The Oxygen Sensor Replacing of Your Car

A common problem that trips the Check Engine light on your dashboard is a faulty oxygen sensor. This is one of the many times you’ll need an OBD II scan tool, at least if your car is a 1996 or newer model year. If the scan tool points to an O2 sensor, be aware that vehicles can have as many as four O2 sensors in the exhaust system—one or two before the catalytic convector and one or two after. They look like spark plugs, and your diagnostic tool might be able to tell you which one needs replacing. (If not, you’ll need someone with a higher-tech scanner to identify it.)
The O2 sensor can be removed with an open-end wrench, but you should buy a socket specifically designed for the sensors from your parts dealer because it will have a groove for that outgoing wire. Spray some penetrating oil on the base of the sensor before attempting to turn it with a wrench; it’ll make the job easier.

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