Parts for your 2011 Mazda Axela-Throttle position sensors

2011 Mazda Axela throttle position sensor: what it is, why it matters, and how to look after it

Based on the Mazda BL (2009–2013) Workshop Manual and Mazda Global Service Support (MGSS) documentation for the Electronic Throttle Control System, the 2011 Mazda Axela (Mazda3 BL series) is fitted with throttle position sensors. They’re integrated into the electronic throttle body and work alongside the accelerator pedal position sensor. The factory DTC set for this model explicitly covers throttle position circuits and correlation faults (e.g., P0121, P0122, P0221, P2135), which confirms the TPS is present and monitored by the PCM. So yes—throttle-position-sensors are relevant to the 2011 Mazda Axela.

On this model, the throttle position sensor’s job is to tell the engine computer exactly where the throttle plate is at any moment. Rather than a cable, the Axela uses drive-by-wire: the pedal sends its request, the PCM commands a little motor in the throttle body, and the built-in TPS pair reports the plate angle back for accuracy and safety. That feedback helps the car nail smooth take-offs, steady idle, cruise control behaviour, fuel economy, and emissions.

There’s no routine replacement interval for the TPS, because it’s moulded into the throttle body. As part of regular servicing, a technician will usually:

• Scan for pending or stored TPS-related fault codes and check live data for smooth, matching angles from Sensor 1 and Sensor 2.
• Inspect the throttle body connector and loom for moisture, corrosion, or chafing—common causes of intermittent faults.
• Clean light carbon from the throttle bore using sensor-safe throttle cleaner without forcing the blade open by hand.

If the car shows symptoms like erratic idle, hesitation, sudden limp mode, or a glowing MIL alongside DSC/traction lights—and codes such as P0121 or P2135 keep returning—replacement of the throttle body assembly is typically the fix. The TPS isn’t serviced separately on most BL-series Axelas. Fit a quality OEM-equivalent throttle body with a new gasket, follow workshop torque specs, and perform an idle/throttle relearn using a scan tool where possible. If a scan tool’s not handy, a basic relearn after battery disconnect can help: warm the engine fully, let it idle with all accessories off for a few minutes, then idle with A/C on, and take a short steady drive so the PCM trims itself.

A couple of extra tips for Aussie and Kiwi conditions: keep the battery and grounds in top nick (low voltage can upset drive-by-wire), avoid blasting harsh cleaners into the intake, and don’t pry the blade—let the motor move it. Treat it right and the Axela’s TPS setup will go the distance, kilometre after kilometre.

Popular questions

Does a 2011 Mazda Axela actually have a throttle position sensor?
Yes. Technical literature for the BL-series Mazda3/Axela shows an electronic throttle body with dual internal throttle position sensors used for redundancy and accuracy. Relevant OBD-II fault codes (like P0121 and P2135) also reference those sensors directly.

Can the TPS be replaced on its own, or do you need a whole throttle body?
For most 2011 Axela variants, the TPS is integrated and not sold separately. The reliable repair is to replace the throttle body assembly, then carry out the proper relearn so the PCM knows the new throttle’s baseline.

How do you reset or relearn the throttle after cleaning or a battery change?
The best way is with a scan tool procedure for throttle/idle learn. If that’s not available, warm the engine, idle a few minutes with accessories off, then with A/C on, and complete a gentle drive cycle. This helps the PCM settle its idle and throttle control maps.