Parts for your 2013 Mazda Cx-9-Crank angle sensor

2013 Mazda CX-9 crank angle sensor (crankshaft position sensor)

The 2013 Mazda CX-9 is fitted with a crank angle sensor, more commonly listed in Mazda documentation as the crankshaft position (CKP) sensor. This isn’t optional or irrelevant—it’s a primary engine management input. Technical sources that confirm its presence include the Mazda Workshop Manual for the 2013 CX-9 (Engine Control System diagnostics, which detail DTCs such as P0335/P0339 for CKP circuit faults), Mazda’s electronic parts catalogue listings for a “crankshaft position sensor” on the 3.7L MZI V6, and the Ford Cyclone/Duratec 3.7L engine technical references on which the CX-9’s V6 is based, all of which specify a CKP sensor at the front timing cover reading a toothed wheel on the crank.

On this CX-9, the crank angle sensor tells the powertrain control module exactly where the crank is in its rotation and how fast it’s spinning. That info is used to time spark and fuel injection, manage variable valve timing, and keep the whole show running smoothly. If the signal goes missing or flaky, expect hard starting, sudden stalls, misfires, a dead tach, or a no-start.

While the sensor itself isn’t a scheduled service item, it’s smart to give it a once-over during major services—especially on higher-kilometre vehicles. A quick visual under the bonnet (best access is from the right-hand wheel arch with the splash shield off) to check the sensor body, bracket, and the connector for oil contamination, damaged pins, or chafed wiring can save a drama later. Oil leaks from the front cover or harmonic balancer area can migrate onto the connector—clean that up and sort the leak if spotted.

Replacement is straightforward for a competent DIYer: disconnect the battery negative, raise and support the vehicle, remove the RH front wheel and inner guard panel, unplug the sensor, remove the retaining bolt, and swap in the new unit with a light smear of clean engine oil on the O-ring. Refit and tighten to factory spec, reconnect, and clear codes. Where applicable, use a capable scan tool to run the crankshaft profile/idle relearn so the ECU knows the new signal characteristics. Stick with quality OEM or OE-equivalent parts—cheap copies can cause intermittent no-starts that’ll drive anyone spare.

Handy tips:

• Keep wiring clipped away from the belt drive—heat and vibration are the enemy.
• If it’s intermittently stalling when hot, wiggle-test the harness with a scan tool on live data to spot dropouts.
• After battery disconnect, allow the ECU to relearn idle—let it sit and idle with all accessories off, then with A/C on.

FAQs

Where is the crank angle sensor on a 2013 Mazda CX-9?
It’s mounted on the front of the engine at the timing cover, reading a reluctor on the crankshaft near the harmonic balancer. Access is easiest through the right-hand wheel arch after removing the inner splash shield.

What are common symptoms of a failing crank angle sensor on a CX-9?
Hard starting, random stalls (especially hot), misfires, no tach signal during cranking, and a no-start are typical. The check engine light often logs CKP-related codes like P0335 or P0339.

Do you need a relearn after replacing the CX-9 crank angle sensor?
Often yes. Many scan tools support a crank/cam correlation or idle relearn on this platform. While it may run without it, performing the relearn helps restore smooth idle, accurate misfire monitoring, and clean restarts.