Parts for your 2013 Subaru Xv-Oxygen sensor

2013 Subaru XV oxygen sensor: what it does and when to replace it

According to Subaru technical sources — the XV (GP, 2013) factory service manual for the FB20 engine and the Subaru genuine parts catalogue — this model runs two lambda devices: a front air–fuel ratio (A/F) sensor in the exhaust manifold and a rear oxygen sensor after the catalytic converter. That’s consistent with ADR/Euro emissions requirements, so an oxygen sensor is absolutely used and relevant on the 2013 Subaru XV.

On this XV, the front A/F sensor constantly measures exhaust oxygen so the ECU can keep the mixture right on the money for smooth running, good fuel economy and low emissions. The rear oxygen sensor sits behind the cat and keeps an eye on catalytic converter efficiency. Together they help the engine adapt to conditions — hot day in Brisbane or cold morning in Dunedin — while protecting the cat from rich running.

There’s no fixed replacement interval in Subaru schedules, but many owners see sensor wear around 150–200,000 km or after 8–10 years. If the XV’s using more fuel than usual, idling a bit rough, lacking pep, or showing a Check Engine Light with codes like P0131/P0134 (front) or P0137/P0140/P0420 (rear/cat efficiency), the oxygen sensor system deserves a look.

Good servicing habits help the sensors live longer:

• Fix exhaust leaks and vacuum leaks promptly — false air upsets sensor readings.
• Use quality fuel and keep the air filter fresh to avoid sooty build-up.
• Avoid silicone sprays near the intake, vapours can foul sensor elements.

When replacement’s due, go for OEM or a trusted equivalent (the XV’s front unit is a wideband A/F sensor, the rear is a conventional O2 sensor). A technician will confirm with scan data — short/long-term fuel trims and sensor switching behaviour — and check the heater circuits. If DIY-ing, use an O2-sensor socket, route the loom exactly as factory to avoid heat, and tighten to the spec in the service manual. A tiny dab of sensor-safe anti-seize on the threads is fine if it’s not pre-coated, but never contaminate the tip.

Driving with a lazy sensor won’t usually strand anyone, but it can chew through fuel, risk cat damage, and cause WOF/rego emissions headaches. Sorting the oxygen sensor on a 2013 Subaru XV keeps it running sweet, clean and efficient for the long haul.

Popular questions

How many oxygen sensors does a 2013 Subaru XV have and where are they?
The XV (FB20) has two: a front air–fuel ratio sensor threaded into the exhaust manifold (Bank 1 Sensor 1) and a rear oxygen sensor mounted after the catalytic converter (Bank 1 Sensor 2). The front handles precise mixture control, the rear monitors the cat.

What are the signs the oxygen sensor needs replacing?
Common clues include poorer fuel economy, rough idle, hesitation, a Check Engine Light, or emissions test issues. Fault codes such as P0131/P0134 (front) or P0137/P0140/P0420 (rear/catalyst efficiency) often point to sensor or related issues.

Is it okay to keep driving with a bad oxygen sensor?
Short trips are usually fine, but it’s not ideal. The engine may run rich, risking catalytic converter damage and higher fuel costs. It’s best to diagnose and replace the faulty sensor sooner rather than later.