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Parts for your 2013 Mazda Cx-9-Throttle position sensors
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2013 Mazda CX‑9 Throttle Position Sensor (TPS) — What It Does and How To Look After It
Yes, the 2013 Mazda CX‑9 uses a throttle position sensor. Technical sources that confirm this include the Mazda Workshop Manual for the CX‑9 (Engine Control/ Fuel & Emissions sections), which describes an electronic throttle body with dual throttle position sensors feeding the PCM, and the Mazda engine wiring diagrams that show two TP sensor signal circuits. The Mazda genuine parts catalogue also lists the throttle body as an assembly “with sensor”, meaning the TPS is integrated and not serviced separately.
On the 2013 CX‑9, the TPS lives inside the electronic throttle body and constantly reports how far the throttle plate is open. The PCM uses that info alongside the accelerator pedal position sensors to manage air, fuel and spark. That’s how the CX‑9 maintains smooth idle, crisp throttle response and reasonable fuel economy, while keeping emissions in check. Because it’s a drive‑by‑wire setup, there are usually two TPS signals for redundancy and safety.
As part of routine servicing, it’s smart to keep the throttle body clean and make sure the TPS is behaving. While there’s no fixed replacement interval, checking operation around major services (say every 60,000–100,000 km) helps head off dramas. Common signs of TPS or throttle body issues include:
- Hesitation, surging, or a flat spot on take‑off
- Rough idle or stalling when coming to a stop
- Higher fuel use and a gutless feel
- Check Engine Light with codes like P0121, P0221, P2101, P2135
- Limp‑home mode or limited throttle response
Good practice during a service:
- Inspect the intake tract and air filter – a dirty filter can foul the throttle quickly.
- Clean the throttle body bore gently with throttle‑body‑safe cleaner and a lint‑free cloth. Don’t force the throttle plate by hand.
- Check for oil vapour build‑up from the PCV system and address any excessive blow‑by.
- Scan live data to verify stable throttle angle signals and match between the two TP sensors.
- After battery disconnection or throttle body replacement, perform the idle/throttle relearn with a scan tool or the specified key‑on procedure so the PCM relearns the stop positions.
If the TPS is faulty on a 2013 CX‑9, the fix is to replace the throttle body assembly (the sensor isn’t separate). Fit a new gasket, torque fasteners to spec, clear codes and complete the relearn. A quick post‑service road test confirming smooth tip‑in and steady idle is the final check. Keeping on top of this saves fuel, keeps the V6 feeling lively, and avoids inconvenient limp‑mode moments around town.
Popular questions
Does the 2013 Mazda CX‑9 have a throttle position sensor?
It does. The CX‑9’s electronic throttle body contains dual TPS elements that report throttle plate angle to the PCM. It’s part of the drive‑by‑wire system and isn’t a separate, bolt‑on sensor.
What are the symptoms of a failing TPS on a CX‑9?
Drivers may notice hesitation, uneven idle, poor fuel economy, or the vehicle dropping into limp mode. The Check Engine Light often appears with codes like P0121 or P2135. A scan of live data helps confirm erratic throttle angle readings.
Can the TPS be replaced separately on a 2013 CX‑9?
No. On this model the TPS is integrated into the throttle body. If the sensor fails, the recommended repair is to replace the complete throttle body, fit a new gasket and carry out a throttle/idle relearn.
