Parts for your 2013 Subaru Outback-Throttle position sensors

2013 Subaru Outback throttle position sensor (TPS)

Yes, the 2013 Subaru Outback uses a throttle position sensor. Technical sources, including the Subaru Factory Service Manual for BR/BM Outback/Legacy models and Subaru’s OEM parts catalogue, specify an electronic throttle body that integrates dual throttle position sensors and a drive-by-wire motor. The engine control module monitors these TPS circuits and sets related DTCs (e.g., P0121, P0122, P0123, P0221, P2135) when faults are detected, confirming the TPS is fitted and relevant on this model.

On the 2013 Outback, the TPS lives inside the electronic throttle body and reports the throttle plate angle to the ECU. That data is used to juggle fuel, ignition timing, idle speed, cruise control and stability systems, and to keep the CVT behaving smoothly. Subaru builds in two position signals for redundancy, so the ECU can cross-check them for safety. Because it’s integral, the TPS isn’t a stand-alone part—if it fails, the whole throttle body assembly is replaced.

There’s no scheduled TPS replacement interval, but keeping the throttle body clean goes a long way. Use a proper throttle body cleaner, avoid soaking the shaft area, and don’t force the plate open by hand. Inspect the connector for corrosion, make sure the intake ducting is airtight after service, and maintain a healthy battery—low system voltage can make the ECU unhappy and trigger correlation codes. Don’t adjust the throttle stop screw, it’s factory-set.

Typical hints the TPS/throttle body needs attention include a shaky idle, hesitation, surging, poor fuel economy, cruise control dropping out, and a check engine light—sometimes with limp-home behaviour. If replacement is needed, fit a quality throttle body (with a new gasket), tighten evenly, and perform a throttle/idle relearn using a scan tool. Many workshops will also run an ECU throttle initialisation after cleaning to settle the idle. Keep in mind the accelerator pedal has its own position sensor, so diagnosis should confirm whether the fault is at the pedal, in the wiring, or inside the throttle body before parts are swapped.

• Common TPS-related codes: P0121, P0122, P0123, P0221, P2135
• Best practice: clean carefully, check wiring, relearn throttle after service
• Part note: TPS is integrated, replacement is the entire throttle body

Does the 2013 Outback have a separate TPS I can replace on its own?

No. On this model the TPS is integrated into the electronic throttle body along with the throttle motor. If the sensor fails, the fix is to replace the throttle body assembly as a unit. Part numbers differ between the 2.5-litre FB25 and the 3.6-litre EZ36, so matching by VIN is the safest bet.

Do I need a relearn after cleaning or replacing the throttle body?

Yes, it’s best practice. A scan tool can run the throttle/idle relearn or “throttle initialisation” so the ECU knows the exact closed and open positions. Without it, idle can be high or unstable. After relearn, let the engine idle undisturbed until warm, this helps stabilise fuel trims.

What fault codes point to a TPS issue on a 2013 Outback?

Codes like P0121/P0122/P0123 (throttle position range/performance, low, high), P0221, and P2135 (throttle/pedal correlation) are typical. Keep in mind correlation faults can also come from wiring problems, a weak battery, or an accelerator pedal position sensor issue—so test before replacing parts.