O2 Sensor

Easy
30-60 min▶ Watch Videos
Shop Cost
$280
DIY Parts
$60
You Save
$220

Tools Required (4)

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Parts & Consumables

O2 sensorAnti-seize
Pro Tip Easier warm. Use slotted socket to protect wire.

🚗 Vehicle-Specific Notes

Honda
Primary (upstream) is easy — top of exhaust manifold. 22mm O2 socket.
Toyota
Upstream above cat, downstream below. 22mm. Apply anti-seize to new sensor threads.
Ford
Ecoboost: upstream sensors tight. Downstream easier from under car.
Subaru
Front O2 sensor accessible from top on boxer. Rear is under car behind cat.
BMW
Pre-cat and post-cat sensors. Use BMW-specific connectors. Scan tool to verify which bank.

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