Throttle Position (TP) Sensor

1998 Subaru Forester L, StandardSECTION Throttle Position (TP) Sensor
NOTE: All testing procedures are performed with engine at normal operating temperature. For further TP sensor diagnosis, see TESTS W/CODES article in this section.

Connect scan tool. Turn ignition on. With throttle fully closed, observe TP sensor voltage and throttle opening angle. TP sensor voltage should be 0.45-0.55 volt at 0.0 percent throttle angle. If necessary, loosen retaining screws and rotate TP sensor until correct voltages are obtained. Replace TP sensor if voltage cannot be adjusted to specification.

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.