Parts for your 2009 Mazda Premacy-Crank angle sensor

2009 Mazda Premacy crank angle sensor (crankshaft position sensor)

Yes, the 2009 Mazda Premacy is fitted with a crank angle sensor (commonly called a crankshaft position or CKP sensor). This is confirmed in Mazda’s CR-series Premacy/Mazda5 Workshop Manual (engine control system and wiring sections), Mazda’s Electronic Parts Catalogue listings for the CR3W/CREW models (which itemise a CKP sensor for the 1.8, 2.0 and 2.3 MZR petrols and 2.0 diesel), and independent technical databases such as Autodata/Haynes that show the CKP input to the PCM and relevant DTCs (P0335–P0339) for this vehicle.

On the 2009 Premacy, the crank angle sensor is a key input for the engine computer. It tracks crankshaft speed and position so the PCM can fire the coils and injectors at the right moment, manage idle and fuel trims, and detect misfires. It works in tandem with the cam sensor to keep timing spot-on, especially during starting and when the revs change quickly. If it goes out of whack, the engine can be hard to start, stumble, or stop altogether.

• Common symptoms when it’s failing: long crank/no start, intermittent stalling when hot, rough idle, poor throttle response, dead tach during crank, and fault codes like P0335–P0339.
• Typical location: mounted near the crank pulley at the front timing cover on the MZR petrols, reading a toothed wheel, on some variants it can be near the transmission bellhousing.

Replacement and servicing on a 2009 Premacy is pretty straightforward for a competent home mechanic, but many owners prefer a workshop to handle it. It’s not a scheduled replacement item, so it’s done when there are symptoms or a confirmed fault. A genuine or high-quality OEM-equivalent sensor is worth it, cheapies can give erratic signals. Always inspect the wiring and connector first—heat and oil can make the loom brittle near the front of the engine.

1. Disconnect the battery and let the car cool. Pop the bonnet and remove the engine cover if fitted.
2. Access the sensor at the front of the engine (near the crank pulley). Unplug the connector and remove the retaining bolt.
3. Lightly oil the O-ring on the new sensor, seat it square, and torque the bolt to spec (typically around 8–10 Nm for the M6 fastener—check the service data for your exact engine).
4. Reconnect, clear any codes, and check live data for a steady CKP signal. Most Premacy models don’t need a special relearn for a sensor swap, an idle relearn after battery-off is usually enough.

Good practice during regular services: keep an eye out for oil leaks at the front cover, ensure the harness clips are intact, and clear debris so the sensor face and reluctor wheel stay clean. If the car shows intermittent hot stalls or random no-starts, testing the CKP signal with a scan tool or oscilloscope can save a lot of guesswork.

Where is the crank angle sensor on a 2009 Mazda Premacy?

On most 2009 Premacy petrol models it sits by the front crank pulley at the timing cover, reading a toothed reluctor on the crank. Some diesel variants place it near the bellhousing. Access is from the top or wheel arch, removing the engine undertray may help.

What are the signs the Premacy’s crank angle sensor is failing?

Hard starting, random stalling when hot, uneven idle, no tach movement during cranking, and engine light with codes P0335–P0339 are classic. If wiggling the harness near the sensor changes the symptom, the wiring may be the culprit.

Does the PCM need a relearn after replacing the sensor?

Usually no special CKP relearn is required on this model—just clear codes and perform a basic idle relearn after reconnecting the battery. If the PCM has been replaced or updated, follow the service tool prompts for any learned value resets.