Mb c180 kompressor o2 sensor problem

[kaurisalkdasjds]

Hello i have mb c180 kompressor 120kw there is an errorcode on the o2 sensor heater circuit open (both) and intermittent signal shorted on the upper o2 sensor. there is oil in the o2 sensor plugs. with delphi ds 150e it shows constant. 0.6v on upper and. 0.4v on lower with little modulation. is it best to replace the o2 sensor and how to check if the sensor is fine?
the lower is with 4 wires and upper with 6.
Thanks.

 

[SW Solution]

Hello, the oil comes into the engine wiring harness via the camshaft adjuster. The following should be checked: electrical connector camshaft adjuster, engine control unit connectors, you have already checked the O2 lambda sensor. There are also intermediate adapters for the camshaft adjusters so this shouldn't happen anymore. I can send you the parts list tomorrow. For questions, just let me know. All the best Kind regards, Christoph

 

[kaurisalkdasjds]

the ecu connection is dry, the camshaft sensor plugs seem damp from oil. Someone mentioned about those adapter cables, but told me that factory recommends replacing whole harness. i cleaned the o2 sensor plugs from oil but didn't measure anything, should i take them out, measure them and heat them up to clean them?

 

[SW Solution]

Yes, it is true that it is recommended to replace the wiring harness, but I have had a few vehicles that had to be cleaned several times and then it worked again, a little more complicated but cheaper. However, I had to replace the O2 sensors on some vehicles. Try to get the oil out of the lines as best as possible with brake cleaner. Picture of the camshaft adjusters in the appendix. These become leaky internally and so the oil is distributed throughout the line set. the adjusters also need to be replaced.

 

[SW Solution]

solenoid camshaft adjuster A2710510177
Sealing ring camshafts adjusted A0109972348
Cap A2710510032
and the adapter plug A2711502733

 

[kaurisalkdasjds]

so i will order the parts and start cleaning the o2 and cam sensor plugs regularly and it should fix its self after about a month and then if not then need to buy the o2 sensors.

 

[kaurisalkdasjds]

Took the lamdas off the car, heated them red hot and put them back, front lambda wire was between gearbox and engine causing the intermittent shorts, previous owner who i know did it. Should the exaust cam sensor be replaced or better both? The only permanent error is secondary o2 heater whick stayed

 

[SW Solution]

As already written above, the oil comes through the magnet of the camshaft adjustment, which needs to be replaced because it is leaking internally. The lambda sensor is probably also defective and needs to be replaced.

 

[andresz28]

replace the magnets and o2 sensors

 

[berkesmob]

I had the same issue you need to replace oxygen sensors and clean the plugs of all wirings then change the magnets, also add a extra extension cable to prevent the oil ever reaching the wirings again with this mercedes notice stating to add this part code 2711502733. around every 80 thousand you should change these magnets, magnets also contribute to chain issues so its always better to change them