P126A – BMW

Code : P126A
Make : BMW
Description : P126A BMW Nitrogen Oxide Sensor Oxygen Sensor Before Catalytic Converter Plausibility Correlation Fault
Possible causes :
– Faulty Nitrogen Oxide (NOx) Sensor
– Nitrogen Oxide (NOx) Sensor harness is open or shorted
– Nitrogen Oxide (NOx) Sensor circuit poor electrical connection
Solutions :
– Carry out a Reset via CarDiag
– Choose a better quality fuel
– Check that the tank cap is securely closed
– Check the oil level and add more if it is lower than MAX
– Restart an Automatic diagnostic via CarDiag
– If the fault persists, you can check the “Possible causes” listed above : visually inspect (by yourself (tutorials to come) or by a professional) the wiring harness and the associated connectors, check for damaged components, and look for broken, bent, pushed, or corroded connector pins.

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