M157 oil issues and inconsistent lugging
Posted: Tue Apr 21, 2026 12:27 pm
Throughout the four years that I've owned it (I purchased it at 37,000 miles, and I'm currently at 68,000 miles), there has been one persistent problem that I've been unable to fix. Additionally, a new issue has emerged, and I am still unsure as to whether it is connected in any way.
I am driving a brand new, unmodified 2017 S63 M157.
For some reason, every time I turn the throttle between 2000 and 4000 RPM, the car starts lugging and bouncing on the accelerator, at a level of around 40% throttle. Under light or WOT loads, it doesn't matter. The problem went away for almost a thousand miles after I changed the coils and plugs simultaneously; then it came back, although this time it was less severe. After that, the car was taken to the dealership for a second gearbox service and to have everything reset. Expecting it to fix the problem, it failed to do so. An issue has arisen again. At no point throughout this period did the vehicle display any error codes; nevertheless, at the beginning of the current year, when starting the engine, I was startled by a terrifying "Engine Oil pressure stop engine" warning, and the vehicle would rev itself up to idle in an attempt to sustain oil pressure, even though this was perfectly normal. After having the vehicle inspected by a recovery specialist using a xentry tool, the problem was resolved by simply reconnecting the ECU. None of the harness's components contained oil.
Notices regarding the examination are as follows:
"After a thorough investigation, it was determined that there was a short circuit between many sensors and the ground. The output reference voltage for these sensors was also low. After re-connecting the plugs at the main electrical panel, the problem was resolved, and the voltages and actual values of all the sensors are again reading correctly.
Here are the codes:
Reference voltage A circuit for sensors (P0641)
P0237—Sensor for boost pressure A low-pass circuit
The range of the P012C intake air pressure sensor
P2376 - Sensor for turbocharger boost
Every code passed without a hitch.
Basically, just power cycle it.
After reconnecting the ECU, the lugging went away for a few thousand miles, now it's come back. A chilly start upon returning from a 1500-mile journey brought the oil pressure light back on. After the engine warmed up a little, the RPMs returned to normal after dropping below 1,000 and the problem went away on its own.
Codes for this recent incident:
P052400 - Engine oil pressure, no other information available. P227F00 - Air flow limitation in MAF bank 2 and P228000 - Air flow restriction in MAF bank 1.
Everything up to the air filter has been double-checked, and there doesn't appear to be anything amiss. I had to repair the air intake hoses before since they were lately breaking apart.
Despite having the vehicle in for diagnostics at the dealer, nothing has been addressed with the dragging. I feel completely overwhelmed by this situation. Even when I ask, they won't undertake a borescope inspection where I am. The problem may not lie with that, though.
So far, the ECU on/off repair has been effective, and the car is still running smoothly when heated up, with the exception of intermittent dragging.
Thank you in advance for your assistance.
I am driving a brand new, unmodified 2017 S63 M157.
For some reason, every time I turn the throttle between 2000 and 4000 RPM, the car starts lugging and bouncing on the accelerator, at a level of around 40% throttle. Under light or WOT loads, it doesn't matter. The problem went away for almost a thousand miles after I changed the coils and plugs simultaneously; then it came back, although this time it was less severe. After that, the car was taken to the dealership for a second gearbox service and to have everything reset. Expecting it to fix the problem, it failed to do so. An issue has arisen again. At no point throughout this period did the vehicle display any error codes; nevertheless, at the beginning of the current year, when starting the engine, I was startled by a terrifying "Engine Oil pressure stop engine" warning, and the vehicle would rev itself up to idle in an attempt to sustain oil pressure, even though this was perfectly normal. After having the vehicle inspected by a recovery specialist using a xentry tool, the problem was resolved by simply reconnecting the ECU. None of the harness's components contained oil.
Notices regarding the examination are as follows:
"After a thorough investigation, it was determined that there was a short circuit between many sensors and the ground. The output reference voltage for these sensors was also low. After re-connecting the plugs at the main electrical panel, the problem was resolved, and the voltages and actual values of all the sensors are again reading correctly.
Here are the codes:
Reference voltage A circuit for sensors (P0641)
P0237—Sensor for boost pressure A low-pass circuit
The range of the P012C intake air pressure sensor
P2376 - Sensor for turbocharger boost
Every code passed without a hitch.
Basically, just power cycle it.
After reconnecting the ECU, the lugging went away for a few thousand miles, now it's come back. A chilly start upon returning from a 1500-mile journey brought the oil pressure light back on. After the engine warmed up a little, the RPMs returned to normal after dropping below 1,000 and the problem went away on its own.
Codes for this recent incident:
P052400 - Engine oil pressure, no other information available. P227F00 - Air flow limitation in MAF bank 2 and P228000 - Air flow restriction in MAF bank 1.
Everything up to the air filter has been double-checked, and there doesn't appear to be anything amiss. I had to repair the air intake hoses before since they were lately breaking apart.
Despite having the vehicle in for diagnostics at the dealer, nothing has been addressed with the dragging. I feel completely overwhelmed by this situation. Even when I ask, they won't undertake a borescope inspection where I am. The problem may not lie with that, though.
So far, the ECU on/off repair has been effective, and the car is still running smoothly when heated up, with the exception of intermittent dragging.
Thank you in advance for your assistance.