Repair Cost Guide

Oxygen sensor replacement cost
for a Nissan Altima

Replacing a failed oxygen (O2) sensor on a Nissan Altima involves locating the faulty sensor, disconnecting its electrical plug, and unscrewing it from the exhaust pipe. The cost is primarily driven by the price of the sensor itself and whether it's the upstream (more expensive, pre-catalytic converter) or downstream unit, with labour varying based on the sensor's accessibility in the engine bay.

$180 – $400
Typical fair price range · USD

Cost breakdown

Parts: ~$50-$150 / Labour: ~$130-$250

What affects the price

Sensor location (upstream vs. downstream, accessibility)
Sensor brand (OE Nissan vs. aftermarket)
Vehicle generation and engine size (e.g., 2.5L vs. 3.5L V6)

Can you do it yourself?

Possible with skill — requires an O2 sensor socket, ratchet, and the ability to safely access the exhaust. The main challenge is often loosening a sensor that is rusted or seized in place.

Tips before you pay

Use an O2 sensor-specific socket for clearance and to avoid damaging the sensor wiring.
Apply penetrating oil to the sensor threads well in advance if they appear rusty.
Always disconnect the battery before starting to prevent electrical issues when unplugging the sensor.

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More cost guides

Brake pads replacement — Nissan Altima Alternator replacement — Nissan Altima Timing belt replacement — Nissan Altima

Estimate based on typical U.S. market rates as of July 2026. Actual prices vary by region, shop, and parts quality — always compare against a real quote using our Scam Checker.