Parts for your 2006 Subaru Impreza-Throttle position sensors

2006 Subaru Impreza throttle position sensor (TPS)

Yes, the 2006 Subaru Impreza uses a throttle position sensor. Factory sources including the 2006 Subaru Impreza Factory Service Manual (engine management diagnostics), Subaru Technical Information System, and OEM parts catalogues confirm throttle position sensing is fitted across the range. Cable-throttle variants use a standalone TPS on the throttle body, while drive-by-wire models (common on 2006 WRX/STI and many 2.5i trims) have a TPS integrated into the electronic throttle body, alongside an accelerator pedal position (APP) sensor for pedal input.

On this model, the TPS tells the engine control module exactly how far the throttle is open, so the ECU can sort fuelling, ignition timing and transmission behaviour. If that signal goes flaky, the Impreza can idle rough, hesitate off the mark, surge at cruise, or light the MIL with codes like P0121–P0123 or, on drive-by-wire cars, correlation faults such as P2135/P2138.

Servicing approach depends on which setup the vehicle has:

• Cable-throttle: the TPS is a separate, adjustable sensor on the throttle body. During replacement, the sensor is positioned and set so the closed-throttle voltage is within spec (typically around 0.5 V, verified on a scan tool). A light hand on the screws and a recheck of idle speed and throttle angle in live data keeps it sweet.
• Drive-by-wire: the TPS is built into the electronic throttle body. If the sensor fails, the usual fix is replacing the throttle body assembly. After fitting, perform an idle/throttle relearn with a capable scan tool. The APP at the pedal is separate, faults there need their own diagnosis.

Good maintenance goes a long way. Keep the throttle bore clean (use proper throttle-body cleaner, not carby spray on coated plates), inspect the connector for green crusties, and confirm the 5 V reference and ground are stable if chasing an intermittent fault. Before throwing parts at it, look at live data: the throttle position should sweep smoothly from about 0–100% with no jumps. If it’s jumpy, it’s likely time for replacement.

For Aussie and Kiwi owners, it’s worth using quality OEM or reputable brand sensors. After any TPS or throttle-body work, clear codes, do an idle relearn, and take it for a gentle drive so the ECU can re-adapt. That’ll keep the 2006 Impreza running crisp and drama-free.

Does the 2006 Subaru Impreza have a throttle position sensor?

It does. Cable-throttle versions use a standalone TPS on the throttle body. Drive-by-wire models have a TPS built into the electronic throttle body and also use an accelerator pedal position sensor. This setup is detailed in Subaru’s 2006 factory service documentation and OEM parts listings for the model range.

What are the signs the TPS is failing on a 2006 Impreza?

Common clues include erratic idle, flat spots on take-off, sudden surging, and the check engine light. Scan-tool data will often show a throttle signal that doesn’t ramp smoothly, and you may see DTCs like P0121–P0123 or, on DBW cars, correlation codes. Always check wiring and throttle-body cleanliness before replacement.

Can the TPS be adjusted or cleaned, or does it need replacing?

On cable-throttle cars, the TPS can be adjusted and replaced on its own. On drive-by-wire models, the TPS is integrated into the throttle body, so replacement typically means swapping the whole throttle body. Cleaning helps sticky throttles but won’t fix a failed sensor, follow up with an idle/throttle relearn.