Parts for your 2011 Nissan Serena-Camshaft sensor

2011 Nissan Serena camshaft sensor — purpose, servicing, and advice

Yes, the 2011 Nissan Serena (C26 series, typically with the MR20DE 2.0-litre petrol) uses a camshaft position sensor. Technical references include the Nissan Electronic Service Manual (C26, Engine Control section), which identifies the Camshaft Position Sensor (often labelled “PHASE”) and outlines diagnostics such as DTC P0340/P0345 for cam sensor circuits. Major OEM and aftermarket catalogues also list a dedicated camshaft sensor for this model and engine.

On the Serena, the camshaft sensor’s job is to tell the engine control module exactly where the camshaft sits in its rotation. That live timing info lets the ECU sync ignition and sequential fuel injection, manage variable valve timing, and keep cold starts clean and quick. Without a good signal, the timing gets messy: it can crank longer, idle roughly, drop power, or throw the check engine light. The sensor sits on the cylinder head near the cam, reading a toothed trigger on the camshaft. It works hand-in-glove with the crankshaft sensor to keep everything in step under the bonnet.

As part of servicing of your 2011‑Nissan‑Serena camshaft‑sensor, it’s not a regular “replace by kilometres” item, but it is worth a quick look whenever the plugs are due or the rocker cover area is being checked. Inspect the connector for broken clips, oil intrusion, or green corrosion, and make sure the loom isn’t rubbing through. If there’s a related fault code, a tech will usually confirm power, ground, and signal with a meter or scope before swapping parts. When replacement is needed, a quality OEM‑equivalent sensor with a fresh O‑ring is the go. Fitment is straightforward: disconnect the battery, remove the retaining bolt, ease the sensor out, lightly oil the new seal, install it square, and tighten to the workshop‑specified torque. Clear the codes and road‑test, no special relearn is typically required on this engine. Keeping oil changes on schedule also helps, as clean oil supports accurate cam phasing and protects the sensor from sludge and vapour contamination.

• Common signs: hard starting, rough idle, hesitation, poor economy, check engine light (e.g., P0340).
• Check wiring first, many “sensor failures” are actually connector or loom issues.
• A scan tool and live data help confirm sync between cam and crank.
• Avoid cheap no‑name sensors, false signals can be worse than a flat one.
• If oil is found in the plug, fix the leak source before refitting.
• Always follow the service manual for specs and safe procedures.

Popular question: How many camshaft sensors does a 2011 Serena have?

Most 2011 Serena C26 models with the MR20DE inline‑four use a single camshaft position sensor (PHASE). Some engines in other vehicles use two, but the Serena’s MR20DE generally runs one on the cam.

Popular question: Can a bad camshaft sensor stop a Serena from starting?

It can. A failing sensor may cause long cranking, intermittent no‑start, or a stall. The ECU needs a clean cam signal to sync fuel and spark, especially during start‑up.

Popular question: What’s the typical cost and time to replace it?

On these, replacement is usually quick—often 15–45 minutes. In Australia or New Zealand, expect a quality sensor to run roughly $80–$200, plus similar labour depending on the workshop.