Parts for your 2020 Mazda Cx-5-Throttle position sensors

2020 Mazda CX-5 throttle-position-sensors: what they do and how to look after them

Technical documentation confirms the 2020 Mazda CX-5 absolutely uses throttle-position-sensors. The Mazda CX-5 (KF) Workshop Manual for the SKYACTIV-G and SKYACTIV-D engines describes an electronic throttle body that contains two throttle valve position sensors (Sensor 1 and Sensor 2) alongside the throttle actuator motor. Mazda’s wiring diagrams show these dual sensors integrated in the throttle body, and the official diagnostic list includes TPS-related fault codes (such as P0121, P0122, P0123 and P2135), all of which revolve around throttle position signal performance and correlation. These factory sources make it clear the TPS is present and monitored, but packaged within the throttle body rather than as a separate bolt-on sender.

On the 2020 Mazda CX-5, the throttle-position-sensors tell the engine control module exactly where the throttle plate sits. Because it’s a drive-by-wire setup, the computer compares the accelerator pedal position with the throttle plate position and constantly adjusts the throttle motor to deliver smooth torque, tidy idle control and safe redundancy. That’s why there are two sensors inside the throttle body—if one reading goes walkabout, the other keeps things honest and the ECU can drop into a protective mode if needed.

They’re not a routine service item, but a crook TPS can show up as a hesitant take-off, rough idle, surging, poor fuel economy, a check-engine light, or a limp-home condition. Before throwing parts at it, a proper scan with live data helps heaps: look at Throttle Position Sensor 1 and 2, confirm they track cleanly and agree with the accelerator pedal sensors. Also check connectors and wiring for moisture or damage.

Because the TPS is sealed inside the throttle body, replacement usually means swapping the whole assembly. Best practice when replacing includes fitting a new gasket, tightening to spec, clearing codes and performing throttle/idle learning with a scan tool so the ECU knows the new home position. A short road test to verify stable idle and smooth tip-in is worth its weight in gold.

Maintenance-wise, keep the air filter fresh and the intake tract clean. Throttle body cleaning can help if there’s carbon at the plate, but don’t force the blade by hand. Use the correct cleaner, avoid soaking electronics, and follow with an idle relearn if required. For most CX-5 owners, a quick inspection of the connector and wiring at service time is all that’s needed to keep the TPS happy for many kilometres.

• Common signs: erratic idle, hesitation, poor economy, MIL on, limp mode
• Checks: scan live data (TP1/TP2), wiring/connector condition, correlation with pedal
• Service tip: replace throttle body as an assembly, perform throttle/idle learn

FAQs

Does the 2020 Mazda CX-5 have a separate throttle-position-sensor?
The TPS is present but integrated into the electronic throttle body along with the actuator motor. It isn’t serviced as a stand-alone sensor—if it fails, the throttle body assembly is typically replaced.

What symptoms point to a failing TPS on a CX-5?
Rough or high idle, hesitation, surge on light throttle, poor fuel economy, a check-engine light and sometimes limp-home mode. Scan tool data showing disagreement between Throttle Position Sensors 1 and 2 or correlation faults is a strong clue.

Can cleaning fix TPS issues, or is replacement needed?
Cleaning helps if build-up on the throttle plate is causing sticky movement or airflow issues, but it won’t repair a faulty internal sensor. If diagnostics show bad TPS signals, expect to replace the throttle body and carry out a throttle/idle relearn.