W204 OM646 Injector Leak

[mattehardware]

Actually I don't mean deposits in the injectors. But the sludge underneath it pushed the fuel back out of the engine block. He didn't take the engine apart. The kilometers traveled confirm this thesis, the engine must be disassembled and repaired, starting from the head. Something is wrong, especially if Xentry does not give errors, this is an internal mechanical defect and sludge can be when Xentry does not give errors. I am talking about the experience of owning a W176 (420,000) with the same problem. We were in complete despair, but after reworking the engine head, the problem was solved.

 

[nano5849]

Could a bad O2 sensor be the cause of this leak and higher pressure? Today the check engine light came on and I saw this O2 sensor error using Xentry: 23E2-015 Check component G3/2 (Oxygen sensor upstream of catalytic converter).
CURRENT and STORED.

As far as I know, the O2 sensor is critical for LTFT and STFT. Can you clarify if the problem occurs when the engine is cold? And after it reaches 90 degrees Celsius, please clean the fuel leak and test run to see if there is still a leak. Then we can determine if it is the O2 sensor.

STFT is not calculated when the exhaust temperature does not reach the minimum threshold for the O2 sensor to operate, so if this injector leak occurs even with a cold exhaust, we can rule out the O2 sensor being the cause. And even if the O2 sensor is bad, your injectors should not be leaking anyway, so we still need to get to the root cause of the fuel leak.

Also check STFT and LTFT for O2 sensor diagnostics.

Actually I don't mean deposits in the injectors. But the sludge underneath it pushed the fuel back out of the engine block. He didn't take the engine apart. The kilometers traveled confirm this thesis, the engine must be disassembled and repaired, starting from the head. Something is wrong, especially if Xentry does not give errors, this is an internal mechanical defect and sludge can be when Xentry does not give errors. I am talking about the experience of owning a W176 (420,000) with the same problem. We were in complete despair, but after reworking the engine head, the problem was solved.

Sorry if this is an unnecessary question, but cylinder head repair is an expensive and time consuming task, so it is better not to rush to conclusions, and based on your experience, what helped you determine that the cylinder head was faulty? Describing this will help B0bby92 determine more quickly if his engine is failing.

 

[B0bby92]

I will replace the O2 sensor in a few days and report back. The engine runs fine when cold and starts shaking at idle when it warms up to 80-90 degrees Celsius.

 

[mattehardware]

I will replace the O2 sensor in a few days and report back. The engine runs fine when cold and starts shaking at idle when it warms up to 80-90 degrees Celsius.

This symptom supports my thesis. Of course, engine rework is expensive, and therefore it is never bad to try another option. We expect an update.

 

[B0bby92]

I replaced the O2 sensor today but nothing changed. Anyway, even after replacing it, the same error persists. I used a Bosch sensor. And I get this error Current and Stored on Xentry: "23E2-015 Check component G3/2 (Oxygen sensor upstream of catalytic converter)".