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Check the condition of your timing belt by removing the top dust or safety cover of your vehicle. You may need to unscrew a few bolts to gain access to the timing belt. Ensure that your engine is not running when performing this condition check.

Use a flashlight to inspect your timing belt for cracks, especially at the drive teeth base. Make sure you check it thoroughly for signs of wear and replace it as soon as possible.

Read your car repair manual thoroughly to understand and learn how to remove and replace the timing belt. If you are not confident replacing the timing belt yourself, take it to your auto mechanic shop without delay for immediate replacement.

Remove all obstructions from engine front and remove upper and lower timing belt covers to gain access. Then loosen or remove timing belt tensioner to release the timing belt.

Remove timing belt and clean all debris from area and utilize a timing belt diagram to time the connection between the crankshaft and the camshaft.

Replace timing belt with tensioner, as necessary. Re-install or re-assemble timing belt only if you determine that it is still in good working condition and replacement is not necessary.

Locate the oxygen sensor in the exhaust manifold or the exhaust pipe next to the catalytic converter. It resembles a spark plug and has one thin wire extending from it. Use the replacement sensor for a visual aid.

Push in on the lock on the wire harness at the top of the sensor. Pull the wire off.

Remove the sensor with a deep well socket or wrench. Due to the extreme heat generated in the manifold and exhaust pipe, it is common for the sensor to become stuck. If necessary, use spray-on rust breaker such as liquid wrench to aid in the removal process.

Place a small amount of anti-seize compound on the threads of the new oxygen sensor and thread the sensor back into the manifold or tail pipe.

Push the connector of the wire back onto the oxygen sensor.