Parts for your 2007 Subaru Forester-Throttle position sensors

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

Technical sources confirm the 2007 Subaru Forester does use a throttle position sensor. The Subaru Factory Service Manual for MY2007 Forester (Engine Diagnostics and Wiring System) specifies ECM monitoring of a “throttle sensor,” with diagnostic trouble codes P0120–P0123 dedicated to the TPS circuit. The official wiring diagrams show a throttle sensor signal path on both cable-throttle and electronic throttle control variants, and Subaru’s parts listings for MY2007 Forester include either a standalone TPS (on cable-throttle models) or an integrated throttle sensor within the electronic throttle body assembly (on drive‑by‑wire models). So yes—this model relies on a TPS.

On a 2007 Forester, the TPS tells the engine computer exactly how far the throttle is opened. That info is blended with airflow, crank and cam signals to sort fuelling, timing, idle speed, and auto trans shift strategy. When it’s healthy, throttle response feels crisp, fuel economy stays on track, and the idle is steady. When it’s off, the car can feel doughy, surge, or throw a check engine light.

As part of routine servicing, it’s worth giving the throttle body area a quick once-over. For cable-throttle cars, the TPS is a small sensor on the side of the throttle shaft, for electronic-throttle cars, it’s built into the throttle body alongside the motor and isn’t separately serviceable. Either way, keep the connector clean and secure, and avoid blasting harsh cleaners into the sensor itself.

• Common symptoms of a crook TPS: hesitant take-off, flat spots, hunting idle, poor fuel use, and fault codes like P0120–P0123, on drive‑by‑wire, you might also see P2135 correlation faults.
• Simple care tips: clean the throttle plate and bore with throttle-body cleaner, inspect the loom for chafing, and check the earths.
• Adjustment/relearn: cable-throttle TPS units may need alignment to the spec shown in the Subaru manual after replacement. Electronic-throttle cars usually need a throttle/idle relearn using Subaru Select Monitor (or a capable scan tool) after fitting a throttle body.
• Parts choice: stick with genuine or high-quality aftermarket sensors, cheapies can cause erratic signals.

Replacement isn’t a routine interval job—do it when diagnostics point to the TPS. On cable-throttle models, it’s typically a short job with basic hand tools, followed by a scan-tool check to confirm the closed/throttle-angle readings are within spec. On electronic-throttle models, replacement generally means swapping the complete throttle body and then performing the proper learning procedure. If in doubt, a workshop with Subaru gear can diagnose and set it up quickly, saving guesswork and keeping the Forester running sweet as.

Popular questions about 2007 Subaru Forester TPS

Does my 2007 Forester have a separate TPS or is it built into the throttle body?
It depends on variant and market. Cable-throttle models use a separate, replaceable TPS on the throttle shaft. Drive‑by‑wire models have the sensor integrated into the electronic throttle body along with the motor. A quick visual check helps: if there’s a physical throttle cable at the body, it’s likely a separate TPS, no cable usually means an integrated unit.

What fault codes point to a TPS problem on this model?
The big ones are P0120–P0123 (TPS circuit range/performance, high, or low). Drive‑by‑wire cars can also log P2135 (throttle/pedal correlation). These may come with symptoms like surging, poor throttle response, or an erratic idle. Always confirm with live data—look for smooth, linear throttle-angle change with no dropouts.

Can I just clean the TPS, or does it need replacing?
The sensor itself isn’t serviceable. Cleaning the throttle plate and bore can help drivability, but if the sensor signal is noisy or out of range, replacement is the fix. After replacement, perform the correct adjustment (cable-throttle) or run a throttle/idle relearn with a capable scan tool (drive‑by‑wire) so the ECU knows the new closed and open positions.