Parts for your 2007 Nissan Serena-Camshaft sensor

2007 Nissan Serena camshaft sensor — what it does and when to replace it

Yes, the 2007 Nissan Serena (C25) uses a camshaft position sensor. Technical sources including the Nissan Factory Service Manual for the C25 (Engine Control, “Camshaft Position Sensor [PHASE]”), and Nissan’s FAST parts catalogue (typical part family 23731-xxxxx) confirm a dedicated camshaft sensor is fitted on MR20DE petrol models, and likewise on the M9R diesel where it’s used for precise injection timing. It’s a critical input to the ECM and very much relevant to this vehicle.

On a 2007 Serena, the camshaft sensor tells the engine computer exactly where the cam is in its rotation. That lets the ECM sync fuel injection to the correct cylinder, manage ignition timing, and operate Nissan’s variable valve timing (CVTC) on the MR20DE. If the signal goes missing or erratic, the van can stumble, crank longer, or log fault codes like P0340/P0345. In some cases it will drop into limp mode to protect the engine.

Typical signs the cam sensor needs attention include:

• Hard starting, especially warm restarts
• Rough idle, flat spots, or poor fuel economy
• Check Engine Light with cam/crank correlation codes
• Occasional stalling at low speed

Replacement on the Serena is usually straightforward. The sensor sits on the cylinder head (top/front area on the MR20DE), held by a single small bolt and sealed with an O-ring. Disconnect the battery, unplug the connector, remove the bolt, twist the old sensor out, lightly oil the new O-ring, and install the new unit. Tighten to factory spec, reconnect, clear codes, and road test. Always inspect the harness and connector for oil ingress or broken locking tabs, a tired connector can mimic a faulty sensor. Using a quality OEM or reputable aftermarket sensor avoids repeat faults and odd hot/cold behaviour.

There’s no scheduled service interval for the cam sensor, it’s replaced on condition. Keeping the top of the engine clean, fixing oil leaks promptly, and ensuring the connector stays dry will help the sensor live a long life. For the diesel M9R, the same logic applies—the ECM relies on that cam signal for accurate high-pressure injection timing, so a clean signal equals smooth, efficient running across Aussie and Kiwi kilometres.

• Is it safe to keep driving with a faulty camshaft sensor on a 2007 Serena?
  Short trips might be possible, but it can stall, run rich, or lose power. It’s best to diagnose and repair promptly to avoid getting stranded and to protect the catalyst.
• Do I need to replace the crank sensor at the same time?
  Not necessarily. They’re separate parts. If diagnostics show only cam sensor faults and the wiring’s sound, replace just the cam sensor. If correlation codes persist, check both sensors and the timing chain stretch.
• Will a new cam sensor need programming?
  No programming is required. Fit the sensor, clear fault codes, and perform a road test. The ECM will relearn synchronisation automatically.