Parts for your 2018 Mazda Cx-5-Camshaft sensor

2018 Mazda CX-5 Camshaft Sensor

Technical sources confirm the 2018 Mazda CX-5 does use a camshaft position sensor (CMP). Mazda’s workshop manual for the CX-5 (KF) engine control system lists a CMP sensor for the SKYACTIV-G 2.5 petrol and SKYACTIV-D 2.2 diesel engines, and Mazda service information includes related DTCs such as P0340/P0341 for CMP circuit performance. Component location and wiring diagrams in the factory manual also show the sensor mounted on the cylinder head near the timing chain cover.

On the 2018 CX-5, the camshaft sensor keeps the engine management right on song. It tracks the exact position of the camshaft so the PCM can fire the injectors in sequence, control spark timing (petrol), and manage valve timing via S-VT/VVT. It’s also critical for smooth i‑stop restarts and for correlating cam and crank signals to detect misfires. When the CMP goes out of whack, it can cause long cranking, rough idle, reduced power, or a check engine light.

There’s no routine replacement interval for the camshaft sensor—it’s a replace-on-failure item. Still, it benefits from good habits. Keeping the correct spec engine oil and timely oil changes helps valve timing hardware behave, which in turn keeps the sensor’s job straightforward. During servicing, a quick visual check under the bonnet for oil leaks onto the sensor connector, brittle wiring near the rocker cover, or disturbed harness clips is worth the minute it takes.

Typical symptoms of a crook CMP on a CX-5 include:

• Hard starting or stalling after start
• Uneven idle and flat spots on acceleration
• Poor fuel economy and limp-home behaviour
• Check engine light with codes like P0340, P0341, or cam/crank correlation faults

Replacement is a straightforward job for most workshops: remove the engine cover, unplug the connector, take out the retaining bolt, ease the old sensor out, lightly oil the new O‑ring, fit the new sensor, and reconnect. After that, clear codes and verify live data for cam/crank sync. On high‑kilometre vehicles, it’s smart to inspect the loom for chafing and ensure connectors are clean and dry before calling it done.

Owners in Australia and New Zealand can expect a modest labour time (often around half an hour to an hour) and a part cost that varies with brand. Genuine or quality aftermarket sensors are recommended to maintain stable timing control and avoid repeat faults.

FAQs

Where is the camshaft sensor on a 2018 Mazda CX-5?

It’s mounted on the cylinder head near the timing chain cover. Access is from the top—pop off the engine cover and you’ll see the sensor secured by a small bolt with a plug-in electrical connector. Exact orientation differs slightly between the petrol and diesel variants, but both are easy to spot with the cover removed.

What codes point to a bad camshaft sensor on a CX-5?

Common CMP-related codes include P0340 (Camshaft Position Sensor Circuit) and P0341 (Range/Performance). You might also see cam/crank correlation faults. Always confirm with live data and wiring checks, as issues like damaged loom sections or poor connector contact can mimic a failed sensor.

Can a faulty camshaft sensor cause no-start or stalling?

Yes. A failing CMP can lead to long cranking, intermittent stalling, or a no‑start, especially when hot. The PCM relies on a clean cam signal for sequential injection and timing decisions. If the signal drops out, the engine may run rough or shut down until the signal returns.