Measures oxygen concentration in exhaust gases and sends voltage signals to the engine computer, which adjusts the air-fuel mixture for optimal combustion, fuel economy, and emissions performance.
$100 – $350 per sensor
Total Cost
60,000 – 100,000 miles
Replace Interval
Moderate
DIY Difficulty
Schedule Soon
If It Fails
Oxygen sensors measure the oxygen content in exhaust gases, telling the engine computer whether the air-fuel mixture is too rich (too much fuel) or too lean (too much air). Most cars have 2-4 oxygen sensors.
Parts Cost
$30 – $150 per sensor
Labor Cost
$50 – $150 per sensor
Replace when diagnosed as failed via check engine codes. Proactively replace at 100,000 miles as preventive maintenance.
Nissan oxygen sensors are a common failure point. Use Denso or NTK sensors for best results.
German car O2 sensors can be expensive — $80-$150 each. Bosch wideband sensors are the OEM supplier for most German vehicles.