Parts for your 2019 Mazda Cx-5-Camshaft sensor

2019 Mazda CX-5 camshaft sensor — what it does and how to look after it

Technical references confirm the 2019 Mazda CX-5 is fitted with a camshaft position sensor. The Mazda Workshop Manual and wiring diagrams for Skyactiv-G 2.5/2.5T and Skyactiv-D 2.2 engines identify a CMP (camshaft position) sensor used by the PCM for sequential fuel injection and valve timing control. Mazda’s electronic parts catalogue for the 2019 CX-5 also lists the camshaft position sensor as a serviceable component.

The 2019 Mazda CX-5 uses a camshaft position sensor to tell the engine computer exactly where the cam is in its rotation. That live signal lets the ECU synchronise sequential fuel injection and ignition timing, and command Mazda’s variable valve timing for smooth idle, crisp response, and good economy. Without a reliable cam signal, the engine can struggle to start, run roughly, or drop into limp mode. On both Skyactiv-G petrol and Skyactiv-D diesel variants, the sensor works hand‑in‑hand with the crank sensor so the ECU can keep valve events and spark perfectly lined up from cold start to wide‑open throttle.

Common hints that the cam sensor needs attention include the check engine light and hard starting, but a scan tool is the best guide. Typical fault codes are P0340 or P0341, and live data will show whether the ECU is seeing a clean cam signal. Before replacing parts, inspect the connector and harness, especially around the top timing cover, for oil contamination or damaged wiring. Other drivability clues can be:

• rough idle or stalling
• loss of power and poor fuel economy
• extended crank time, especially when hot

Unlike oil and filters, the cam sensor isn’t a scheduled service item on a CX-5, it’s replaced only when testing proves it faulty. Keeping the top of the engine clean, fixing any rocker cover leaks quickly, and making sure the wiring is clipped correctly will help the sensor live a long life. If replacement is required, allow the engine to cool, disconnect the battery negative, then unplug the sensor, remove its single retaining bolt, and withdraw the unit with a slight twist. Lightly oil the new O‑ring, seat the new sensor, and tighten the bolt to the workshop‑manual spec. Clear codes, start the car, and verify cam/crank correlation and VVT operation on a scan tool.

Most CX-5s won’t need special programming after a cam sensor swap, the ECU relearns synchronisation during the first few starts and drives. If a DTC returns, check for timing chain stretch, damaged reluctor, or wiring faults before condemning a new sensor. Use genuine parts for consistent long‑term reliability.

Where is the camshaft sensor located on a 2019 Mazda CX-5?

It’s mounted on the cylinder head near the front of the engine by the timing cover. Look for a small sensor with a single retaining bolt and a three‑pin electrical connector. Access is from the top of the engine bay once the cosmetic cover is off.

On both petrol and diesel models it’s in a similar top‑front position, though exact side can differ. If in doubt, follow the harness from the timing cover area.

Do camshaft sensors need regular servicing on a CX-5?

No, they’re not a scheduled maintenance item. During regular services, it’s smart to check the area for oil leaks, ensure the wiring is secure, and keep the top of the engine clean so grime doesn’t affect the connector.

Only replace the sensor if diagnostics point to a fault. A quick scan for related DTCs and a visual inspection will usually tell the story.

Is it safe to drive with a faulty camshaft sensor?

It may start and run, but behaviour can be unpredictable — hard starting, stalling, or reduced power are all possible. That’s not ideal in Aussie or Kiwi traffic.

Best bet is to have it diagnosed promptly. If the car is stalling or won’t restart when hot, arrange a tow rather than risking a roadside drama.