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Please i came here seeking guidance because my hands are tied and i do not know what else to do two months ago my mercedes started to act funny (stalling, hesitating, cold starting, at idle or low speeds engine shuts off by its own, at idle the rpm needle bounces up and down so as the car temperature gauge and even the ambient temperature sensor is acting funny from 29 degrees it suddenly jumps to 44 degrees. Even the AC and lights were acting funny fluctuating with the bounces of the rpm needle. So i went to the dealer and he said the car suffers from a series of problems and then he changed (the crankshaft sensor, uplink and downlink boost pressure sensors, the battery, the fuel pumps, the temperature gauge sensor , the ambient temperature sensor, fuel filter, air filter and he even did a oil change service) it costed me around 2000 dollars.
last week the same stuff started to happen once again and i am suspecting it’s an electrical short
somewhere causing the sensors to go bad.
so what i did is i bought a car diagnostic tool and scanned the vehicle myself and the attached photo showed up.
please could someone offer me guidance to what i should do?
I'd go back to that dealer and tell them that the problem they fixed is still there. You paid them to diagnose and fix a problem, and the same problem is still there.
It sounds like the dealer just shotgunned a bunch of parts at your car and charged you a lot of money without finding the true cause of the problems. It happens way too many times. Take it back with your report and see what they have to say. If they do additional work on the car, tell them not to replace any part without concrete solid demonstrable evidence that the part is truly bad. I think you have a circuit problems or problems. Once the circuit problems are identified and repaired, most/all of those DTC's will go away.
I'd go back to that dealer and tell them that the problem they fixed is still there. You paid them to diagnose and fix a problem, and the same problem is still there.
Has the car ever been in a wreck or flood?
No the car has never been in a flood nor a wreck and to be honest i am afraid that they will tell me it’s the car ecm.
It sounds like the dealer just shotgunned a bunch of parts at your car and charged you a lot of money without finding the true cause of the problems. It happens way too many times. Take it back with your report and see what they have to say. If they do additional work on the car, tell them not to replace any part without concrete solid demonstrable evidence that the part is truly bad. I think you have a circuit problems or problems. Once the circuit problems are identified and repaired, most/all of those DTC's will go away.
i dont know why dealers would do such a thing and it’s probably an electrical issue because there is no other explanation for it but i went throught the sensors wiring diagram they all seem to be attached directly to the car’s ecm i am afraid that it might be the ecm.
I think similar to what Sunnyslope posted about possible circuit failure.
Just an idea, a tedious approach would be to try to inspect wiring and connectors of all wiring harnesses that contain the affected circuits. This would include disconnecting, inspecting and reconnecting wiring connectors, including the ones at the end, but also any other connectors in the harnesses.
A frayed harness or corroded/damaged connector could cause these numerous faults. Maybe worth a try before replacing the ecm or SAM.
I think similar to what Sunnyslope posted about possible circuit failure.
Just an idea, a tedious approach would be to try to inspect wiring and connectors of all wiring harnesses that contain the affected circuits. This would include disconnecting, inspecting and reconnecting wiring connectors, including the ones at the end, but also any other connectors in the harnesses.
A frayed harness or corroded/damaged connector could cause these numerous faults. Maybe worth a try before replacing the ecm or SAM.
that is a very good advice sir I’ve went and downloaded the mercedes WIS and got the wiring diagram for those components and I’ll sure go inspect wiring and harnesses and connectors truly appreciated may god bless you.
It is my opinion that parts in general (ecm) should not be replaced until and unless there is absolute evidence that the part itself is 'bad'. Since virtually all engine related problems involve the ECM, just saying it 'could be' or it 'might be' or it 'probably is' the ECM is not sufficient. Dealerships and garages have oscilloscopes and scanners that few of us could afford that will help them identify the exact problem(s). They allow well trained techs to have the precise evidence that is required to determine what should be replaced and what is a false lead.
With as many parts having already been changed without any evidence of defect, it doesn't take much to see that the answer is almost certainly not changing more parts including the ECM. Conversely, why would all of those parts be changed if the ECM was the problem?? They can't have it both ways. And they shouldn't be guessing.
12-06-2018, 12:50 PM
