Standard Ignition TH389 throttle position sensor for the 1999-2004 Subaru Forester H4 2.5L and other vehicles monitors the throttle body valve position. It is designed specifically for high-mileage Subaru vehicles.
A rough idle, hesitation when you accelerate or a check engine light can mean the throttle position sensor is failing, though other faults can look the same. With the engine off, look over the plug and wiring for corrosion, damage or a loose fit before replacing the sensor; a shop can run the electrical tests. Each engine takes one sensor.
TH389 is a direct-fit replacement for the 1999-2004 Subaru Forester H4 2.5L and also works as a Subaru Outback throttle position sensor for the 2000-2004 H4 2.5L. It is tested and calibrated to match OE performance. If your Subaru is not named here, look up its year and engine in the "Vehicles it fits" section.
Fit and size
Build and materials
Product information is for general reference and may contain errors. See our Disclaimer.
Is this the right Subaru Forester throttle position sensor for a 1999-2004 H4 2.5L?
Yes. Standard Ignition TH389 fits the 1999-2004 Subaru Forester H4 2.5L. If your Subaru is not named on this page, check its year and engine in the "Vehicles it fits" section.
Will TH389 work as a Subaru Impreza throttle position sensor on a 1999-2005 H4 2.5L?
Yes. Standard Ignition TH389 fits the 1999-2005 Subaru Impreza H4 2.5L, and each engine takes one sensor.
What kind of connector does the TH389 throttle position sensor have?
The Standard Ignition TH389 throttle position sensor has one female plug-in connector with four male blade terminals.
What can a failing Standard Ignition TH389 throttle position sensor look like while driving?
A rough idle, hesitation on acceleration or a check engine light can be signs of a failing sensor. A shop can test it to confirm.
Is the Standard Ignition TH389 throttle position sensor calibrated to match OE performance?
Yes. This throttle position sensor is tested and calibrated to match OE performance, with throttle response, performance and fuel economy as the goals.
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WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
