Parts for your 2019 Mazda Cx-5-Throttle position sensors

2019 Mazda CX-5 throttle position sensors

Short answer: yes, the 2019 Mazda CX‑5 uses throttle position sensors. Mazda’s KF‑series workshop documentation for the CX‑5 (2017–2021) describes an electronic throttle body that contains dual throttle position sensors (often referred to as TPS1 and TPS2) providing redundant feedback of throttle plate angle to the PCM. The accelerator pedal also has its own dual‑track position sensor. Mazda wiring diagrams and the factory DTC list (including codes such as P0121, P0122, P0123, P2135) corroborate that the PCM actively monitors throttle position sensor signals. Diesel variants use an electronically controlled intake throttle/shutter with position feedback as well. These are all hallmarks of a drive‑by‑wire system that depends on TPS for safe, accurate control.

On a 2019 CX‑5, the throttle position sensors tell the engine computer exactly where the throttle plate sits at any moment. That info lets the ECU fine‑tune fuel, ignition timing, idle control and, on the 2.5T, torque delivery under boost. It also ties into cruise control, stability and traction systems, and the auto transmission’s shift strategy. Because it’s drive‑by‑wire, the TPS works alongside the accelerator pedal sensor, the ECU constantly checks they agree, and if they don’t, it’ll drop into limp mode to keep things safe.

There’s no scheduled replacement interval for the TPS on this Mazda. It’s sealed into the throttle body on petrol models, so if the sensor fails, the usual fix is to replace the whole throttle body assembly. During regular servicing, a few simple habits help: keep the air filter fresh, avoid over‑oiling aftermarket filters, and don’t blast cleaner into the throttle body’s electronics. If cleaning carbon from the throttle bore, use a suitable throttle cleaner sparingly, engine off, and avoid levering the plate. Let a scan tool perform the throttle/idle relearn afterwards if required.

Common signs of TPS trouble include erratic idle, hesitation, stalling, sudden loss of power, or the MIL lighting up with codes like P0121/P0122/P0123/P2135. Before replacing parts, a tech will typically check live data for TPS1/TPS2 agreement, inspect the connector and wiring for corrosion or rub‑through, and verify good battery voltage. If a new throttle body is fitted, a new gasket is recommended, bolts are torqued to spec, and an electronic relearn is run so the ECU knows the new plate’s home and range. Sorted properly, the CX‑5’s TPS is a fit‑and‑forget item that keeps the drive smooth and drama‑free.

• Symptoms to watch: rough or high idle, surging, limp mode, poor fuel economy, MIL on
• Good practices: gentle throttle body cleaning, protect connectors, perform throttle relearn
• When to replace: confirmed TPS correlation faults or non‑recoverable sensor failure

Does the 2019 CX‑5 have a traditional cable throttle?

No. It’s fully drive‑by‑wire. The accelerator pedal has position sensors, and the throttle body uses dual throttle position sensors for feedback to the ECU. There’s no cable to adjust, and any throttle calibration is handled electronically via relearn procedures.

Can the throttle position sensor be cleaned instead of replaced?

The TPS itself is sealed and not serviceable. Light cleaning of the throttle bore can help sticky idle or carbon build‑up, but avoid flooding the electronics. If the ECU flags TPS correlation faults after checks, the fix is typically a new throttle body assembly and a relearn.

What fault codes point to TPS issues on a 2019 CX‑5?

Common ones include P0121 (TPS range/performance), P0122/P0123 (low/high input), P2135 (TPS/APP correlation) and related throttle actuator codes. A proper scan with live data will confirm whether TPS1 and TPS2 disagree, or if the issue is wiring, power, ground, or the actuator itself.