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Hi, so BMW wants $1300 to replace or diagnose the OBD CO2 Sensor replacement. However, my mechanic (cheap) replaces it now twice now with a BMW sensor. The check engine light is still coming on and reading CO2 Sensor. WHY????
 

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Do you have a N52 or N51 motor?
How many miles on the car?
In order to make sense out of errors codes you should have
a Scanner or BMW software capable of reading all BMW codes.
CID Codes might tell you something.
Also are you sure you didn't mean Oxygen Sensor?
 

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Hi, so BMW wants $1300 to replace or diagnose the OBD CO2 Sensor replacement. However, my mechanic (cheap) replaces it now twice now with a BMW sensor. The check engine light is still coming on and reading CO2 Sensor. WHY????
You have FOUR (4) Oxygen Sensors (O2 Sensors), and NO CO2 sensor. :) There are MANY different O2 Sensor codes that are possible, and MOST of them don't mean you need to change the sensor, so you/your mechanic need to understand what the code is and what it means (what conditions cause that code to be saved in DME memory), and/or how to test the wiring or system. It could be something as simple as a blown O2 Sensor HEATER fuse. Have you had the breather heater recall performed by the dealer yet? That is on the same fuse circuit as the four O2 Sensor heaters.

Before ANYONE here can answer your question, or diagnose your issue, we need to know:
1) ALL codes that have been read in the DME (Engine Control Module) since the SES light first appeared, and particularly what code(s) are NOW present?
2) What your mechanic replaced or changed in any way (what is stated on invoice)?
3) Any performance issues your car has, such as rough idle, hard starting, etc.?
4) Whether or not YOU have, or have access to, a code reader or scan tool? For O2 sensor codes, a cheap P-code reader is fine, and that is also true for MOST engine DME faults.

With that information, someone can help you determine what to do next.

George
 
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