What's involved
What this repair actually is.
Oxygen sensors measure how rich or lean your exhaust is so the engine computer can constantly fine-tune the fuel mix. When one fails or gets lazy with age, fuel economy drops, the engine can run rough, and the check engine light comes on; we confirm which sensor failed, remove it, and install a new OE-quality sensor.
Symptoms
How you can tell.
- Check engine light with an O2 sensor code
- Noticeably worse gas mileage
- Rough idle or hesitation
- Rotten egg smell from the exhaust
- Failed emissions inspection
If you delay
A bad O2 sensor wastes fuel every mile and running rich long enough can overheat and ruin the catalytic converter.
Educational estimate. Real pricing depends on your vehicle, the inspection, parts availability, taxes, and shop rates. Use this as a guide while you shop quotes.