Help!! Engine management light

[GurjM]

Hi All,

New to forum and need help/advise!!

Have a c200k (2001) from new which has done 50k miles, but two weeks ago had the engine managment light come on, so booked it in to main dealer were the car has always been serviced and they said that the seal on the engine had leaked oil into the wiring harness connected to the engine and oil had travelled all the way into the control unit causing the sensor to short and warning light coming on!!

The repair was carried out at a cost of £1,300 which included a new cable harness, control unit and sender unit plus 8 hour of labour. Had the car back one day and the engine managment light has once again come on. On both occassions the car is running fine, other than being a bit heavy on the fuel.

What do I do, have I been ripped off by my dealer, help!! :???:

 

[television]

Hi All,

New to forum and need help/advise!!

Have a c200k (2001) from new which has done 50k miles, but two weeks ago had the engine managment light come on, so booked it in to main dealer were the car has always been serviced and they said that the seal on the engine had leaked oil into the wiring harness connected to the engine and oil had travelled all the way into the control unit causing the sensor to short and warning light coming on!!

The repair was carried out at a cost of £1,300 which included a new cable harness, control unit and sender unit plus 8 hour of labour. Had the car back one day and the engine managment light has once again come on. On both occassions the car is running fine, other than being a bit heavy on the fuel.

What do I do, have I been ripped off by my dealer, help!! :???:

Oil will not cause a short circuit, lets face it, its inside ignition coils, its even inside those huge transformers in power stations, OK they use wood oil. You would be hard pressed to short anything with 12 volts and oil.
you have been ripped off I think.

Malcolm

 

[racall]

I.ve heard that oil can leak out of the auto box and travel up the wires into a control box located in the passenger footwell causing problems.

 

[bundy]

as malcolm said this is a bull sh** excuse by the stealers to have your trousers down!! only yesterday i had a customer in my workshop with the same story as you! (it wasnt was it ) after reading the fault codes stored & clearing them i restarted it & it put the code back in AIR MASS SENSOR!!
I COULD NOT SEE A NEW LOOM OR ECU!!! supposidly the cam sensor had leaked & allowed oil into the loom,ecu... yeah i dont think so. take it back & kick off.
regards bundy

 

[GurjM]

Thanks for your help, I have booked it back into the dealer see what they have to say, I also tried to claim the cost of the repair via my insurance, but as expected they declined the claim, but they did say that the dealer had confirmed that the oil leak into the electrical connectors is a recurring problem with this type of Mercedes. So why don't Mercedes contribute the repair cost if this is a manufacturer's fault??

 

[piestore]

OIL in engine loom

HI Guys

Its not all bull **** it is a very common problem the adjuster actuator on the inlet cam leaks oil into the loom which then travels to all the sensors and the ECU all these sensors work on very sensative resistance readings introduction of oil to these sensors gives a false reading.

What is most common in these cases is that the car comes in with the engine light on, fault codes are checked and it faults the upstream O2 sensor this is replaced and the car is returned to the customer, a few days later the light is on again, return to dealer who the discovers oil problem, replaces loom, timing actuator and sometimes ECU and this should solve the problem, the trouble is the new O2 sensor has now been contaminated by the oil and must be replaced again.

This really is a very common fault and should be payed for by MB but I do know that most requests for this are refused in my opionion this is very wrong and should be challenged

 

[GurjM]

Hi Guys,

Just back from the dealer and they are adamant that the ECU had to be replaced because of the oil and have now identified the AIR MASS senor as the cause of the engine light remaining on which I argued they should have diagnosed on the first visit!!!

I will be writing to MB as I am disgusted at the built quality that I have experienced with this car and amount of problem I have had with it.

 

[television]

I still get very angry about this, I have printed circuit boards coming in that have had much worse than oil spilled on them. I can send boards away and have them washed for £15.00 with many more components than the ECU has.
they do not have to be taken out of the plastic box
I had my own ultrasonic tank until a couple of years ago,but for the few boards that I got it was not worth while.

This evening I poured oil on to a PCB, with 3kv on it and I could not pick up 1 microvolt leakage off the board

A sky box has 1000 x more components than an ECU and a 100 more micro's
running 100 x faster. In the morning I am going to set one up running and pour oil into it, I will use, used Magmatec oil that has been in the car for 6k
Will report back tomorrow

Malcolm.

 

[mercmonkey]

A sky box has 1000 x more components than an ECU and a 100 more micro's
running 100 x faster. In the morning I am going to set one up running and pour oil into it, I will use, used Magmatec oil that has been in the car for 6k
Will report back tomorrow

Malcolm.

Shed Science, gotta love it!

bet thats gonna smell good lol

I have to agree tho that I find it hard to beleive oil can damage a PCB, but then Im no electronics expert

 

[piestore]

oil in ecu

HI Guys

your missing The point it doesn't leak voltage it increases resistance which is the input for most of the engine sensors

 

[television]

HI Guys

your missing The point it doesn't leak voltage it increases resistance which is the input for most of the engine sensors

Sorry you have it the wrong way round, any increase in resistance is better, a decrease is worse.

Dosent leak voltage, well if something is going to leak, because of oil, what ?
I put oil over two tracks of a PCB with .5mm tracks, using an expensive 4½ dig meter and better than 20 meg ohm.
Basics= Ohms law = you cant have one without the other.

Malcolm

 

[JONSCLK]

being ripped off

Hi all i feel for you but could you let me know if you had any joy from MB because my CLK has the same diagnosis and is going to be £1000+ bill and ive been told its a manufacturing defect however MB wont admit it but theyve changed the wiring on the new models and i was wondering if its worth me picking a fight with a large manufacture or just flog it and stick with BMW`s

cheers

 

[ALAN@ECUCLINIC]

i wonder why they dont just immerse the ecu in oil ,then seal it!!! got to be a cure for all the water contamination i see in many ecu`s!!
later peugeot ecu`s are filled with rubber ,like a motorcycle cdi box it stops water getting in but doesnt stop them from using crappy components that fail more times than a ducati!!

 

[aazapf]

Which Dealer

Which Dealer did you take this too?

It sounds a bit dodgy..