Measures exhaust oxygen so the ECM can fine-tune fuel mix and protect the catalytic converter.
A zirconia or wideband cell generates voltage based on exhaust O2 content. Upstream sensor controls fueling, downstream sensor monitors cat efficiency.
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Replacement runs $250–$600 including parts and 0.5-1.5 hours labor. Exact cost depends on vehicle, parts tier (OEM vs aftermarket), and local labor rate.
Expected lifespan is 60,000-100,000 miles. Driving conditions, climate, and maintenance affect real-world life.
Check-engine light (P0130-P0167); Drop in fuel economy 15-40%; Failed emissions test; Rough idle; Sulfur smell.
Most modern oxygen (o2) sensors are sealed units that get replaced rather than rebuilt. A shop will diagnose, confirm with a load or output test, then swap the unit and verify operation.
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