Parts for your 2017 Mazda Cx-5-Throttle position sensors

2017 Mazda CX-5 throttle position sensor (TPS): what it does and how to look after it

Technical sources confirm the 2017 Mazda CX-5 is fitted with throttle position sensors. The Mazda Workshop Manual for the KF series describes an electronic throttle body using dual throttle position (TP) sensors for redundancy, the factory wiring diagrams show TP sensor 1 and TP sensor 2 circuits to the PCM/ECU, Mazda’s OBD-II fault list includes TP-related DTCs (P0121–P0123, P0221–P0223, P2135), and the Mazda parts catalogue lists the electronic throttle body assembly with integrated TP sensors. On this model the TPS is built into the throttle body, it’s not a separate bolt-on switch like older cars.

The TPS on a 2017 CX-5 tells the ECU exactly how far the throttle plate is open, so the engine can meter fuel, spark timing, idle control and even transmission shift behaviour. The CX-5 uses two TP sensors inside the electronic throttle body for safety, the ECU constantly cross-checks both signals. That makes throttle response smooth, cruise control stable, and cold starts more dependable.

There’s no scheduled replacement interval for the TPS on this Mazda. It’s a “replace on fault” item, and because the sensors are integrated, the usual fix is to replace the entire throttle body if testing confirms a sensor fault. Common signs of trouble include:

• Check Engine Light with codes like P0121–P0123, P0221–P0223 or P2135
• Sluggish or erratic throttle response, limp-home mode, rough idle or stalling
• Harsh shifts or cruise control dropping out

Good servicing habits help the TPS live a long life:

• Keep the air filter fresh and the intake ducting tight so dust and oil don’t gum up the throttle plate.
• If cleaning the throttle body, use throttle-safe cleaner sparingly, don’t flood the shaft, and avoid forcing the plate by hand.
• If the throttle body is removed, fit a new gasket, torque to spec, and perform an idle/throttle relearn with a scan tool. Some relearns can occur after key-on cycles and a short idle period, but a proper scan-tool routine is best.
• Don’t mix it up with the accelerator pedal position (APP) sensor at the pedal, different part, different diagnostics.

When replacement is needed, choose a quality OEM or OE-equivalent throttle body, clear codes, carry out the relearn, and road test. A quick post-service check of live data for TP1/TP2 agreement and idle airflow keeps things tidy and avoids comebacks.

Popular questions

Does the 2017 Mazda CX-5 have a separate throttle position sensor?
On this model the TPS isn’t a standalone sensor. It’s built into the electronic throttle body as two matched sensors. If one fails and testing confirms it, the repair typically involves replacing the throttle body assembly rather than a separate sensor.

What fault codes point to a TPS issue on a 2017 CX-5?
Codes such as P0121, P0122, P0123, P0221, P0222, P0223 and P2135 commonly relate to throttle position correlation or circuit performance. Always verify wiring integrity and connector condition before condemning the throttle body.

Do I need to reset or relearn the TPS after work?
Yes. After throttle body replacement or cleaning that affects plate position, perform a throttle/idle relearn. A scan-tool routine is preferred, some vehicles will relearn after key-on cycles and a warm idle, but confirming with a proper procedure saves hassles.