Parts for your 2015 Mitsubishi Asx-Throttle position sensors

2015 Mitsubishi ASX throttle-position-sensor (TPS): what it is, how it works, and when to service it

Technical sources confirm the 2015 Mitsubishi ASX uses an electronic throttle control (drive‑by‑wire) throttle body that contains an internal, dual‑track throttle position sensor. It isn’t a separate, serviceable sensor on a cable‑throttle—it's integrated into the throttle body assembly. This setup is detailed in the Mitsubishi Motors Workshop Manual for ASX/RVR/Outlander Sport (Electronic Throttle Control System), reinforced by Mitsubishi’s electronic parts catalog (ASA), and reflected in factory diagnostics that list TPS‑related DTCs (such as P0121–P0123, P2135) for this model.

On this ASX, the TPS tells the engine ECU exactly how far the throttle plate is open. Working alongside the accelerator pedal position sensor and the throttle actuator motor, it lets the ECU manage air intake with precision. That means smoother idle, cleaner shifts, better fuel economy, and proper emissions control. If the ECU can’t trust the TPS signal, it may drop the vehicle into limp mode to protect the engine and catalyst.

Owners should treat the TPS as part of the throttle body. If the sensor tracks go out of spec, you replace the throttle body assembly rather than the sensor alone. Common warning signs include erratic idle, hesitation, surging, poor fuel economy, stalling, or the MIL on with codes like P0121–P0123 or P2135. Before condemning the unit, check the wiring and connector at the throttle body—heat and moisture at the front of the bay can cause intermittent faults.

Good servicing practice for a 2015 ASX includes periodic throttle body inspection and cleaning, especially if idle quality isn’t flash or fuel use creeps up. Remove the intake duct, use a throttle‑body‑safe cleaner, and avoid drowning the shaft area. Replace the throttle body gasket if it’s damaged. After cleaning or replacement, perform a throttle/idle relearn—ideally with a scan tool (MUT‑III or equivalent). A basic manual relearn many techs use: battery reconnected, key ON for 30 seconds, start and let it idle with all loads off until warm, then hold a stable idle for several minutes. If the throttle body has been replaced, a proper adaptation with a scan tool is the safest bet.

For diesels and petrol variants alike, the principle is the same: the throttle body houses the TPS, and reliable position feedback is critical to drivability.

• Mitsubishi Motors Workshop Manual (ASX/RVR/Outlander Sport, Electronic Throttle Control System, 2010–2016)
• Mitsubishi ASA Electronic Parts Catalogue (throttle body assembly with integrated sensor)
• OBD‑II diagnostics references for DTCs P0121–P0123, P2135 applicable to 2015 ASX

Popular questions about 2015 Mitsubishi ASX throttle-position-sensors

Does the 2015 ASX have a separate TPS I can replace?
No. It uses a drive‑by‑wire throttle body with the TPS built in. If the TPS fails, the fix is typically replacing the throttle body assembly and then performing a throttle/idle relearn.

What are the common signs the TPS is playing up on a 2015 ASX?
Look for a check‑engine light, limp mode, rough or high idle, hesitation off the line, surging, or worse fuel economy. Scan for codes like P0121–P0123 or P2135, and don’t forget to check the connector and wiring before replacing parts.

Do I need a relearn after cleaning or replacing the throttle body?
Yes. After cleaning, a basic idle relearn may be enough, after replacement, use a scan tool to run the throttle/idle adaptation so the ECU knows the new throttle plate positions. That keeps idle stable and throttle response crisp.