Parts for your 2021 Mitsubishi Eclipse cross-Throttle position sensors

2021 Mitsubishi Eclipse Cross throttle position sensors

Yes, the 2021 Mitsubishi Eclipse Cross is fitted with throttle position sensors. Technical sources that confirm this include the Mitsubishi Motors Workshop Manual for Eclipse Cross (GK/GL, 2018–2021) Group 13A – Engine Electrical, which describes the electronic throttle body as having dual-track throttle position sensing, the factory DTC listings that include P0121–P0123 and P2135 for throttle/pedal position faults, and the Mitsubishi parts catalogue, which shows the throttle position sensor integrated into the throttle body assembly.

On this model, the throttle position sensors live inside the electronic throttle body and constantly report the throttle plate angle to the ECU. That signal is crucial for smooth take-off, tidy idle, clean gear changes on the CVT, cruise control accuracy, turbo boost management on the 1.5T, and keeping emissions gear happy. It’s a redundant, twin-signal setup so the ECU can cross-check the readings for safety. If the readings don’t agree, it’ll throw a fault code and may drop into limp mode to protect the engine and driveline.

Because the sensors are built into the unit, servicing focuses on keeping the throttle body clean and making sure the wiring and connectors are pristine. During routine servicing, it’s worth:

• Scanning for stored or pending codes (P0121–P0123, P2135, P2101, etc.) and checking live data for TPS A/B agreement and smooth percentage sweep.
• Inspecting the throttle body for carbon on the plate and bore, clean gently with throttle body cleaner, avoiding flooding the shaft area where the sensor seals are.
• Checking the harness for chafe, corrosion, or poor earths that can skew sensor readings.

If replacement is needed, the whole throttle body assembly is typically replaced rather than the sensor alone. Always fit a new gasket/O-ring, torque the bolts evenly, and perform a throttle/idle relearn. Mitsubishi specifies doing this with a capable scan tool (MUT-III or equivalent) to initialise the closed position and idle control. After battery disconnection or throttle body work, an adaptation procedure helps stabilise idle and throttle response. Most workshops allow around an hour for diagnosis and replacement, plus time for relearn.

Common signs of a crook throttle position sensor on an Eclipse Cross include hesitant acceleration, hunting idle, sudden loss of power, higher fuel use, and the check engine lamp. If those crop up, don’t keep driving it hard—get it scanned and sorted before it strands you or stresses the CVT.

Popular questions about 2021 Mitsubishi Eclipse Cross throttle position sensors

Does the 2021 Eclipse Cross have a separate, replaceable throttle position sensor?
It doesn’t. The throttle position sensors are sealed into the electronic throttle body as a paired (redundant) unit. If the sensor fails or the signals don’t correlate, the fix is to replace the throttle body assembly and carry out a relearn with a scan tool.

Can cleaning fix throttle position sensor problems?
Cleaning can help if the throttle plate is sticking or there’s heavy carbon causing odd airflow at idle. Use proper throttle body cleaner and avoid soaking the sensor area. If the ECU is flagging correlation or circuit faults (like P0121–P0123 or P2135), cleaning won’t repair a failed sensor—replacement is the go.

Do I need a relearn after battery disconnection or throttle body replacement?
Yes. The ECU needs to relearn the throttle’s closed position and idle control. A professional scan tool can run the throttle valve initialisation quickly. Without the procedure, the car may idle rough or flare until it adapts, and in some cases it won’t stabilise properly.