Should I change O2 sensor?

The check engine light came on in my 99 Toyota Solara SLE and I plugged in the diagnostic tool and it says I have a bad O2 sensor. I am wondering if I should replace it because the car is running exactly as it was before as far as gas mileage and the exhaust isn't coming out black or anything. Is there a down side to just living with a bad O2 and could I cause problems for other parts of the car in the future?

Also, I had a trailer hitch wired the same day that the check engine light came on so is it possible that it could be a false warning caused by something electrical.

Thanks in advance for your insight.

First, just because the scanner says there is a problem with the O2 sensor CIRCUIT, it doesn't mean the sensor is 100%, guaranteed defective. Get the car to a qualified mechanic for a PROPER diagnosis.
Second, the trailer wiring is totally separate from the O2 sensor circuit. Its just a coincidence that the light came on.
Third, yes there is a downside to leaving the faulty O2 system. All the good running properties of the engine will begin to degrade. The gas mileage WILL suffer, the spark plugs will foul, the engine may begin to misfire, and then ruin the catalytic converter.

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About the Author

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