Parts for your 2013 Nissan Pathfinder-Oxygen sensor

2013 Nissan Pathfinder Oxygen Sensor: What It Does and When to Replace It

Based on the 2013 Nissan Pathfinder (R52) Factory Service Manual (EC – Engine Control) and emissions/OBD requirements used in Australia and New Zealand (e.g., ADR 79 series for light vehicles), this model absolutely uses oxygen-sensing hardware: upstream wideband air–fuel ratio (A/F) sensors and downstream heated oxygen sensors (HO2S) on each bank of the VQ35DE V6. They’re essential for closed-loop fuel control and catalytic converter monitoring, so an oxygen sensor is definitely relevant and fitted to the 2013 Pathfinder.

On this Pathfinder, the upstream A/F sensors constantly feed the ECU fine-grained data on exhaust oxygen so the engine can trim fuel precisely for power, economy and emissions. The downstream O2 sensors sit after the catalytic converters to check that the cats are cleaning up properly. Together, they help the 3.5‑litre V6 run smoothly, keep fuel bills sensible, and avoid unnecessary pollution.

When these sensors age or get contaminated, the engine management has to guess more, which can lead to rough running, higher fuel use, and that annoying check engine light. Common clues include lazy throttle response, a sooty exhaust, increased consumption, or fault codes like P0138, P0140, P0158, P2A00/P2A03 (codes may vary). Left too long, a crook sensor can take out the catalytic converter—an expensive day out.

Servicing tips for a 2013 Nissan Pathfinder oxygen sensor:

• Inspection interval: Have live data and fuel trims checked around the 120,000–160,000 km mark, or sooner if economy drops or a MIL appears. There’s no fixed replacement interval, but many wideband sensors are tired by 160,000–200,000 km.
• Replacement: Use quality, correct-spec A/F and HO2S sensors for each bank. Upstream and downstream are not interchangeable.
• Fitting: Work on a cool exhaust, penetrate threads first. Use an O2 sensor socket, avoid twisting the harness, and don’t contaminate the sensing tip. Most new sensors have pre-coated threads—skip extra anti-seize unless specified.
• After install: Clear codes, reset fuel trims if applicable, and verify closed-loop operation and catalyst monitor readiness with a scan tool.

Keeping the oxygen sensors healthy helps the CVT-equipped R52 feel crisp around town, keeps emissions gear happy, and saves a few dollars at the bowser. If the light’s on or the fuel range is dropping, it’s worth getting the sensors checked before it turns into a bigger repair.

Popular questions about 2013 Nissan Pathfinder oxygen sensors

How many oxygen sensors does a 2013 Pathfinder have?
The VQ35DE V6 in the R52 typically has four in total: two upstream wideband A/F sensors (one per bank) and two downstream heated O2 sensors (one per bank) for catalyst monitoring.

What are the symptoms of a failing oxygen sensor?
Expect higher fuel use, a check engine light, rough idle, hesitation, and sometimes a sulphur smell. Scan data often shows skewed fuel trims or related fault codes, and emissions test results may be off.

Is it safe to drive with a bad oxygen sensor?
Short term, the car will usually run, but it may run rich, foul plugs, or overheat the catalytic converter. It’s best to diagnose and fix promptly to avoid bigger repairs and to keep fuel economy on track.