Oxygen (O2) Sensor Guide & Diagnostic Information
The oxygen sensor measures the proportion of oxygen in the gas analyzing device to check if fuel control is operating efficiently.
Location on Vehicle
Screwed into the exhaust pipe, before (Sensor 1) and after (Sensor 2) the catalytic converter.
Typical Symptoms of Failure
- Engine hesitation
- Poor fuel economy
- Failed emissions test
Associated Diagnostic Trouble Codes
A malfunction in the Oxygen (O2) Sensor can trigger the following OBD-II fault codes:
Estimated Replacement Cost
Typical cost to replace the Oxygen (O2) Sensor: $150 - $350 (parts and labor).
Citations & Authority References
This technical part definition is cross-referenced with:
- EPA On-Board Diagnostics II Standard Specifications
- SAE J2012 Automotive Component Design Regulations