Parts for your 2008 Nissan Serena-Camshaft sensor

2008 Nissan Serena Camshaft Sensor: What It Does and When to Replace It

Is a camshaft sensor relevant on a 2008 Nissan Serena? Yes. The C25-series Serena (2005–2010), including the 2008 model, uses a camshaft position sensor across its common engines. The MR20DE 2.0-litre petrol and the M9R 2.0-litre diesel both specify a camshaft position sensor in the factory literature. Technical references include the Nissan Serena C25 Electronic Service Manual (EC/Engine Control sections), which identifies the “Camshaft Position Sensor (PHASE)” as an input to the ECM, and Nissan’s parts catalogue (FAST) listing a camshaft sensor for C25 variants. Renault–Nissan documentation for the M9R likewise shows a camshaft position sensor used for injection timing and sync.

On a 2008 Serena, the camshaft sensor is a small, three-wire Hall-effect sensor that lets the engine computer know exactly where the cam is relative to the crank. That matters for sequential fuel injection, variable valve timing (CVTC on MR20DE), quick starts, and clean emissions. Without a clean signal, the van can be hard to start, stumble off idle, or drop into limp mode.

Typical signs it’s on the way out include:

• Check Engine Light with codes like P0340/P0345 (cam position circuit) or cam/crank correlation faults
• Long crank, misfires at low revs, poor fuel economy
• Intermittent stalling when hot, then restarting after it cools

It isn’t a regular service item, but it’s smart to inspect it during major services—especially on higher‑kilometre Serenas. A quick visual under the bonnet for oil intrusion at the connector, brittle wiring, or damaged loom is worthwhile. Keeping up with good-quality engine oil and timely changes also helps the cam timing system behave, reducing false correlation faults that can look like a sensor issue.

Replacement is straightforward for most home spanner‑spinners: disconnect the battery, unplug the sensor, remove the retaining bolt, swap the sensor, and reconnect. On MR20DE it’s mounted at the cylinder head (intake cam side), on M9R it’s similarly positioned at the cam housing. Always check the service manual for bolt torque and any relearn steps—some scan tools can run a cam/crank relearn to tidy things up. Aftermarket units can work fine, but many techs prefer genuine or reputable OE‑equivalent sensors to avoid choppy signals and repeat faults.

If the Serena is showing the above symptoms, confirm with a scan for codes and live data (look for a stable cam signal and correct sync). When in doubt, rule out wiring first—many “bad sensors” turn out to be tired connectors or a rubbed‑through harness.

Popular questions about 2008 Nissan Serena camshaft sensors

Where is the camshaft sensor located on a 2008 Serena?
On MR20DE petrol engines it’s fitted to the cylinder head near the intake cam gear, accessible from the top/front of the engine. On the M9R diesel it’s mounted at the camshaft housing. Look for a small three‑pin connector leading to a compact sensor secured by a single bolt.

What fault codes point to a bad camshaft sensor on a Serena?
Common codes are P0340 or P0345 (camshaft position circuit) and sometimes cam/crank correlation faults. Hard starting, stalling, or loss of power alongside these codes makes the sensor or its wiring a prime suspect. Always check the loom and connectors first.

Is it safe to drive with a failing camshaft sensor?
The van may run, but it can be hard to start, drop into limp mode, or stall unpredictably. It’s best to sort it promptly to avoid getting stranded and to prevent misdiagnosis of other timing-related faults.