[bobss396]

For the shade tree mechanic, often the best option is to replace a suspect component if it is cheap enough. On a high-mileage car, things wear out or fail and the sensor is only the symptom of the real problem.

Unfortunately, many shops cater to the parts changing mantra and do a poor job of properly diagnosing the root cause of an error code.

Your best bet is to get an understanding of what the sensor does and follow it "upstream" to see what it senses.

Bob