Mitsubishi"s service engine soon, also well-known as a check engine light, deserve to come on when the On-Board Diagnostic (OBD) system detects a problem with the engine, emission system, and/or transmission.

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If your Mitsubishi examine engine light remains on, an initial check the the gas lid is top top tight.

If that is not the problem, check out the fault codes by connecting an OBD2 scanner to the diagnostic port situated under the dashboard. Check out the instructions below. 


On some Mitsubishi models, the check engine light may come on rather of the service engine soon. Both these lights serve the same functions.

"Check engine light" and the "service engine soon" messages should not be perplexed with regime Maintenance. They are required message which are meant to remind the driver of continuous maintenance.


What girlfriend may notice when your Mitsubishi organization engine quickly light come on:

Mitsubishi operation roughEngine misfire or judderingLack the powerPoor throttle responseUnusual sound native the engineSmoke native the exhaustOverheatingEngine idles too high.The engine dies quickly after the is started.

These symptoms indicate that the engine in your vehicle is not working as it should.

If your Mitsubishi service engine soon light is on, but the vehicle runs and drives fine, the problem could be due to an evaporative leak in the fuel device or a loosened gas cap.

What causes Mitsubishi check Engine Light?


The most typical problems that trigger the Mitsubishi check engine or organization engine"s soon light space faulty oxygen sensor, dirty mass airflow sensor (MAF), worn spark plugs, negative ignition coil, and loosened gas cap.

There are hundreds of feasible issues that can turn on the examine engine light on a Mitsubishi vehicle. To find out why the irradiate is on, review the fault codes v an OBD-II scanner. 

1. Spark Plugs

Old spark plugs will reason your Mitsubishi inspect engine irradiate to come on through fault password P0300, P0301, P0302, P0303, P0304.

Also, lock can cause your car to have reduced power and also a diminish in fuel economy. Save in mind that driving with bad spark plugs may damages your catalytic converter and also oxygen sensors.

Faulty spark plugs space a usual problem that triggers the examine engine light on Mitsubishi cars. The difficulty is normally not the manufacturer"s fault yet lacks maintain on the owner"s part. Spark plugs space maintenance items and also need come be replaced as the car nears the 100k mile mark.

Check her owner"s manual for the details recommended spark plug instead of interval.

2. Fixed Air flow Sensor

The engine in her Mitsubishi has, in most cases, an combined MAF sensor and intake air temperature sensors. V time, it can gain contaminated v dirt, giving false readings. This will result in turbulent idle, absence of power, or uncertainty on accelerations.

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

Another possibility is an entry leak. Codes: P0102 (Mass airflow sensor), P0113 (Intake air temperature sensor)

3. Coolant Temperature Sensor

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

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

4. Vacuum Leak

All turbocharged engines, and especially diesel ones, have the right to suffer from under-boost. This is a instance where the desired rise pressure is not reached. It can be led to by a massive intake leak or a crack at vacuum hoses that manage the turbo. An additional possibility is an too much carbon buildup inside the intake manifold.

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

5. EVAP Leak

A little leak through the EVAP mechanism is a extensive problem.

The first thing to examine 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 method to find a fault is to check the whole system v a exhilaration generator machine.

This problem may cause the fault password P0456 (Evaporative Emissions device - small leak detected)

6. Emissions Issue

A check engine light brought about by emissions control-related concerns is something girlfriend are 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 dominance this out before changing a much an ext expensive catalytic converter.

This problem may cause fault password P0420 or P0431 (Catalyst Efficiency listed below Threshold).

7. Infection Problem

Transmission concerns in car equipped v a CVT gearbox space usually resulted in by a faulty transmission fluid pressure switch, which controls the speak converter solenoid operation. As this switch is installed on the external side of the gearbox, it can be easily replaced.

This problem may create the fault code, P0842 (transmission fluid pressure switch circuit low).

8. Throttle position Sensor

The throttle position sensor (TPS) monitors how much the accelerator valve (or blade) is open, established by how much down the accelerator pedal has actually been pushed. The TPS can fail to cause the check engine light. In addition, girlfriend may an alert erratic idle or the engine shutting under at low RPMs. 

If girlfriend have established that the problem is brought about by the faulty TPS, you may follow these procedures to replace it.1. Permit the engine cool down.2. Place the auto in park.3. Pop the hood.4. Take the end the air water tap by removed the clamp and 4 screws. 


5. When you pulled out the wait hose, you will have an unrestricted check out of the TPS.


6. You can now remove it, replace it v a brand-new one, and re-connect the waiting hose.

Please note that you may need to do a re-programming and also re-learn ~ installation. These deserve to be done making use of a Mitsubishi OBD2 scan tool.

9. DPF (Diesel models)

Most 2007 or more recent Mitsubishis with diesel engines have actually a Diesel Particulate Filter or DPF. This is a maker that catch the soot indigenous the exhaust.

It can acquire clogged over time, bring about high temperatures and also excessive back-pressure. In many cases, the buildup can be burned off by triggering a regeneration process.

This difficulty may trigger fault code: P1499 (DPF temperature abnormally high).

How come Reset Mitsubishi examine Engine Light?



When the check engine light come on, a trouble password will be sent out to the ECU. 

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

Plug one OBD-II scanner right into the diagnostic harbor under the dashboard. Turn on the ignition but don"t revolve on the engine. Turn ~ above the scanner and also select check out Fault Codes. Uncover out what resulted in each code and fix all problems. Go earlier to the key menu and also select clear Fault Codes, then press ok. 

Once the repair has actually been made, the code deserve to be erased. Most OBD2 scanners and all scan tools deserve to do this with the press of a button.

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

Mitsubishi inspect Engine light Flashing On and also Off

If her Mitsubishi inspect engine light is flashing, protect against driving for an extended time. Doing therefore will damage the catalytic converter and also even cause the engine overheating.

Flashing service engine quickly light way that there is an engine misfire, i beg your pardon in most situations is caused by a faulty spark plug or poor ignition coil. 

Can a loosened Gas Cap cause a examine Engine Light? 

If her Mitsubishi inspect engine light come on ~ refueling, there is a good chance that you have actually a loosened gas cap or poor fuel quality. 

A loosened or absent fuel cap on a Mitsubishi can create the examine engine light since it makes the On-Board Diagnostic mechanism think there is a trouble with the fuel system.

Tighten the gas lid or replace it, yet don"t mean the examine engine irradiate to reset immediately. It might take two to four days because that the examine engine light to reset top top its own.


If your Mitsubishi examine engine light continues to be on, very first check the the gas cap is on tight. Tighten the gas cap. If no other codes are present, the examine engine light will certainly reset within 2 to three days of normal driving. 

If the inspect engine or company engine soon lights stay on, read the fault codes by connecting one OBD2 scanner right into the diagnostic port located under the dashboard.

Always research the code and possible causes. Don"t change parts based on the fault code alone. Acquire a 2nd opinion indigenous a mechanic if necessary.

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

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This guide applies to all 1996 and also newer Mitsubishi vehicles, including Lancer, Montero, Outlander, Galant, Eclipse, Raider, Pajero, Mirage, etc.