Parts for your 2013 Ford Territory-Oxygen sensor

2013 Ford Territory oxygen sensor — what’s fitted and how to look after it

Based on technical references — Ford SZ Territory Workshop Manual (emissions and engine control sections), Bosch Australia and NGK/NTK sensor catalogues, plus Autodata/InfoTech emissions listings — the 2013 Ford Territory SZ with the 4.0‑litre petrol (Barra) engine is fitted with heated oxygen sensors (one before and one after the catalytic converter). Those same sources show the 2.7‑litre TDCi V6 diesel does not use a conventional oxygen (lambda) sensor in Australian/NZ spec, engine management instead leans on MAF/MAP/EGR data and exhaust temperature/differential‑pressure sensors for aftertreatment.

For owners of the petrol SZ, the oxygen sensor (often called HO2S) is a small but critical bit of kit. The front sensor lives in the exhaust manifold and constantly “tells” the ECU how much oxygen is in the exhaust so it can fine‑tune the air–fuel mix. The rear sensor sits after the cat and mainly monitors catalytic converter efficiency. Together they help keep fuel economy tidy, emissions clean, throttle response crisp, and the cat happy.

There’s no fixed replacement interval in the Ford service schedule, but these sensors are consumables. Over time (typically past 160,000 km, sooner if the engine has been running rich, burning oil, or exposed to silicone/oil contamination) response slows and accuracy drifts. That can show up as higher fuel use, a lazier feel on light throttle, a rougher idle, or a Check Engine Light with codes like P0130–P0167. A good technician will confirm with live data — looking at switching speed on the front sensor and cat‑monitor behaviour on the rear — before recommending replacement.

Smart servicing tips for the petrol Territory’s oxygen sensors:

• Fix vacuum leaks, misfires, and oil leaks early — they kill sensors and cats.
• Use quality fuel and the correct engine oil to minimise deposits and poisoning.
• If the exhaust has been off, make sure sensors are reinstalled with the correct anti‑seize (if specified) and torqued properly to avoid thread damage or leaks.
• When replacing, stick with OE‑equivalent sensors and keep wiring away from heat and sharp edges.

If the vehicle does lots of short trips, consider proactive testing or replacement around the 160–200,000 km mark to keep drivability and economy on point. For scan‑tool savvy workshops, a quick lambda response and fuel‑trim check at each major service is an easy health check.

For diesel SZ owners: a traditional oxygen sensor isn’t fitted because diesel combustion generally runs excess oxygen, making a narrowband petrol‑style lambda sensor less useful. The ECU manages fuelling from MAF/MAP/EGR feedback and monitors the exhaust with temperature probes and (where applicable) a DPF differential‑pressure sensor. Good diesel servicing focuses on clean air intake (MAF), tight boost plumbing, healthy EGR function, and accurate exhaust temperature/pressure sensing rather than O2 sensor maintenance.

Popular questions about 2013 Ford Territory oxygen sensors

How many oxygen sensors are on a 2013 Ford Territory?
The 4.0‑litre petrol model has two: one upstream (pre‑cat) and one downstream (post‑cat). The 2.7‑litre TDCi diesel doesn’t use a conventional oxygen sensor in local spec.

What are the signs an oxygen sensor is failing on the petrol Territory?
Higher fuel consumption, rough idle, hesitant light‑throttle response, and a Check Engine Light. Common fault codes sit in the P0130–P0167 range. A scan showing slow sensor switching or odd long‑term fuel trims is another giveaway.

When should the petrol Territory’s oxygen sensors be replaced?
No hard interval, but testing around 160,000 km is wise. Replace if response is slow, trims are out, or codes point to sensor performance. Always address underlying causes (misfires, leaks) to protect the new sensor.