Mitsubishi"s service engine soon, also recognized as a check engine light, can come on as soon as the On-Board Diagnostic (OBD) system detects a problem with the engine, emissions system, and/or transmission.

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If her Mitsubishi inspect engine light stays on, an initial check the the gas lid is top top tight.

If that is no the problem, check out the error codes by connecting an OBD2 scanner to the diagnostic port located under the dashboard. See the indict below. 


On some Mitsubishi models, the inspect engine light might come on instead of the company engine soon. Both this lights offer the exact same functions.

"Check engine light" and the "service engine soon" messages should not be puzzled with regimen Maintenance. Lock are required message which are meant to repeat the driver of constant maintenance.


What you may notice when your Mitsubishi company engine quickly light comes on:

Mitsubishi operation roughEngine misfire or judderingLack the powerPoor accelerator responseUnusual sound native the engineSmoke from the exhaustOverheatingEngine idles too high.The engine dies soon after that is started.

These symptoms suggest that the engine in your car is not working as that should.

If your Mitsubishi service engine quickly light is on, but the auto runs and also drives fine, the problem can be because of an evaporative leak in the fuel mechanism or a loosened gas cap.

What causes Mitsubishi inspect Engine Light?


The most usual problems that trigger the Mitsubishi check engine or company engine"s shortly light space faulty oxygen sensor, dirty mass airflow sensor (MAF), worn spark plugs, poor ignition coil, and loose gas cap.

There space hundreds of feasible issues that have the right to turn on the inspect engine light on a Mitsubishi vehicle. To uncover out why the irradiate is on, check out the error codes v an OBD-II scanner. 

1. Spark Plugs

Old spark plugs will reason your Mitsubishi inspect engine light to come on v fault codes P0300, P0301, P0302, P0303, P0304.

Also, castle can reason your vehicle to have decreased power and a diminish in fuel economy. Store in mind the driving with negative spark plugs may damage your catalytic converter and oxygen sensors.

Faulty spark plugs are a typical problem the triggers the check engine light on Mitsubishi cars. The trouble is usually not the manufacturer"s fault but lacks maintain on the owner"s part. Spark plugs space maintenance items and need to be replaced as the vehicle nears the 100k mile mark.

Check her owner"s hand-operated for the details recommended spark plug instead of interval.

2. Fixed Air flow Sensor

The engine in her Mitsubishi has, in many cases, an combined MAF sensor and also intake air temperature sensors. V time, the can obtain contaminated through dirt, offering false readings. This will an outcome in stormy idle, lack of power, or skepticism on accelerations.

Cleaning the sensor is quite an easy but just use MAF cleaner liquid for this job.

Another possibility is an input leak. Codes: P0102 (Mass air flow sensor), P0113 (Intake wait temperature sensor)

3. Coolant Temperature Sensor

Some Mitsubishis room somewhat much more prone come coolant temperature sensor issues. A faulty CTS will give false temperature readings, causing, in many cases, the engine to operation rich.

Also, it will show the incorrect and misleading temperature analysis on your dashboard. In addition to the sensor itself, make certain the wiring is no damaged. Code: P0115 (Coolant temperature sensor malfunction)

4. Vacuum Leak

All turbocharged engines, and also especially diesel ones, have the right to suffer from under-boost. This is a case where the desired an increase pressure is not reached. It have the right to be resulted in by a substantial intake leak or a crack at vacuum hoses that regulate the turbo. Another possibility is an too much carbon build-up inside the entry manifold.

This difficulty may cause fault code P0299 (Boost pressure regulation control variety not reached).

5. EVAP Leak

A small leak v the EVAP system is a widespread problem.

The very first thing to inspect is if the fuel tank cap is loose. Various other possibilities room cracks in EVAP hoses, vapor canisters, faulty purge, or canister vent valves. The best way to discover a fault is to test the entirety system through a exhilaration generator machine.

This trouble may trigger the fault code P0456 (Evaporative Emissions device - small leak detected)

6. Emissions Issue

A examine engine light resulted in by emissions control-related problems is something you are most likely to encounter if you drive a higher-mileage Mitsubishi.

Although this will be signaled together a catalytic converter through low efficiency, you quickly have a faulty downstream O2 sensor. Make certain to preeminence this the end before an altering a much more expensive catalytic converter.

