Parts for your 2001 Nissan Serena-Camshaft sensor

2001 Nissan Serena Camshaft Sensor: What It Does and When to Replace It

Based on technical documentation, the 2001 Nissan Serena (C24) is fitted with a camshaft position sensor. The Nissan Electronic Service Manual (ESM) for the C24 lists a “Camshaft Position Sensor (PHASE)” as an ECM input for both the QR20DE petrol and YD22DDTi diesel engines, and details diagnostic trouble codes such as P0340 related to this sensor. The Nissan FAST parts catalogue for the C24 platform also lists a dedicated camshaft position sensor assembly for these engines. So it’s absolutely relevant on a 2001 Serena.

On a 2001 Serena, the camshaft sensor helps the engine computer figure out exactly where the intake cam is in its rotation. That timing info is crucial for sequential fuel injection, ignition timing and, on the QR20DE, the intake-side variable valve timing (CVTC). When the sensor’s working properly, cold starts are cleaner, throttle response is crisper, and fuel economy is better. When it’s not, expect rough starting, uneven idle, flat spots, and the odd stall. The check engine light usually shows up with a code like P0340.

There’s no scheduled service for the cam sensor itself, but a few habits help it live a long life:

• Keep up with oil changes. Sludgy oil and stretched timing chains can cause cam/crank correlation faults that look like a bad sensor.
• Protect the loom. Heat and vibration can chafe the wiring near the head and timing cover.
• Fix oil leaks. Oil intrusion into the connector can upset the signal.

Replacement is straightforward for a competent home mechanic:

1. Disconnect the battery negative under the bonnet.
2. Locate the sensor on the cylinder head (intake side near the timing chain cover on QR20DE, similarly positioned on YD22DDTi).
3. Unplug the connector, remove the retaining bolt, and ease out the sensor.
4. Lightly oil the new O-ring, install the new sensor, and refit the bolt and plug.
5. Clear fault codes and check live data, no special programming is normally required.

If faults persist, don’t just throw parts at it. The ESM outlines checks for power supply, ground integrity, and signal waveform. A failing crank sensor or timing chain wear can mimic a cam sensor fault. Using a quality OEM or reputable aftermarket part is wise—cheap copies can be hit and miss. For most owners across Australia and New Zealand, pairing a fresh sensor with tidy wiring and regular servicing keeps the Serena starting first pop and running sweet.

Popular questions about 2001 Nissan Serena camshaft sensor

Does a 2001 Nissan Serena have a camshaft sensor?
Yes. The C24 Serena uses a camshaft position sensor (PHASE) as an engine control input on both the QR20DE petrol and YD22DDTi diesel engines. The factory ESM also lists DTCs like P0340 tied to this sensor.

Where is the camshaft sensor located on a 2001 Serena?
It’s mounted on the cylinder head, typically on the intake side near the timing chain cover. Access is from the top, unplug the connector, remove a single retaining bolt, and the sensor slides out with an O-ring.

Is it safe to drive with a faulty camshaft sensor?
It may run, but starting can be hard, performance can drop, and it can stall. Best not to keep driving—get it diagnosed and sorted promptly to avoid getting stranded and to protect the engine.