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Frequent Asked Questions

1. How do I know when to change my oxygen sensor?
  • Answer
    • a) You could have a bad smell coming for your exhaust pipe.
    • b) You may have a check engine soon light that lights up on your dashboard.
    • c) You may be getting poor gas mileage and / or performance.
    • d) If you have over 50,000 miles on your car or truck.

2. Where is the oxygen sensor(s) located?
  • Answer:
    • a) They are on the exhaust manifold and or exhaust pipes before (Pre - CAT) and after (Post - CAT) the catalytic converter. For more information on Pre-Cat and Post-Cat locations - Click here.
    • b) You many have from 1 to 4 of them in your exhaust system.

3. What is an Oxygen or O2 sensor and how does it work?
  • Answer:
    • a) If you own a car that was built after 1980, you will have one or more oxygen sensors on your vehicle.
    • b) The oxygen sensor measures the exhaust to find out if it is running too rich or too lean and tells your cars  computer system, so it can make adjustments to you fuel system.