Owners of other Mitsubishi vehicles such as the Outlander Sport, Eclipse Cross, Mirage, Mirage G4, Lancer, ASX, Montero Sport, Pajero, Xpander, Strada and RVR may also find these DIY instructions to be helpful.

The OEM (original equipment manufacturer) spark plugs in this 2020 Outlander SEL were part number NGK DILKR6D 11G iridium tipped (also known as DILKR6D-11G, DILK6RD11G and Mitsubishi 1822A088).

A few compatible replacement aftermarket spark plugs with their part numbers are as follows: Autolite XP5702, NGK 95264 and Autolite APP5702.

The tools needed to complete this procedure include a 10mm socket with a 1/4" drive ratchet, a 5/8" spark plug socket, a long 6" or 9" extension bar, a 3/8" drive ratchet and a tube of dielectric grease.

The first step is to open the hood. Then locate the two black metal bolts on the top of the plastic engine cover.

The left side bolt is near the plastic handle for the oil level dipstick. The second bolt on the right is situated near the "C" in "MIVEC" printed on the engine cover.

You could also use a large Phillips head screwdriver to remove the engine cover bolts.

Use a needle nose pliers to pull the two bolts out of their wells. Set the two bolts aside in a safe place.

Gently pull up the front edge of the engine cover to release the plastic peg from the rubber socket.

Set the engine cover aside in a safe place.

Once the cover has been removed, you'll be able to see the four black plastic ignition coil assemblies on the valve cover.

To help reduce the risk of having a foreign object or any debris fall down into the spark plug well, clean off the top of the engine with compressed air or use a wet/dry shop vacuum.

A small amount of oil might weep out of the rubber hose or the PCV valve.

To further reduce the risk of having a foreign object or any other debris fall down into the cylinder, I recommend only checking or changing one spark plug at a time.

Push in the release tab on the electrical connector before sliding it straight off the ignition coil.

Set the bolt aside in a safe place.

Lift the ignition coil straight out of the spark plug well. Set the coil aside in a safe place.

If you see a CEL (check engine light) or SES (service engine soon) warning indicator on your car's instrument gauge cluster, use an OBDII scanner (also known as an OBD2 scan tool) to check for an ignition coil related DTC (diagnostic trouble code) such as P0350, P0351, P0352, P0353 or P0354.

If you need to replace a faulty ignition coil, the OEM part number is Mitsubishi 1832A083 (full part number on the OEM coil was "DE FK0488 1832A083 9Y07G1").

Two compatible replacement aftermarket ignition coils include the Spectra C-911 and the Garage-Pro ‎JCWRM50460018GP.

Attach the 5/8" spark plug socket to a long extension bar and the 3/8" drive ratchet.

I like to attach the socket to the extension bar with some electrical tape to make sure it won't pop off and become stuck down in the bottom of the spark plug well.

Carefully loosen the old spark plug by turning it in the counterclockwise direction.

If you have trouble loosening the old plug, try spraying a very small amount of penetrating oil down into the well. Literally just a few drops should be enough.

Allow the penetrating oil to seep down into the threads and loosen any corrosion (rust) for at least 10 to 15 minutes.

Once the spark plug is loose, detach the ratchet and spin it out the rest of the way by hand.

Lift the old plug out of the well and pull it from the socket.

Inspect the old spark plug for any soot, sludge, white ash or abnormal wear.

If the end of the old spark plug looks ashy white, the plugs might have been exposed to high temperatures such as engine overheating or they are the incorrect heat range for your driving conditions or environment.

If the old spark plugs are dark grey or covered in black oily soot, the engine might be burning oil and should be inspected by a professional mechanic.

(Note - Most spark plug manufacturers recommend that you do NOT use anti-seize lubricant grease on the threads of the new spark plugs since it can easily lead to over tightening.)

Please double check the gap specifications for the spark plugs that you are installing.

Push the new spark plug into the socket. Your socket should either have a strong magnet or a rubber insert to securely hold the plug in place.

Lower the new spark plug down into the well and spin it in a few turns by hand in the clockwise direction to help prevent it from becoming cross threaded.

Tighten the new plug in the clockwise direction with the 3/8" drive ratchet until it is snug or about 1/8th to 1/4th of a turn past finger tight.

If you have a very sensitive and reliable torque wrench, the Outlander service manual specification for tightening the spark plugs is 19 lb-ft +/- 3 lb-ft (or 25 N*m +/- 5 N*m).

Try to avoid over tightening the new spark plugs.

Apply a small amount of dielectric grease to the opening in the rubber dust boot at the bottom of the ignition coil.

The dielectric grease will help ensure a reliable electrical connection by keeping out any dust, debris or moisture.

Carefully lower the ignition coil down into the well and push the rubber dust boot over the top of the new spark plug.

Rotate the coil back and forth a few times to help spread the dielectric grease.

Spin in the black metal bolt a few turns by hand in the clockwise direction to help prevent it from becoming cross threaded.

Tighten the bolt in the clockwise direction until it is snug.

Try to avoid over tightening the bolt to prevent from cracking the plastic ignition coil housing.

(The shop manual torque specification for tightening the ignition coil bolt is 89 in-lbs.)

Push the electrical connector on to the ignition coil.

You should feel or hear the power plug "click" securely into place.

Lower the plastic cover back down over the top of the engine and push on the front edge to secure the friction fastener in place.

(The service manual torque specification for the engine cover or "plastic baffle" bolts is 27 in-lbs.)

To test the new spark plugs, start the engine and listen closely for any strange sounds. If you do hear a weird noise, immediately turn off the ignition and check your work.

Be sure to write down the procedure in your vehicle's service records.

According to the schedule in the "Warranty and Maintenance Manual", the OEM spark plugs service interval specification is to change them every 105,000 miles (168,000 km) or at least every 84 months (7 years).

Please check out all of the 2014-2021 Mitsubishi Outlander DIY Repair & Maintenance Guides.