This trouble may create fault password P0420 or P0431 (Catalyst Efficiency listed below Threshold).

7. Infection Problem

Transmission worries in cars equipped through a CVT gearbox space usually caused by a faulty transmission liquid pressure switch, which controls the speak converter solenoid operation. Together this move is installed on the external side the the gearbox, it deserve to be easily replaced.

This trouble may trigger the error code, P0842 (transmission fluid pressure move circuit low).

8. Throttle position Sensor

The throttle place sensor (TPS) monitors how much the throttle valve (or blade) is open, identified by how much down the accelerator pedal has been pushed. The TPS deserve to fail to cause the examine engine light. In addition, friend may an alert erratic idle or the engine shutting under at low RPMs. 

If you have identified that the trouble is led to by the faulty TPS, you might follow these steps to change it.1. Permit the engine cool down.2. Place the vehicle in park.3. Pop the hood.4. Take the end the air water tap by remove the clamp and also 4 screws. 


5. As soon as you pulled out the waiting hose, girlfriend will have actually an unrestricted see of the TPS.


6. You can now eliminate it, change it v a brand-new one, and also re-connect the waiting hose.

Please keep in mind that you may need to execute a re-programming and re-learn after ~ installation. These deserve to be done using a Mitsubishi OBD2 scan tool.

9. DPF (Diesel models)

Most 2007 or newer Mitsubishis v diesel engines have a Diesel Particulate Filter or DPF. This is a an equipment that traps the soot from the exhaust.

It can get clogged over time, leading to high temperatures and also excessive back-pressure. In most cases, the build-up can be shed off by triggering a rejuvenation process.

This trouble may cause fault code: P1499 (DPF temperature abnormally high).

How come Reset Mitsubishi inspect Engine Light?



When the examine engine light come on, a trouble code will be sent to the ECU. 

Use one OBD-II scanner to read the codes via the diagnostic harbor under the driver"s next dashboard.

Plug an OBD-II scanner into the diagnostic harbor under the dashboard. Turn ~ above the ignition however don"t rotate on the engine. Turn on the scanner and also select check out Fault Codes. Find out what caused each code and fix every problems. Go back to the key menu and select clean Fault Codes, then press ok. 

Once the repair has been made, the code have the right to be erased. Most OBD2 scanners and also all scan tools can do this with the push of a button.

All 1996 and also later Mitsubishi vehicles space equipped with an OBD-II diagnostic system.

Mitsubishi check Engine irradiate Flashing On and Off

If her Mitsubishi check engine irradiate is flashing, stop driving for an extensive time. Doing so will damages the catalytic converter and even result in the engine overheating.

Flashing service engine quickly light method that there is an engine misfire, which in most situations is led to by a faulty spark plug or poor ignition coil. 

Can a loosened Gas Cap cause a check Engine Light? 

If her Mitsubishi inspect engine light come on ~ refueling, over there is a good chance the you have a loose gas cap or negative fuel quality. 

A loose or lacking fuel cap on a Mitsubishi can trigger the check engine light due to the fact that it provides the On-Board Diagnostic device think there is a trouble with the fuel system.

Tighten the gas cap or replace it, but don"t intend the inspect engine irradiate to reset immediately. It might take 2 to four days because that the inspect engine irradiate to reset on its own.


If her Mitsubishi check engine light remains on, very first check the the gas lid is top top tight. Tighten the gas cap. If no various other codes are present, the check engine light will reset within 2 to three days of regular driving. 

If the examine engine or company engine soon lights remain on, review the fault codes by connecting one OBD2 scanner right into the diagnostic port situated under the dashboard.

Always study the code and possible causes. Don"t replace parts based upon the fault code alone. Gain a second opinion native a mechanic if necessary.

If you space the initial owner, your Mitsubishi is less than 10 years old and also has much less than 100,000 miles. Your car may still be under warranty. A Mitsubishi dealer must diagnose and also fix her problem cost-free of charge.

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This guide uses to every 1996 and newer Mitsubishi vehicles, consisting of Lancer, Montero, Outlander, Galant, Eclipse, Raider, Pajero, Mirage, etc.