O2 Sensor
Shop Cost
$280
DIY Parts
$60
You Save
$220
Tools Required (4)
O2 sensor socket (22mm slotted)
Ratchet & extension
Penetrating oil
Jack & jack stands
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.