NOx Sensor B U029 communication issue
Thread Starter
Newbie
Joined: May 2021
Posts: 3
Likes: 0
GLK250
NOx Sensor B U029 communication issue
Hello, New to MB forum. Not new. to MB
I have GLK 250 I have a NOx B code come on.Replaced the sensor and could not clear the code.Took it to the dealer to have it programmed (mySnap-on software is to old and 21.4 Snap-on software won't communicate with the engine).They couldn't communicate with it either. Told me it was because of an exhaust leak. Fixed that leak, I can turn check engine light off but the U029 communications error is still held in the ECM. I check wires ground fuses. Took it to a mechanic friend he double check ever thing I had checked says everything looked good. I am nervous to take it back to the dealer for them to say that can't communicate with it again and open another $300 for them to plug it in sorry..... Anybody have any information on what my communications error is caused by? Any TSB? I am really grasping for information on this Benz wiring diagrams something. Thanks for any help
I have GLK 250 I have a NOx B code come on.Replaced the sensor and could not clear the code.Took it to the dealer to have it programmed (mySnap-on software is to old and 21.4 Snap-on software won't communicate with the engine).They couldn't communicate with it either. Told me it was because of an exhaust leak. Fixed that leak, I can turn check engine light off but the U029 communications error is still held in the ECM. I check wires ground fuses. Took it to a mechanic friend he double check ever thing I had checked says everything looked good. I am nervous to take it back to the dealer for them to say that can't communicate with it again and open another $300 for them to plug it in sorry..... Anybody have any information on what my communications error is caused by? Any TSB? I am really grasping for information on this Benz wiring diagrams something. Thanks for any help
Last edited by Chesterfield68; May 30, 2021 at 01:28 PM.
Thread Starter
Newbie
Joined: May 2021
Posts: 3
Likes: 0
GLK250
Hello, New to MB forum. Not new. to MB
I have GLK 250 I have a NOx B code come on.Replaced the sensor and could not clear the code.Took it to the dealer to have it programmed (mySnap-on software is to old and 21.4 Snap-on software won't communicate with the engine).They couldn't communicate with it either. Told me it was because of an exhaust leak. Fixed that leak, I can turn check engine light off but the U029 communications error is still held in the ECM. I check wires ground fuses. Took it to a mechanic friend he double check ever thing I had checked says everything looked good. I am nervous to take it back to the dealer for them to say that can't communicate with it again and open another $300 for them to plug it in sorry..... Anybody have any information on what my communications error is caused by? Any TSB? I am really grasping for information on this Benz wiring diagrams something. Thanks for any help
I have GLK 250 I have a NOx B code come on.Replaced the sensor and could not clear the code.Took it to the dealer to have it programmed (mySnap-on software is to old and 21.4 Snap-on software won't communicate with the engine).They couldn't communicate with it either. Told me it was because of an exhaust leak. Fixed that leak, I can turn check engine light off but the U029 communications error is still held in the ECM. I check wires ground fuses. Took it to a mechanic friend he double check ever thing I had checked says everything looked good. I am nervous to take it back to the dealer for them to say that can't communicate with it again and open another $300 for them to plug it in sorry..... Anybody have any information on what my communications error is caused by? Any TSB? I am really grasping for information on this Benz wiring diagrams something. Thanks for any help
