Repair Cost Guide

Oxygen sensor replacement cost
for a Subaru Outback

Replacing a faulty oxygen (O2) sensor on a Subaru Outback involves locating the sensor, unplugging its electrical connector, and unscrewing it from the exhaust system. The primary cost drivers are the sensor's location (upstream or downstream) and whether it's an original equipment (OE) or aftermarket part. Labour costs vary significantly based on accessibility, as the upstream sensor near the engine can be more difficult to reach than the downstream one.

$220 – $450
Typical fair price range · USD

Cost breakdown

Parts: ~$60-$200 / Labour: ~$160-$250

What affects the price

Sensor location (upstream sensors are often more expensive and labour-intensive)
Part quality (OE vs. aftermarket or universal-fit sensors)
Model year and engine (some years require specific, pricier sensors)

Can you do it yourself?

Possible with skill — requires an O2 sensor socket, penetrating oil, and the ability to safely access the exhaust. The electrical connector can be tricky, and seized sensors are common.

Tips before you pay

Use a dedicated O2 sensor socket for clearance; a regular wrench often won't fit.
Apply penetrating oil to the sensor threads well in advance to ease removal of the often rusted-in part.
Always disconnect the battery before unplugging the sensor's electrical connector to avoid electrical issues.

Got an actual quote for this repair? Check if it's fair in seconds — or add it to your car's schedule so you never wonder when it's due again.

Check your quote free Track it in your Garage

More cost guides

Brake pads replacement — Subaru Outback Alternator replacement — Subaru Outback Timing belt replacement — Subaru Outback

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.