Vehicle Questions and Answers
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How many oxygen sensors are there on a 2003 Toyota Corolla?
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On your 2003 Toyota Corolla, there are two oxygen sensors - one is located before the catalytic converter and the other is placed after it. To identify if a sensor is malfunctioning, watch out for these signs: the check engine light turns on, a decrease in fuel efficiency, seeing black exhaust smoke, and detecting a sulfuric odor from the exhaust. You can buy a suitable replacement sensor for around $67 at Autozone or similar auto parts stores. While replacing it yourself is not too complicated, if you opt for professional assistance, expect to spend about $80 to $100 for the service.
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