Parts for your 2016 Ford Territory-Oxygen sensor

2016 Ford Territory Oxygen Sensor: What’s Fitted and How to Look After It

Technical references indicate the 2016 Ford Territory does use oxygen sensors on the petrol models, but not on the diesel. Ford’s SZ MkII Workshop Manual for the Barra 4.0 petrol lists heated oxygen sensors (HO2S) before and after the catalytic converter in the engine control strategy. Parts catalogues such as Ford Microcat/EPC and Bosch Australia’s Oxygen Sensor Application Guide also list HO2S part numbers for Territory 4.0L petrol (2011–2016). By contrast, the Ford 2.7 TDCi diesel service literature describes exhaust gas temperature (EGT) sensors and a diesel particulate filter (DPF) differential pressure sensor, with no HO2S specified. Industry data sources like Autodata/NAPA similarly show O2 sensors on petrol variants and none on the 2.7 diesel.

For owners of the petrol SZ MkII, the oxygen sensor (often called a lambda sensor) is a small but hard-working bit of kit that keeps the Territory running sweet as. Mounted in the exhaust, it measures oxygen in the spent gases so the engine computer can fine-tune fuel delivery. That helps fuel economy, smooths out drivability, and protects the catalytic converter from damage caused by running too rich. The petrol Territory typically has two sensors: one upstream to manage fuelling, and one downstream to keep tabs on catalyst performance.

Like spark plugs and filters, O2 sensors age. Contamination from silicone sealants, coolant, or oil burning can slow their response. Drivers might notice a jump in fuel use, a check-engine light, rough idle, or a stubborn emissions test. While some last well past 160,000 km, many technicians suggest checking live data and readiness monitors at major services from around 120,000–150,000 km, especially if economy drops or codes crop up.

• Typical symptoms: increased fuel consumption, hesitation, rough idle, or stored codes (e.g., P0130–P0160 range).
• Service tips: use the correct upstream/downstream part numbers, avoid touching the sensing tip, and only apply sensor-safe anti-seize on threads if specified by the maker.
• After fitting: clear fault codes, verify no exhaust leaks, and confirm closed-loop operation and trims on a scan tool.

For the 2.7 TDCi diesel Territory, an oxygen sensor isn’t used. The diesel’s air–fuel control relies on mass air flow, boost, EGR and injection timing, while emissions aftertreatment is monitored by EGT and DPF pressure sensors. That’s why “oxygen sensor” listings don’t apply to the diesel variant.

Popular questions

How many oxygen sensors does a 2016 Ford Territory have?
On the petrol Barra 4.0, there are usually two: one before the catalytic converter (upstream) and one after it (downstream). The 2.7 TDCi diesel doesn’t use oxygen sensors.

When should the oxygen sensor be replaced?
There’s no fixed interval, but many are checked from around 120,000–150,000 km and replaced if slow or faulty. Replace sooner if there’s a check-engine light, poor economy, or confirmed sensor faults on a scan.

Can an oxygen sensor be cleaned instead of replaced?
Not reliably. Once the sensing element is contaminated or slow to respond, replacement with a correct-spec sensor is the proper fix.