Parts for your 2006 Mazda 3-Throttle position sensors

2006 Mazda 3 throttle position sensor: what it does and how to look after it

Technical documentation shows the 2006 Mazda 3 absolutely uses a throttle position sensor. The Mazda3 (BK series) service manual details an electronic throttle body with dual TPS tracks built into the housing, paired with an accelerator pedal position (APP) sensor. Autodata/AllData listings for the same model include TPS-related DTCs (P0121–P0123), and Mazda parts catalogues note the TPS is non-serviceable and integrated with the throttle body. So yes—on a 2006 Mazda 3, the TPS is relevant and fitted as part of the electronic throttle control system.

On this model, the throttle position sensors sit inside the throttle body and report the exact angle of the throttle plate to the PCM. That lets the car manage idle, throttle response and emissions cleanly, matching requests from the pedal sensor with what the throttle plate’s actually doing. Because it’s a dual-track design, the PCM can compare the two signals for safety and chuck a fault if they don’t agree.

Typical signs the TPS/throttle body is unhappy include uneven idle, flat spots on acceleration, cruise control dropping out, a flashing or steady check engine light, and sometimes limp-home. Common codes are P0121, P0122, P0123 and correlation faults with the APP sensor.

• Service tips: keep the throttle body clean, but don’t drown the electronic side. Use proper throttle body cleaner and a soft cloth, avoid spraying directly into the motor/sensor area or submerging it.
• Never force the throttle plate by hand with the key on—it can damage the drive gears or upset the learn values.
• If the gasket’s disturbed, replace it to prevent unmetered air leaks that mimic TPS issues.
• After cleaning or battery disconnection, perform a throttle/idle relearn. Many scan tools support ETC reset, otherwise, a warm idle period with accessories off can let the PCM relearn.

If the TPS fails, it’s part of the throttle body assembly, so the practical fix is to replace the complete unit. After refit, a relearn procedure is recommended and clearing codes is a must. Using quality parts and following workshop-manual torque specs and procedures will keep the 2006 Mazda 3’s throttle response crisp and drama-free.

Popular questions

1) What are the symptoms of a bad TPS on a 2006 Mazda 3?
Owners usually notice erratic idle, hesitation, a dead spot when taking off, poor fuel economy, and the check engine light. The car can also go into limp mode. Scan tools often show codes like P0121–P0123 or correlation faults with the accelerator pedal sensor.

2) Can just the TPS be replaced, or does the whole throttle body have to go?
On this model the TPS is built into the throttle body and isn’t serviced separately. If testing confirms a TPS fault, the sensible repair is a complete throttle body replacement, followed by an idle/throttle relearn.

3) Does the TPS need calibration after cleaning or battery disconnection?
A relearn is recommended. Many workshops use a scan tool to command an ETC/throttle relearn. Without a scan tool, letting the engine idle at operating temperature with accessories off for several minutes often allows the PCM to relearn positions.