JC180
Active Member
- Joined
- Jan 9, 2007
- Messages
- 289
- Location
- Manchester
- Car
- 2010 Mecedes Benz C250 CGI Sport Auto Estate
Hi All
This light first came on in April. There were no real symptoms just a little lazier throttle response (presumably limp home?) while the light was on. I has this reset and all was OK for 3 further months. It came on again in June and the local indie said it was the AMS. I booked it in for this to be done and the air filter was changed at the same time. I suspected that the AMS had not been replaced, rather just the air filter and the light reset but they did produce the 'old' one after the weekend so short of stripping the air box I had no proof.
This morning the light came back on with the same fault codes. 'incorrect mixture at part throttle mixture too rich etc...' fuel consumption has dropped from 23/24mpg around town to 17/18 which would back this fault up. I made the point that maybe the AMS was faulty (hoping they would actually replace it this time) but he said that it was unlikely to be the AMS as I would be losing power. He said he had asked Mercedes for some direction as he has had a load of problems with engine management lights on C Class's and thinks it could be to do with oil leaking in to the lambda sensor through cabling, (even though the ones he's checked have been clean!) He said I should give it a week to 10 days.
Now, does their reasoning follow? I have the 271 engine I beleive but have not heard of the oil/ecu lambds sensor problem with this model.
Any help/ideas welcome.
Obviously I would rather they replaced the Air Mass Sensor again.
Cheers
Jacob
This light first came on in April. There were no real symptoms just a little lazier throttle response (presumably limp home?) while the light was on. I has this reset and all was OK for 3 further months. It came on again in June and the local indie said it was the AMS. I booked it in for this to be done and the air filter was changed at the same time. I suspected that the AMS had not been replaced, rather just the air filter and the light reset but they did produce the 'old' one after the weekend so short of stripping the air box I had no proof.
This morning the light came back on with the same fault codes. 'incorrect mixture at part throttle mixture too rich etc...' fuel consumption has dropped from 23/24mpg around town to 17/18 which would back this fault up. I made the point that maybe the AMS was faulty (hoping they would actually replace it this time) but he said that it was unlikely to be the AMS as I would be losing power. He said he had asked Mercedes for some direction as he has had a load of problems with engine management lights on C Class's and thinks it could be to do with oil leaking in to the lambda sensor through cabling, (even though the ones he's checked have been clean!) He said I should give it a week to 10 days.
Now, does their reasoning follow? I have the 271 engine I beleive but have not heard of the oil/ecu lambds sensor problem with this model.
Any help/ideas welcome.
Obviously I would rather they replaced the Air Mass Sensor again.
Cheers
Jacob
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