Parts for your 2016 Nissan Serena-Oxygen sensor

2016 Nissan Serena oxygen sensor: what it does and when to replace it

Technical sources confirm the 2016 Nissan Serena uses oxygen sensors. Nissan’s Electronic Service Manual (ESM) for the C26 Serena (EC section) specifies an upstream Air-Fuel Ratio (A/F) Sensor 1 and a downstream Heated Oxygen Sensor (HO2S) 2 for the MR20-series petrol engine, and the Nissan FAST parts catalogue lists these sensors for 2016 Serena variants. That means an oxygen sensor is absolutely relevant to this vehicle’s servicing and emissions control.

On a 2016 Serena, the upstream A/F sensor (before the catalytic converter) constantly reports how rich or lean the exhaust is so the engine computer can trim fuel on the fly. The downstream oxygen sensor (after the cat) keeps an eye on catalytic converter efficiency. Together they help the Serena run smoothly, save fuel, and meet emissions rules.

They’re not really a “service item” like oil or filters, but they do age. Many will go 100,000–160,000 km before drifting out of spec. If fuel economy drops, there’s a sulphur smell, rough running, or the check engine light pops on with O2/A/F related fault codes, it’s time to test them. A proper diagnosis should check for exhaust leaks, wiring damage, and fuel trim data before calling a sensor bad.

When replacement is needed on a Serena, go for quality—genuine or a reputable aftermarket unit specified for the MR20 engine. Fitment tips that help avoid a repeat visit:

• Locate them correctly: Sensor 1 is in the exhaust manifold/front pipe, Sensor 2 is after the catalytic converter under the floor.
• Fix any exhaust leaks first, as they skew readings.
• Use sensor-safe anti-seize on the threads if it’s not pre-coated, and torque to spec.
• After install, clear codes, verify fuel trims and O2/A/F activity, and complete a drive cycle.

Keeping the Serena’s engine well serviced—fresh oil, good plugs, no vacuum or intake leaks—helps sensors live longer. If the vehicle is mostly short-tripped, consider earlier checks, as condensation and rich cold starts can age sensors faster. Look after the oxygen sensors, and the Serena will repay with smoother running and better kilometres per litre.

Popular questions

How many oxygen sensors does a 2016 Nissan Serena have and where are they?
Most 2016 Serena petrol models have two: an upstream A/F sensor before the catalytic converter (in the exhaust manifold/front tube) and a downstream heated oxygen sensor after the cat under the floor. This setup supports precise fueling and catalyst monitoring.

What fault codes point to a bad oxygen sensor on a Serena?
Common codes include P0131/P0132 (O2 sensor low/high voltage), P0133 (slow response), P0138/P0140 (downstream issues), and A/F sensor-related codes such as P015A/P015B (delayed response). Always check for exhaust leaks or wiring faults before replacing parts.

Can an oxygen sensor be cleaned, or should it be replaced?
They’re not realistically cleanable. Chemicals or wire-brushing can damage the sensing element. If testing shows a lazy or out-of-range sensor, replacement is the reliable fix. Make sure the engine is healthy to avoid fouling a new sensor.