Oxygen sensors tell the computer how to mix fuel. When one gets lazy or its heater fails you get a check engine light, worse mileage, and eventually a failed emissions test. We confirm the sensor is actually the problem — not an exhaust leak or vacuum leak — and replace it with an OEM-quality sensor.
Signs you need oxygen sensor replacement
- Check engine light with an O2 or heater circuit code
- Poor fuel economy
- Rotten-egg smell from the exhaust
- Failed emissions test
- Rough idle
What we do on site
- Read the code and live sensor data
- Check for exhaust leaks upstream of the sensor
- Remove the old sensor (heat and penetrant if seized)
- Install the new sensor with anti-seize, torque to spec
- Clear codes and verify the sensor is switching
Doing this in a driveway
Mobile on nearly every vehicle. Seized sensors occasionally need extra time.
Parts we use
Upstream or downstream oxygen sensor, or wideband air-fuel sensor.
Pricing: Low to moderate; upstream wideband sensors cost more than downstream ones. Every job is quoted in writing before we start, and there's no upsell — how our pricing works.
FAQ
Oxygen Sensor Replacement: common questions
Does P0420 mean I need a catalytic converter?
Not necessarily. P0420 is catalyst efficiency, and a lazy downstream sensor, an exhaust leak, or a misfire can cause it. We test before we condemn a converter.