the pump unsrew it from the pump send 12v and ground to it see if the plunger go in and out thats it
Research Merceds oil migration. This is a very documented and well known issue on modern Mercedes engines. I had this issue on a m276 (v6). The owner of the M157 vehicle I bought was worried about the same thing. The issue: oil travels throughout copper electrical wiring including up and to the main ECU. Solution: Replace the cam position sensors and timing magnets. 4x of each. Cheap parts. Not too difficult install
Interesting, haven’t heard of that issue. Will definitely look into it.
@@ViperMike It is not specific to m157. It seems to happen on a lot of mid 2010 Mercedes motors. Cam sensors are on top of valve covers. Easy. The 4 magnets are on the front of cams and take a bit more time to replace. On higher mileage motors it is worth the effort as you can clearly see oil in electrical wiring where it should not be. Rumor is that eventually it ends up in the Engine ECu and then you have a big $$ fix.
@@ianmccormick247 yeah definitely seeing oil inside connectors is strange. Definitely shouldn’t be there. I actually just filmed another video today changing the O2 sensor and that connector had oil inside it too
Can confirm this too, new sensors have improved sealing
You shouldn't be messing with the pumps yet. The car is literally showing you were the issue is, check the injectors of cylinders 1 and 4, the coils and the spark plugs, check if the spark plug cables are good, but for me is impossible at this point that the issue is related to fuel pressure, because otherwise you wouldn't be having a so focused problem in the ECU scan.
Greetings from Colombia. You're doing great. 💪🏻💪🏻
It ended up being the O2 sensor, injectors are fine. Next video will explain
i would check the main things first plugs coil wires first \ but theres a way to check the selonoids thats atach to the pump unsrew it from the pump send 12v and ground to it see if the plunger go in and out thats it
if one seloniod is bad u will have missfire my opinion from jamaica