Parts for your 2020 Mazda Cx-5-Crank angle sensor

2020 Mazda CX-5 crank-angle sensor — what it does and how to look after it

Based on Mazda technical literature for the KF-series CX-5 (2020) — including the Mazda Workshop Manual sections covering the Engine Control System, the Crankshaft Position (CKP) Sensor diagnostics (DTCs P0335–P0339, P0315), and the engine wiring diagrams for Skyactiv-G 2.5 and Skyactiv-D 2.2 — the 2020 Mazda CX-5 is fitted with a crank-angle sensor (commonly called the crankshaft position or CKP sensor). It’s a core input to the PCM/ECU and absolutely relevant to starting, timing, and smooth running on this model.

On a 2020 Mazda CX-5, the crank-angle sensor tracks the exact position and rotational speed of the crankshaft via a toothed reluctor wheel. The ECU uses this signal to fire the spark at the right moment on petrol variants, time fuel injection precisely, and coordinate with the cam sensor for accurate synchronisation and misfire detection. On diesel models, it’s equally crucial for injection timing and engine protection strategies. Without a clean CKP signal, the CX-5 can be hard to start, run roughly, or not start at all.

This sensor isn’t a routine service replacement item, but it does benefit from a quick check during major services — particularly the connector, harness routing, and any signs of oil contamination or damage under the bonnet. Keeping the area free of grime and making sure nearby oil leaks are fixed helps the sensor keep doing its job.

Common symptoms suggesting attention or replacement include:

• Intermittent stalling, long crank or no-start
• Rough idle, hesitation, misfire, or reduced power
• Check Engine Light with DTCs such as P0335–P0339 or P0315
• Erratic or zero tachometer reading during cranking

Basic replacement guidance for a competent tech goes like this: disconnect the battery, gain access to the sensor (location varies by engine — generally near the crank pulley or transmission bellhousing), unplug the connector, remove the retaining bolt, and ease out the sensor. Lightly oil the new O-ring, seat the new unit squarely, and tighten the fastener to the workshop-specified torque. Always clear codes, perform a relearn if the manual calls for it, and verify the signal and idle quality on a quick test drive.

DIYers should stick to OEM-quality parts, avoid tugging on the harness, and follow the Mazda Workshop Manual torque values and procedures. For many workshops, the job’s a straightforward 30–60 minute task, provided access is reasonable on the specific engine variant.

FAQs

Does the 2020 Mazda CX-5 have a crank-angle sensor?
Yes. Mazda’s workshop documentation for the KF-series lists a CKP (crankshaft position) sensor as a primary ECU input on both petrol and diesel engines, with dedicated diagnostics and wiring.

What are the signs the crank-angle sensor is failing on a CX-5?
Hard starting, stalling, rough running, or a dead tach during cranking are common. The Check Engine Light often flags codes like P0335–P0339 or P0315 related to the CKP signal.

Is it replaced during regular servicing?
No. It’s not a scheduled replacement item. During services, a quick visual check of the connector, wiring, and nearby oil leaks is smart. Replace the sensor only if it’s faulty or contaminated and diagnostics point to it.