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alijanjan

E90 oxygen sensor issues

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Hi all

I used to get 2CA2 AND 2CA3 codes on my N46B20 e90 so I changed both pre cat oxygen sensors (it was a lot easier than I expected). 

Now with the new sensors I don't get those codes any more but I get couple of new codes. I'm getting 2C45 and 2C46. Also sometimes getting 2D11 and 2D12. Never used to get these codes before replacing the sensors 

While I was replacing the pre cat sensors, I unplugged the post cat ones and gave the plugs a clean with contact cleaner 
The new sensors were Bosch ones
Anyone had similar issues? Any help is appropriated

Thanks 

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99.9% of the time 02 sensor fault codes are triggered by over fueling or running lean and not a sensor fault. They are the result... not the cause. The most common causes on your engine type is unmetered air (air leaks) in the manifold or crankcase breather system. Correct diagnosis is the key to repairing these faults. Using the wrong type of scanner can lead you down the wrong and expensive repair road.

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On 12/24/2018 at 4:18 AM, B.M.W Ltd said:

99.9% of the time 02 sensor fault codes are triggered by over fueling or running lean and not a sensor fault. They are the result... not the cause. The most common causes on your engine type is unmetered air (air leaks) in the manifold or crankcase breather system. Correct diagnosis is the key to repairing these faults. Using the wrong type of scanner can lead you down the wrong and expensive repair road.

Thanks for the reply Glenn

I've looked and cannot find any obvious leak, unless it's the CCV. I've checked the CCV hoses and all seem intact ( as far as I can see without removing the intake manifold). Should I be looking at replacing the CCV kit? The car has done 150k

The engine runs very smooth however, cold and warm

 

Edited by alijanjan

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So the oxygen sensor codes have all magically disappeared 

I'm thinking maybe to do with the adaptation as I couldn't reset them after installing the new sensors 

I have driven the car around 2k since the last reset and they have not come back yet

 

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