Parts for your 2018 Mazda Cx-5-Crank angle sensor

2018 Mazda CX-5 crank angle sensor

Technical sources confirm the 2018 Mazda CX‑5 (KF) is fitted with a crank angle sensor, commonly called the Crankshaft Position (CKP) sensor. Mazda’s Workshop Manual for CX‑5 (2017–2019) includes sections titled “Crankshaft Position (CKP) Sensor” and diagnostics for DTC P0335/P0336, the Mazda Electrical Wiring Diagram shows the CKP circuit to the PCM, and Mazda’s parts catalogue lists a CKP sensor for SKYACTIV‑G 2.0/2.5 and SKYACTIV‑D 2.2 engines. These OEM documents establish the sensor as standard kit on this model.

On a 2018 Mazda CX‑5, the crank angle sensor is a small but crucial bit of gear. It tracks crankshaft position and speed so the ECU can fire the spark and inject fuel at exactly the right moment. It also provides a reference for variable valve timing, misfire detection, and smooth idle‑stop restarts (i‑Stop). Paired with the cam sensor, it keeps the SKYACTIV engine running sweet as under all loads and temps.

It isn’t a scheduled service item, but it pays to give it some attention when chasing drivability gremlins. Typical signs of a crook CKP include hard starting (hot or cold), random stalls, no‑start with cranking, rough running, the tacho dropping out, and a check engine light with codes like P0335/P0336. Because the sensor reads a toothed reluctor on the crank, any damaged wiring, oil intrusion at the O‑ring, or metal fuzz stuck to the tip can throw the signal off.

For the CX‑5, the sensor is mounted near the crank—on most SKYACTIV‑G petrols it’s at the rear of the block by the bellhousing, on the SKYACTIV‑D the position varies but the job’s the same. During servicing or diagnosis:

• Visually inspect the connector and harness routing for chafe, heat damage, or oil contamination.
• If fault codes are present, confirm with live data or an oscilloscope rather than guessing.
• If replacing, use a quality OEM‑spec sensor. Lightly oil the new O‑ring, seat it square, and torque the retaining bolt to workshop spec.
• Keep the sensor tip clean, don’t pry against it, and don’t pack sealant near the bore.
• After fitment, clear codes, perform an idle learn if required, and road‑test hot and cold.

There’s no need to swap one out pre‑emptively, just make sure the area stays clean and the loom is secure. Done right, the car will start crisply, idle neatly, and the ECU will have the clean signal it needs to keep fuel economy and performance on point—no dramas.

FAQs

Where is the crank angle sensor on a 2018 Mazda CX‑5?
On most SKYACTIV‑G 2.0/2.5 petrol engines it’s mounted near the rear of the engine block by the transmission bellhousing, reading a reluctor on the crank. On the SKYACTIV‑D 2.2 it’s also at the crank but the exact spot differs slightly. Access is typically from underneath with the car safely supported.

Does the crank angle sensor need regular servicing?
There’s no routine replacement interval. It’s treated as “inspect as needed”: check the connector, loom, and for oil leaks at the O‑ring during services. Replace only if diagnostics confirm a fault or the sensor shows physical damage.

Can a faulty CKP sensor cause a no‑start?
Yes. If the ECU loses a reliable crank signal, it won’t know when to fire spark or inject fuel, so it may crank but not start. Intermittent faults can also cause random stalls or rough running, especially when hot.