Parts for your 2015 Mazda Cx-9-Throttle position sensors

2015 Mazda CX-9 throttle-position-sensors (TPS)

Technical sources confirm the 2015 Mazda CX-9 is fitted with a throttle-position-sensor, integrated within the electronic throttle body. The Mazda Workshop Manual for the 2015 CX-9 (Electronic Throttle Control System section) describes dual-track throttle angle feedback used by the PCM. The Mazda Electronic Parts Catalogue lists the throttle body assembly for this model as containing the actuator motor and internal TPS, rather than a separate stand-alone sensor. Mazda’s OBD-II diagnostic documentation for the CX-9 also references throttle-angle related DTCs (e.g., P0121, P0122, P0123, P2135, P2101), which rely on a functioning TPS signal. Together, these technical references establish that the TPS is relevant and used on the 2015 CX-9.

On the 2015 Mazda CX-9, the throttle-position-sensor lives inside the electronic throttle body under the bonnet, and it’s a key player in how smoothly the big V6 delivers power. It tells the engine computer exactly how far the throttle plate is open, so fuel delivery, ignition timing, idle control, transmission shift strategy and cruise control all stay on point. This model uses a drive-by-wire setup, so there’s also an accelerator pedal position sensor at the pedal, the PCM constantly cross-checks the pedal input with the TPS at the throttle to keep things safe and tidy.

Day to day, the TPS isn’t a normal “service item” in Australia or New Zealand — there’s no set replacement interval. That said, it pays to keep the throttle body clean. If there’s a sticky idle, a flat spot off the line, or the CX-9 suddenly gulps more petrol than usual, a light clean of the throttle bore and plate with proper throttle-body cleaner can help. Don’t force the blade by hand, and avoid soaking the electronics, a soft cloth and minimal spray is the go. If the workshop disconnects the battery or cleans the throttle, an idle relearn or a short drive cycle might be needed so the PCM can recalibrate. A scan tool speeds that up nicely.

If the dash lights up and a scan shows throttle-angle or correlation codes (like P0121 or P2135), it’s time for proper diagnosis. On this CX-9, the TPS is generally non-serviceable on its own, the fix is typically a complete throttle body assembly. Replacement is straightforward for a trained tech: battery negative off, air duct off, electrical connector off, four bolts out, swap the gasket, refit and torque to the workshop spec, then perform the relearn. Using genuine or reputable OE-equivalent parts keeps the shifting crisp and the idle settled. Look out for symptoms such as:

• Erratic idle, stalling at junctions, or hesitation
• Harsh or late gear changes
• Surging cruise control or poor fuel economy
• Check engine light with throttle-related DTCs

Regular servicing under Kiwi and Aussie conditions — clean air filter, no intake leaks, and periodic throttle-body cleaning — goes a long way to keeping the TPS readings stable and the CX-9 happy over hundreds of thousands of kilometres.

Does the 2015 CX-9 have a separate TPS or is it built into the throttle body?

It’s built into the electronic throttle body alongside the actuator motor. If the sensor fails, the usual repair is replacing the throttle body assembly as a unit, rather than swapping a stand-alone sensor.

What are the common signs the TPS is playing up on a 2015 CX-9?

Expect a check engine light, rough or hunting idle, hesitant take-off, harsh shifts, or a surge at steady speeds. Scan tools often show codes like P0121 or P2135 when the TPS signals don’t line up as they should.

Can cleaning fix TPS problems, or does the throttle body need replacing?

If the issue is light carbon causing a sticky throttle plate, a careful clean often helps. If the internal sensor tracks are worn or the signals are out of range, cleaning won’t solve it — a new throttle body assembly is the go.