2006 C280 W203 Trouble with O2 sensors need help
Thread Starter
Newbie
Joined: Jul 2017
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Mercedes Benz C Class C280
2006 C280 W203 Trouble with O2 sensors need help
Hello all
I have trouble code issues and no one in my area can tell me what the problem is not even the dealer.
Original Problem:
O2 sensor Bank 1 Sensor 1 Open Circuit P2237
O2 sensor Bank 2 Sensor 1 Open Circuit P2240
HO2S Heater Control Circuit Low Bank 1 Sensor 1 P0031
HO2S Heater Control Circuit Low Bank 2 Sensor 1 P0051
Throttle Valve Actuator Jamming or Iced Up P0638
I had both O2 sensors replaced with parts that I bought OEM Bosch Upstream Left and Right O2 Sensors
I had two Throttle Valve Actuators Changed by a mechanic shop I don't know part numbers for those or kind
I also had all the coils and plugs changed with Bosch products
After those things were changed I took it home and it has been running rough I brought it to another shop with them saying that they specialize in European cars and electrical problems and they are a transmission shop as well Turns out I needed a transmission so I had it replaced while they were doing a diagnostic for why it was still acting up.
I got the car back and after the transmission was replaced it is now running like a brand new car no problems However I am still getting the above codes even after the computer was reset and all the DTC codes were erased the come right back and its the same ones!
Took it to the dealer and they said that the computer is fine and they want to replace the same parts I had just put in by another shop but they want to charge me 5900.00 !!!
A little help please is it my computer? but the car is running like a champ no problems. I can't find anyone here who knows how to work on these cars in Orlando FL
banging head against wall is not helping me.
thanks in advance
I have trouble code issues and no one in my area can tell me what the problem is not even the dealer.
Original Problem:
O2 sensor Bank 1 Sensor 1 Open Circuit P2237
O2 sensor Bank 2 Sensor 1 Open Circuit P2240
HO2S Heater Control Circuit Low Bank 1 Sensor 1 P0031
HO2S Heater Control Circuit Low Bank 2 Sensor 1 P0051
Throttle Valve Actuator Jamming or Iced Up P0638
I had both O2 sensors replaced with parts that I bought OEM Bosch Upstream Left and Right O2 Sensors
I had two Throttle Valve Actuators Changed by a mechanic shop I don't know part numbers for those or kind
I also had all the coils and plugs changed with Bosch products
After those things were changed I took it home and it has been running rough I brought it to another shop with them saying that they specialize in European cars and electrical problems and they are a transmission shop as well Turns out I needed a transmission so I had it replaced while they were doing a diagnostic for why it was still acting up.
I got the car back and after the transmission was replaced it is now running like a brand new car no problems However I am still getting the above codes even after the computer was reset and all the DTC codes were erased the come right back and its the same ones!
Took it to the dealer and they said that the computer is fine and they want to replace the same parts I had just put in by another shop but they want to charge me 5900.00 !!!
A little help please is it my computer? but the car is running like a champ no problems. I can't find anyone here who knows how to work on these cars in Orlando FL
banging head against wall is not helping me.
thanks in advance
Thread Starter
Newbie
Joined: Jul 2017
Posts: 11
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Mercedes Benz C Class C280
No the dealer did nothing except possibly test to see if the computer was good, which is what I asked of them but they did not charge me for that service because I was there for other stuff so who knows they have been wrong before and want me to spend 5900.00 with them for the repairs
MBWorld Fanatic!
Joined: Jun 2011
Posts: 1,494
Likes: 131
From: Cape town
not a merc
There is no way a dealer can test if the ecu is faulty other fitting a new one. Tell them u want the flashware version checked and updated if need be. I have had these faults before esp throttle body icing and it ended up being the ecu. In my case a flash update never helped.
Thread Starter
Newbie
Joined: Jul 2017
Posts: 11
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Mercedes Benz C Class C280
There is no way a dealer can test if the ecu is faulty other fitting a new one. Tell them u want the flashware version checked and updated if need be. I have had these faults before esp throttle body icing and it ended up being the ecu. In my case a flash update never helped.
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Thread Starter
Newbie
Joined: Jul 2017
Posts: 11
Likes: 0
Mercedes Benz C Class C280
so its not dealer only and the dealer wants $2800.00
I just want to make sure its my ecm or not my ecm I dont want to throw money at a ecm for it not to be that
I dont need to know that the dealer has my parts I already know that
I need to know what fixes people have done with the same or similar problems or what to look for
MBWorld Fanatic!
Joined: Jun 2011
Posts: 1,494
Likes: 131
From: Cape town
not a merc
I said NEW is dealer only sure you can get it cloned from a used one.
The thing is testing costs money and if you have done all the testing needed the only true way to confirm its the ecu is to fit a test unit! Unless you know a company near you that can test the ecu but even that is no sure way of knowing its good or bad. If it fails on a bench test well then it's your lucky day. But it can also pass all the bench tests and still fail on the car. That is why I have test units. It's a fast and easy way to condem or rule out the ecu. A dealer will never do that, they will just charge for a new one and once it's fitted its assigned to your car and not returnable. It's a difficult one for you. I can only tell you I have had the same faults 're throttle body icing and o2 sensor issues and it was the ecu.
The thing is testing costs money and if you have done all the testing needed the only true way to confirm its the ecu is to fit a test unit! Unless you know a company near you that can test the ecu but even that is no sure way of knowing its good or bad. If it fails on a bench test well then it's your lucky day. But it can also pass all the bench tests and still fail on the car. That is why I have test units. It's a fast and easy way to condem or rule out the ecu. A dealer will never do that, they will just charge for a new one and once it's fitted its assigned to your car and not returnable. It's a difficult one for you. I can only tell you I have had the same faults 're throttle body icing and o2 sensor issues and it was the ecu.
Thread Starter
Newbie
Joined: Jul 2017
Posts: 11
Likes: 0
Mercedes Benz C Class C280
I said NEW is dealer only sure you can get it cloned from a used one.
The thing is testing costs money and if you have done all the testing needed the only true way to confirm its the ecu is to fit a test unit! Unless you know a company near you that can test the ecu but even that is no sure way of knowing its good or bad. If it fails on a bench test well then it's your lucky day. But it can also pass all the bench tests and still fail on the car. That is why I have test units. It's a fast and easy way to condem or rule out the ecu. A dealer will never do that, they will just charge for a new one and once it's fitted its assigned to your car and not returnable. It's a difficult one for you. I can only tell you I have had the same faults 're throttle body icing and o2 sensor issues and it was the ecu.
The thing is testing costs money and if you have done all the testing needed the only true way to confirm its the ecu is to fit a test unit! Unless you know a company near you that can test the ecu but even that is no sure way of knowing its good or bad. If it fails on a bench test well then it's your lucky day. But it can also pass all the bench tests and still fail on the car. That is why I have test units. It's a fast and easy way to condem or rule out the ecu. A dealer will never do that, they will just charge for a new one and once it's fitted its assigned to your car and not returnable. It's a difficult one for you. I can only tell you I have had the same faults 're throttle body icing and o2 sensor issues and it was the ecu.
everyone I called said it was the computer so I am going to throw parts at it now I hope I don't have a short in the harness that when I get it back it will short the ecu out. crossing fingers
he said if I sent it today for him to get it by 10:30am tomorrow he will send it back the same day and invoice me when its ready to be shipped back overnight. I should have it by Friday I will let you know then how it went!
Last edited by jimmysixe; Aug 15, 2017 at 04:13 PM. Reason: adding things
