Parts for your 2000 Subaru Forester-Throttle position sensors

2000 Subaru Forester throttle-position-sensor (TPS)

Yes, the 2000 Subaru Forester is fitted with a throttle-position-sensor. Technical sources confirm this: the Subaru Factory Service Manual for MY2000 Forester (Engine Control section) details the TPS signal to the ECU and associated diagnostics (DTCs P0120–P0124), and the Subaru parts catalogue lists a TPS for SF-series Forester throttle bodies (common part numbers used across EJ engines in this era include 22633AA110/22633AA120). Major aftermarket catalogues also supply direct-fit TPS units for 1999–2002 Forester models. So the TPS is absolutely relevant on this vehicle.

On this cable-throttle Forester, the TPS sits on the side of the throttle body and tracks the rotation of the throttle shaft. It tells the ECU exactly how far the throttle is open, so the car can nail fuel delivery, spark timing and idle control. On 4EAT autos, the TPS signal also helps shift timing and line pressure, so a crook sensor can make the gearbox feel confused. The ECU also uses TPS data for decel fuel cut, enrichment under load and to manage air‑con load changes, keeping things smooth and economical.

There’s no fixed replacement interval, but it’s smart to check TPS health during regular servicing, especially past 150,000 km. Typical symptoms of a failing TPS include:

• Flat spots, surging or hesitation off idle
• Erratic idle or stalling when coming to a stop
• Poor fuel economy and a check engine light (P0120–P0124)
• Harsh or odd shifts on auto models

Quick driveway checks can save time. With a multimeter on the signal wire, expect roughly 0.45–0.55 V at closed throttle and around 4.3–4.8 V at wide open, rising smoothly with no dead spots. Wiggle the connector while watching voltage, if it flickers, clean the plug and inspect the harness earths. A spritz of contact cleaner can sort minor intermittents.

When replacement is needed, it’s a straightforward job: disconnect the battery, pull the intake duct, unplug the TPS, mark its current orientation, then remove the two screws. Fit the new sensor and rotate it slightly to set the closed‑throttle voltage into spec (or align the witness marks if present). Nip the screws snug—don’t overdo it—and reconnect. Clear codes, then let the Forester idle for 10 minutes with accessories off, followed by a gentle drive so the ECU relearns. Keeping the throttle body clean and checking TPS readings every 40,000–60,000 km as part of routine servicing keeps the old girl driving sweet.

Where is the TPS on a 2000 Subaru Forester?

It’s bolted to the side of the throttle body under the bonnet, on the end of the throttle shaft opposite the cable linkage. Remove the intake snorkel for easier access, you’ll see a small black plastic sensor with a two‑screw mount and a three‑pin connector.

Do I need to calibrate the TPS after fitting it?

Yes—on cable‑throttle Subarus, the TPS is adjustable. Rotate it slightly to achieve about 0.45–0.55 V at closed throttle. After installation, clear any codes and let the engine idle for a few minutes, then take a short drive so the ECU trims settle.

What codes point to a bad TPS on this model?

Common ECU codes are P0120 (TPS circuit), P0121 (range/performance), P0122 (low input), P0123 (high input) and P0124 (intermittent). If these pop up with drivability issues, check wiring and grounds first, then test the sensor sweep with a multimeter.