Parts for your 2000 Mitsubishi Lancer-Temperature sensors

2000 Mitsubishi Lancer temperature sensors — what they do and how to look after them

Based on the Mitsubishi factory service manual for CE/CG Lancer (1996–2003), common aftermarket manuals, and OBD‑II requirements (SAE J1979), the 2000 Mitsubishi Lancer is definitely fitted with temperature sensors. These include the Engine Coolant Temperature (ECT) sensor for the engine computer, a separate single‑wire sender for the dash gauge, an Intake Air Temperature (IAT) sensor, and on automatic models, a transmission fluid temperature sensor. Many trims also use an ambient air temperature sensor for the HVAC/air‑con system.

On this Lancer, the ECT sensor is the big decision‑maker. It tells the ECU how warm the engine is so it can set fuel delivery, ignition timing, idle speed, and radiator fan control. A dodgy reading can cause hard cold starts, rich running, high idle, poor fuel economy, or fans kicking in at the wrong time. The IAT sensor helps the ECU account for air density changes so it doesn’t run the mixture too rich or lean as temperatures swing. If it’s an auto, the transmission temp sensor influences shift timing and line pressure to protect the gearbox, especially on hot Aussie and Kiwi days or when climbing hills.

Routine servicing doesn’t usually call for scheduled replacement of these sensors, but keeping them happy is straightforward. Fresh coolant at the recommended interval prevents corrosion around the ECT boss and ensures good heat transfer. After any cooling‑system work, bleed air properly so the ECT sees true coolant, not air pockets. Inspect connectors under the bonnet for brittle plastics, green corrosion, or oil soak, clean with proper electrical contact cleaner if needed. Avoid oiled pod filters that can contaminate an IAT built into the airflow meter on some Lancer variants.

If faults pop up (common codes: ECT P0115–P0119, IAT P0110/P0112/P0113, auto trans P0711), check live data with a scan tool. A cold engine’s ECT and IAT should read close to the outside temperature. Where required, compare sensor resistance to the workshop manual’s temperature chart. When replacing an ECT sensor, work on a cold engine, relieve pressure, catch the coolant, swap the sealing washer/O‑ring, and tighten to the manual’s torque spec. Refill, bleed, run the fans, check for leaks, clear codes, and verify temps on a test drive. Quality OEM or reputable aftermarket sensors are worth it, cheapies can drift and cause headaches.

• Typical locations: ECT in the thermostat housing or head water outlet (two‑pin), dash gauge sender nearby (single‑pin), IAT in the intake duct or integrated with the airflow meter.
• Watch for symptoms: rough idle, poor economy, black exhaust smoke, fans running constantly, or erratic gauge behaviour.

Popular questions about 2000 Mitsubishi Lancer temperature sensors

How many temperature sensors does a 2000 Lancer have?
Most models have at least three: an ECU coolant temp sensor (ECT), a separate single‑wire sender for the dash gauge, and an Intake Air Temperature (IAT) sensor. Automatic versions add a transmission fluid temperature sensor, and many trims include an ambient air temp sensor for the HVAC system.

Where is the coolant temperature sensor located?
On the 2000 Lancer it’s typically threaded into the thermostat housing or the cylinder head’s water outlet. The ECU ECT sensor is a two‑pin connector, while the nearby single‑pin sender feeds the dash gauge. Always confirm the exact spot in the workshop manual for your engine code.

Do temperature sensors need regular replacement?
Not on a schedule. They’re replaced when faulty or out of spec. Keeping the cooling system serviced, connectors clean, and air filters dry (no excess oil) will help these sensors live a long, drama‑free life. Use a scan tool to verify readings before swapping parts.