Parts for your 2023 Mitsubishi Asx-Temperature sensors

2023 Mitsubishi ASX temperature sensors — what they do and how to look after them

Temperature sensors are absolutely fitted to the 2023 Mitsubishi ASX. Technical sources such as the Mitsubishi Motors Service Manual (Engine/ECM, CVT, and HVAC sections for 2023MY ASX/RVR/Outlander Sport) and the Mitsubishi ASA electronic parts catalogue show multiple temperature sensors on this model. These include the engine coolant temperature (ECT) sensor, intake air temperature (IAT) sensor, CVT fluid temperature sensor (integrated in the transmission control assembly), ambient air temperature sensor (front bumper/grille area), and the evaporator temperature sensor inside the HVAC unit.

Each of these plays a different role. The ECT tells the engine computer how hot the engine is so it can manage fuel, ignition timing, cooling fans, and the dash gauge. The IAT helps fine‑tune fuelling as air density changes. The CVT fluid temp sensor protects the transmission by adjusting line pressure and shift logic when the fluid’s hot or cold. The ambient sensor feeds the climate control and outside temp display, while the evaporator sensor prevents the A/C from icing up and keeps cabin temps steady.

They’re not regular replacement items, but they do fail occasionally. Clues include hard starts or rough running when cold, poor fuel economy, fans running all the time, odd A/C behaviour, a stuck temperature gauge, CVT going into limp mode, or a check engine light with codes like P0115/P0117/P0118 (ECT) or P0110 (IAT). During servicing, a good workshop will:

• Scan for stored or pending DTCs and check live data to confirm readings make sense for ambient conditions.
• Inspect connectors and looms for corrosion, oil intrusion, or heat damage—especially around the thermostat housing, intake duct/MAF, and front bumper.
• Verify cooling system integrity, because air pockets and low coolant can mimic an “ECT fault”.

If a sensor needs replacing, use OEM‑spec parts. For the ECT, expect a small coolant loss, replace the sealing washer/O‑ring, torque correctly, and bleed the cooling system. For IAT integrated with the MAF, handle the sensor gently—no touching the element—and don’t overtighten. If the CVT temp sensor is faulted, it’s typically serviced with the valve body/mechatronics—best left to a transmission specialist. After any replacement, clear codes and confirm correct readings on a test drive. A dab of dielectric grease on connectors helps in coastal or high‑humidity areas common across Aus and NZ.

• How long do temperature sensors last on a 2023 ASX?
  Most will last the life of the vehicle. Heat cycles, coolant quality, and connector corrosion are the main factors. With proper cooling system maintenance and tidy wiring, it’s common to see well over 150,000 km without drama.
• Can you drive with a faulty temperature sensor?
  You can, but it’s not a great idea. A bad ECT or CVT temp reading can trigger rich running, fan issues, or transmission protection modes, which can snowball into bigger problems. If the A/C sensors play up, comfort suffers and the compressor can ice the evaporator. Get it checked promptly.
• Do new sensors need programming?
  Most temperature sensors on the ASX are plug‑and‑play. After installation, clearing DTCs and checking live data is recommended. The CVT control unit may adapt on its own, no coding is usually needed unless other transmission work is performed.