Parts for your 2007 Subaru Impreza-Throttle position sensors

2007 Subaru Impreza throttle position sensor (TPS) — what it does and how to look after it

Based on technical references including the Subaru Factory Service Manual for the 2007 Impreza (Engine Diagnostics), the OEM parts catalogue, and standard OBD‑II fault listings used by service data providers, a throttle position sensor is indeed fitted and relevant on the 2007 Subaru Impreza. Both cable‑throttle variants and drive‑by‑wire (electronic throttle control) variants use TPS feedback: cable models have a bolt‑on TPS at the throttle shaft, while drive‑by‑wire units integrate dual TPS sensors within the throttle body assembly alongside the throttle motor. Related diagnostic codes such as P0120–P0124 and P2135 are specified for this model year, confirming TPS presence and monitoring.

On a 2007 Impreza, the TPS tells the engine control unit exactly how far the throttle plate is open. That live signal helps the ECU manage fuel, ignition timing, idle speed control, and transmission shift strategy where applicable. When the signal is clean and accurate, the car feels crisp off the line, idles smoothly, and uses petrol efficiently. If the signal is noisy or inconsistent, owners may notice a check engine light, surging or hesitation, rough idle, higher fuel use, or limp‑home behaviour on drive‑by‑wire cars.

As part of routine servicing, the TPS isn’t a scheduled replacement item, but it benefits from attention. Sensible care includes:

• Inspecting the throttle body and intake ducting for oil vapour gunk and cleaning the throttle plate with electronics‑safe throttle cleaner. Avoid flooding the motor housing on drive‑by‑wire units.
• Checking the TPS/throttle body connector for corrosion, bent pins, or a loose fit, ensure good earths and stable battery voltage.
• Scanning live data to confirm smooth throttle angle change with no dropouts, and clearing any stored TPS‑related DTCs after confirmed repairs.

Replacement advice depends on configuration. On cable‑throttle cars, the TPS can usually be replaced separately and, where slotted, adjusted so closed‑throttle voltage/angle matches spec via a scan tool. On drive‑by‑wire cars, the TPS is part of the throttle body, replacement typically means swapping the complete assembly. After refit, perform an idle/throttle relearn with a scan tool or the prescribed key‑on procedure from the service manual. Always use quality parts, fit a fresh throttle body gasket if removed, and avoid forcing the throttle plate by hand on electronic units. A quick road test and another live‑data check help verify the fix. Many workshops roll this into 100,000–120,000 km tune‑up inspections, or sooner if symptoms or DTCs appear.

• Does a 2007 Subaru Impreza have a throttle position sensor?
  Yes. All 2007 Impreza variants monitor throttle position. Cable‑throttle models use a bolt‑on TPS, while drive‑by‑wire versions have the TPS integrated into the electronic throttle body alongside the motor. If there’s no throttle cable at the throttle body, it’s drive‑by‑wire.
• What are common TPS failure symptoms on a 2007 Impreza?
  Typical signs include a check engine light, flat spots or hesitation on take‑off, rough or unstable idle, erratic revs, poor fuel economy, and, on electronic throttle cars, occasional limp‑home mode. Scan for codes like P0120–P0124 or P2135 to confirm.
• Is programming or calibration needed after TPS/throttle body replacement?
  Cable‑throttle TPS units may require a small adjustment so the ECU sees the correct closed‑throttle angle, a scan tool makes this straightforward. Electronic throttle bodies generally need an idle/throttle relearn after installation. Many scan tools can trigger this, otherwise follow the factory procedure.