Parts for your 2012 Nissan Pulsar-Crank angle sensor

2012 Nissan Pulsar crank-angle sensor: what it does and how to look after it

Yes, a crank-angle sensor is fitted and very relevant on the 2012 Nissan Pulsar. Nissan’s factory service manuals for the B17/C12 Pulsar (Engine Control section for the MRA8DE and MR16DDT engines) specify a crankshaft position sensor—functionally the crank‑angle sensor—used by the ECU for ignition and injection timing. Nissan’s parts catalogues list the sensor at the transmission bellhousing/engine block interface, and independent data services (Autodata/Autoinfo) and common DTC references (e.g., P0335/P0336) also confirm its use on this model.

On the 2012 Pulsar, the crank-angle sensor (often called the crankshaft position or CKP sensor) tracks the crank’s exact position and speed. The ECU uses that signal to fire the coils, time the injectors and keep idle, fuel economy and emissions in check. If the signal goes missing or erratic, the engine may crank without starting, stumble, or drop into limp mode. On the MRA8DE and MR16DDT engines, the sensor sits low on the block near the gearbox—easy enough to get to with the car safely raised.

This isn’t a routine “replace every X kilometres” item, but it should be checked during servicing. A good workshop will scan for pending codes, look for oil wicking into the plug, confirm the harness isn’t rubbing through on the bellhousing, and make sure the connector seal is clean and clipped home. If there’s a no‑start when hot, random stalling at idle, or a sudden rev counter drop with a Check Engine Light, the CKP moves to the top of the suspect list.

Replacement is straightforward with basic tools: disconnect the battery, access the sensor from underneath, unplug, remove the retaining bolt, and twist the old sensor out. Lightly oil the new O‑ring, seat it squarely, and refit. Quality matters here—genuine Nissan or a reputable OEM brand helps avoid signal noise that can trigger repeat faults. After fitting, some scan tools offer a “CKP/CMP relearn”, it’s good practice if available, especially if a cam sensor or timing work has been done recently.

Handy tip: keep the area dry. Oil leaks from the rear main or rocker cover that track down to the sensor can contaminate the connector over time. Catching those weeps early saves dramas later and keeps the Pulsar running sweet.

• Common warning signs: hard starting when hot, intermittent stalling, poor throttle response, CEL with codes like P0335.
• Service touchpoints: scan for codes, inspect wiring/connector, verify clean mounting and correct seating of the O‑ring.
• Parts choice: stick to OE or high‑quality aftermarket, cheap sensors can cause unstable signals.

Where is the crank-angle sensor on a 2012 Pulsar?
It’s mounted low on the engine block, at the transmission bellhousing area. From under the front of the car, look where the engine meets the gearbox—there’s a small sensor with a single bolt and a two‑pin plug.

Access is usually from underneath with the splash shield off. Always support the vehicle safely before diving in.

What are the signs the sensor is failing?
Typical symptoms include a no‑start or long crank, sudden stalling at idle or when hot, rough running and a Check Engine Light. Scan tools often show DTCs like P0335 or P0336, and the tacho may drop out when the issue occurs.

If those show up, checking the sensor, its wiring and connector is a smart first step.

Does it need programming after replacement?
The Pulsar will usually start without special programming. However, if your scan tool supports it, performing a CKP/CMP relearn is recommended—especially if timing components or the cam sensor have also been changed.

A relearn helps the ECU sync signals quickly, reducing the chance of repeat fault codes.