Parts for your 2014 Mazda Premacy-Camshaft sensor

2014 Mazda Premacy camshaft sensor: what it does, when to replace, and how to look after it

Technical references including the Mazda Workshop Manual for the CW-series Premacy/Mazda 5 (2010–2015), Mazda’s Electronic Parts Catalogue, and Mazda service diagnostics (DTC lists covering P0340/P0341) confirm the 2014 Mazda Premacy uses a camshaft position sensor (CMP). Both common engines for this model year—the 2.5‑litre MZR (L5‑VE) and the 2.0‑litre SKYACTIV‑G (PE‑VPS, in markets where fitted)—employ a CMP on the cylinder head for valve timing and fuel/ignition control.

The camshaft sensor’s main job is to tell the engine control module exactly where the intake/exhaust cam is in its rotation. That timing info lets the Premacy run sequential fuel injection, fire the coils at the right moment, and command variable valve timing smartly. It’s especially critical for quick starts, clean idle, good economy, and keeping emissions in check. If the CMP signal drops out, the ECU may fall back to a crank‑only strategy or enter limp mode, and starting can be a mission.

While the sensor itself is solid‑state and not a routine service item, it benefits from a quick look during scheduled servicing. Common issues are oil contamination at the connector, a hardened O‑ring weeping oil, or wiring chafed near the head. Keeping engine oil fresh and the right spec helps too—old oil can carry varnish that finds its way to the sensor face.

• Typical symptoms of a crook CMP include: long crank or no start when hot, rough idle, hesitation on take‑off, poor fuel economy, and a check‑engine light with codes like P0340/P0341.
• Before condemning the sensor, rule out wiring faults, loose connectors, and on higher‑kilometre cars, timing chain stretch or correlation issues (sometimes flagged with P0016/P0017).

Thinking about replacement? On the Premacy it’s usually a quick, driveway‑friendly job: disconnect the battery negative, pop the engine cover, unplug the CMP at the cam end of the head, remove the retaining bolt, and ease the sensor out. Lightly oil the new O‑ring, seat the sensor, reinstall the bolt (use the factory torque from the Mazda manual), reconnect, clear codes, and road‑test. Use a genuine or high‑quality aftermarket sensor, cheap units can play havoc with start‑up and VVT behaviour. If faults persist after fitting, it’s worth a deeper look with a scope or a visit to a trusted workshop.

Sources referenced: Mazda Workshop Manual (CW Premacy/Mazda 5), Mazda Electronic Parts Catalogue, Mazda service DTC documentation for CMP (P0340/P0341).

FAQs

Does a 2014 Mazda Premacy have a camshaft sensor, and where is it?
Yes. The CMP is mounted on the cylinder head, typically at the end of the intake cam. On the 2.5‑litre MZR and 2.0‑litre SKYACTIV‑G, it’s accessed under the engine cover near the top of the motor, making it straightforward to reach with basic tools.

What fault codes point to a bad camshaft sensor on a Premacy?
Common codes are P0340 (Camshaft Position Circuit) and P0341 (Camshaft Position Range/Performance). You might also see correlation codes like P0016 if timing or signal alignment is off. Always check the connector and wiring before replacing parts.

Is it safe to keep driving with a dodgy camshaft sensor?
It may run, but it’s not ideal. You can experience hard starting, reduced power, and stalling. Prolonged driving with misfires or poor timing can stress the catalytic converter. Best to sort it sooner rather than later.