Can I drive with a bad O2 sensor?

Short term, yes, but you will waste fuel and a long-running rich mixture can damage your catalytic converter ($1,500+). Get the free OBD2 scan at AutoZone first to confirm which sensor (upstream vs downstream) is at fault.

How long do oxygen sensors last?

Modern heated O2 sensors typically last 60,000–100,000 miles. They wear gradually, so mileage and a confirming code are the best guide.

Oxygen (O2) Sensor

moderate DIY~1h job

What it does

Think of the oxygen sensor as your engine's taste-tester for exhaust. It sits in the exhaust pipe and sniffs how much unburned oxygen is leaving the engine, then tells the computer to add more or less fuel so the mix is just right. When it gets old and lazy, the computer guesses wrong, you burn extra gas, and the check engine light comes on.

Fix-vs-Skip Money Panel

DIY Cost

~$45

parts only

Shop Cost

~$200

parts + labor

Moderate DIY~1h job

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Frequently asked questions

check engine light — complete guide