Parts for your 2012 Mazda Premacy-Throttle position sensors

2012 Mazda Premacy throttle-position-sensors (TPS)

Based on technical references including the Mazda Workshop Manual for the Mazda5/Premacy CW (2010–2015), the Mazda Electronic Parts Catalogue, and the model’s OBD-II DTC listings, the 2012 Mazda Premacy uses electronic throttle control with dual throttle-position-sensors built into the throttle body, plus an accelerator pedal position sensor at the pedal. Diagnostic sections for this model list TPS-related faults such as P0120–P0124 and P2135, confirming the TPS is a relevant, fitted component rather than a cable-era add-on.

The TPS on a 2012 Premacy tells the engine computer exactly how far the throttle plate is open, so fuelling, ignition timing, transmission shift strategy, cruise control and stability systems all stay on song. In this generation it’s an integrated, dual-channel sensor for redundancy and safety, living inside the throttle body. It works hand-in-hand with the accelerator pedal position sensor, cross-checking inputs to keep the throttle silky and predictable.

There’s no scheduled replacement interval for the TPS, but as the kilometres climb, owners might notice rough idle, hesitant take-off, rev hang, sudden limp-home, or the MIL light on. Typical TPS-related codes include P0121, P0122, P0123 and P2135. Before throwing parts at it, it’s worth checking the air intake for leaks, making sure the connector is clean and firmly seated, and inspecting the harness for chafing near the throttle body.

When the sensor fails, it’s generally replaced with the throttle body assembly because the TPS isn’t designed to be serviced on its own. A technician will remove the intake duct, unplug the connector, swap the throttle body (with a new gasket), and torque the fasteners correctly. After refit, an idle/throttle relearn is required, the reliable method is with a scan tool to perform the throttle/idle adaptation so it settles into a smooth idle. Avoid forcing the throttle plate by hand—it can damage the gearset or upset the calibration. If deposits are the main issue, a careful clean with throttle-body-safe cleaner (electronics kept dry, no soaking) can restore response. Keeping the air filter fresh and the intake sealed helps prevent future contamination.

For routine servicing, a quick visual once-over of the throttle body and connector, checking for stored TPS codes, and monitoring live data during a road test will flag problems early. If replacement is needed, genuine-spec parts and a proper relearn will keep the Premacy feeling factory-fresh.

• Common symptoms: erratic idle, stumble on tip-in, poor fuel economy, limp mode, MIL on
• Common codes: P0121, P0122, P0123, P0124, P2135

FAQs

Does the 2012 Mazda Premacy have a separate TPS or is it part of the throttle body?
The TPS is integrated into the electronic throttle body and uses dual tracks for redundancy. The accelerator pedal has its own sensor too, but the classic standalone TPS isn’t used on this model. If the TPS fails, the usual repair is replacing the throttle body assembly, then performing a throttle/idle relearn.

What are the signs of a failing TPS on a 2012 Premacy?
Owners often notice a rough or high idle, flat spots on light throttle, hunting revs, or sudden limp-home. The check engine light may appear with codes like P0121 or P2135. Before replacing parts, check for intake leaks, a dirty throttle plate, or a loose/corroded connector.

Do TPS or throttle body replacements need calibration?
Yes. After replacing or thoroughly cleaning the throttle body, an adaptation or idle relearn should be carried out. A scan tool method is the most reliable. This lets the ECU relearn throttle plate positions so idle and tip-in feel normal again.