Parts for your 2015 Mitsubishi Lancer-Temperature sensors

2015 Mitsubishi Lancer Temperature Sensors

Temperature sensors are absolutely fitted to the 2015 Mitsubishi Lancer. Mitsubishi’s factory workshop manual for the CJ/CF Lancer (Engine Electrical and Engine Cooling sections) specifies an engine coolant temperature (ECT) sensor for ECU fuelling and fan control, an intake air temperature (IAT) sensor for load and spark strategy, an ambient air temperature sensor for HVAC, and—on CVT models—a transmission fluid temperature sensor. Mitsubishi’s OBD-II DTC documentation also lists codes such as P0115–P0119 (ECT circuit) and P0110–P0113 (IAT circuit), confirming the Lancer relies on multiple temperature inputs for proper operation.

On a 2015 Lancer, these sensors let the ECU make the right calls as conditions change. The ECT tells the computer how warm the engine is so it can adjust cold-start fuelling, ignition timing, idle speed, and radiator fan operation. The IAT helps fine-tune fuelling and spark under hot or cold intake conditions. The ambient sensor keeps the climate control honest, while the CVT temperature input protects the transmission from overheating and manages shift strategy.

There’s no fixed replacement interval for these parts, they’re generally replaced when faulty. As part of routine servicing, it’s smart to:

• Scan live data to confirm ECT and IAT readings track realistically from cold start to operating temp.
• Inspect connectors and wiring under the bonnet for heat or corrosion damage, especially near the thermostat housing/water outlet on the 4B11/4B12 engines.
• Keep cooling system health in check—correct coolant mix, no airlocks, and a sound thermostat all help the ECT read true.

Common signs a temperature sensor is on the way out include hard cold starts, fast or hunting idle, poor fuel economy, the radiator fan running constantly, a thermostat-looking fault with no mechanical cause, CVT entering limp mode on hot days, or the A/C behaving oddly. A scan tool will usually show an implausible reading (for example, ECT stuck cold or pegged hot). Basic checks include resistance testing per the workshop specs and backprobing the connector for reference voltage and signal return.

When replacing an ECT sensor, work on a cold engine, catch and top up coolant, and fit a new seal/O-ring. After installation, bleed the cooling system and confirm fans cycle normally. IAT sensors that are separate from the MAF can sometimes be gently cleaned with electronics/MAF cleaner, if readings remain off, replacement is the go. For CVT temperature issues, diagnosis is best left to a transmission specialist, as that sensor is integrated within the unit on many models.

Popular questions

Where is the engine coolant temperature sensor on a 2015 Lancer?
On the 2.0L/2.4L petrol engines, the ECT sensor is typically threaded into the thermostat housing/water outlet at the front of the engine, near the upper radiator hose. It’s tucked under the intake side—look for a two‑pin connector. CVT fluid temperature sensing is internal to the transmission and isn’t a simple external swap.

Can temperature sensors be cleaned, or should they just be replaced?
The ECT sensor isn’t serviceable—if it’s out of spec, replace it. A standalone IAT sensor can sometimes be cleaned with proper MAF/electronics cleaner if it’s just contaminated. If cleaning doesn’t restore accurate readings, replacement is the reliable fix.

What does it usually cost to replace an ECT sensor in Australia or New Zealand?
As a ballpark, the sensor itself often runs about AUD/NZD $40–$150 depending on brand. Labour is commonly 0.5–1.0 hour. Allow a little extra for coolant top‑up/bleed and diagnostic time if needed. Prices vary by workshop and region.