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Can transmission fluid wreck o2 sensor? 200

posted by  someone claiming to be Rhys on  Sun Feb 23 06:55 CST 2003 [RELATED]

If the seal leak on the transmission caused oil to the thrown onto the outside of the O2 sensor, then yes, it could cause the code to be tripped. The O2 sensor body allows outside reference air to enter it to be used as a comparison to the exhaust gas. If the outer shell of the O2 gets oil, or mud, or any other contaminent on it, it will prevent the reference air from entering. This will put the sensor out of range and cause the fault. I am not aware of any method of cleaning the sensor that wouldn't also damage it further, so you may have to replace it.
People that drive modern four wheel drive vehicle off road a lot encounter this same problem with mud splashed on the O2 sensor.






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