Parts for your 2018 Nissan Serena-Camshaft sensor

2018 Nissan Serena Camshaft Position Sensor: What It Does and When to Replace

Yes, the 2018 Nissan Serena uses a camshaft position sensor. Nissan’s own technical literature for the C27 Serena (Electronic Service Manual, Engine Control section) describes a “Camshaft position sensor (PHASE)” as part of the engine management system. The factory parts catalogue for the C27 likewise lists a camshaft position sensor for the MR20DD 2.0‑litre S-HYBRID and the HR12‑series engine used in the e‑POWER variant. These sources confirm the sensor is fitted and integral to timing, fuel, and ignition control.

On the 2018 Serena, the camshaft position sensor helps the ECU know exactly where the camshaft is relative to the crank. That lets the ECU run sequential fuel injection, manage ignition timing, and control variable valve timing smoothly. In plain terms, it’s how the van keeps cold starts clean, mid‑range pull crisp, and fuel economy tidy across Kiwi and Aussie roads.

It’s not a routine “service item” like oil or filters, but it is worth a check whenever there’s a drivability complaint. A crook cam sensor can cause hard starting, rough idle, hesitant acceleration, higher fuel use, or a check‑engine light. Scan tools will often show fault codes related to cam/crank correlation when the sensor signal is off.

• Typical symptoms of a failing sensor:
  • Extended crank time or stalling after start
  • Flat spots under load, poor economy
  • Check‑engine light with cam/crank sync codes

Replacement on a Serena is straightforward for a trained tech: battery safe‑off, disconnect the sensor plug at the cylinder head area, remove the retaining fastener, swap the sensor, lightly oil the O‑ring, and refit. The correct torque and relearn procedures (if required) should follow the Nissan C27 ESM. It’s smart to inspect the connector and loom for oil ingress or brittle wiring while you’re there, particularly on higher‑kilometre vehicles.

Best practice is to use a quality OEM‑spec sensor and clear codes after installation. If faults return, a deeper look at timing chain stretch, reluctor targets, or ECU grounds may be needed, as the Serena’s ECU relies on both cam and crank signals to stay in sync.

Technical references: Nissan Serena C27 Electronic Service Manual (EC – Engine Control: Camshaft position sensor/PHASE), and Nissan C27 Serena parts catalogue listings identifying the camshaft position sensor for MR20DD and HR12‑series applications.

Is the camshaft sensor on a 2018 Serena a regular service item?

No. It’s monitored by the ECU and is only replaced when faulty. During routine servicing, technicians may inspect the connector, wiring, and any oil contamination around the sensor, especially on higher‑kilometre vehicles.

What are the common signs the camshaft sensor is failing on a Serena C27?

Expect longer cranking, rough idle, flat spots on take‑off, increased fuel use, and a check‑engine light. Scan diagnostics may show cam/crank correlation or phase sensor codes.

Can a bad camshaft sensor damage the engine?

It usually won’t cause mechanical damage by itself, but it can lead to poor running, misfires, or limp‑home behaviour. Leaving it unresolved can stress other components and make the van unreliable, so prompt diagnosis and replacement is wise.