Owners of other Jeep, Dodge and RAM vehicles such as the Grand Cherokee, Wrangler, Renegade, Gladiator, Cherokee, Grand Wagoneer, Wagoneer, Charger, Challenger, Durango, RAM 1500, Promaster, 2500 and 3500 may also find these DIY instructions to be helpful.

The OEM (original equipment manufacturer) spark plugs were marked as part number Champion REC10WMPB4 (iridium tipped). They are also known as Champion # 9775.

A few other compatible replacement iridium tipped spark plugs with their part numbers are as follows: Autolite XP5325, NGK 92145 (also known as LZFR5CI11) and NGK 4469 (or LFR5AIX-11).

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

The first two steps are to open the hood and then locate the silver metal bolt on the rear left corner of the black plastic engine cover.

Loosen the bolt by turning it in the counterclockwise direction with a 10mm socket and a 1/4" drive ratchet.

The plastic engine cover is still held in place by a few rubber friction fasteners attached to metal pegs on the top of the intake manifold.

Carefully pull up the plastic cover to release the rubber friction fasteners.

If you have access to compressed air or a wet/dry shop vacuum, clean off the top of the engine.

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

Gently side the red lock tab out and away from the ignition coil to unlock the power plug.

Push down the release button on the electrical connector before sliding it straight off the ignition coil.

Set the ignition coil bolt aside in a safe place.

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

If you need to replace a faulty ignition coil, the OEM part number is Mopar 68242286AB.

I always use a piece of electrical tape or painter's tape to help secure the socket to the extension bar to keep it from popping off in the bottom of the spark plug well.

Lower the socket down over the top of the old spark plug.

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

If you have trouble loosening the old spark plug due to corrosion (rust) or debris such as sand, try spraying a very (tiny) amount of penetrating oil into the well and allow it to seep down into the threads for at least 10 to 15 minutes.

Spin out the old plug the rest of the way by hand by using the extension bar.

Carefully lift the old spark plug out of the well and detach it from the socket.

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

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

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

(Warning - 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.)

Push the new spark plug into the socket.

Your spark plug socket should have a magnet or a rubber insert to securely hold the plug in place.

Carefully lower the new spark plug into the well and tighten it in the clockwise direction until it is snug.

Continue tightening it about 1/4 turn past finger tight to crush the new washer (or "gasket").

If you insist on using a torque wrench to tighten the spark plugs, the torque specification in the service manual is 20 lb-ft (or 27 N-m).

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 moisture or debris.

Lower the ignition coil back down into the spark plug well.

Push on the ignition coil to seat the rubber dust boot over the top of the new spark plug.

Tighten the bolt in the clockwise direction with the 10mm socket and a 1/4" drive ratchet until it snug.

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

Push the electrical connector straight on to the ignition coil.

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

Lower the plastic engine cover back down into place.

Push on the cover to secure the rubber friction fasteners to the metal pegs.

Tighten the bolt with the 10mm socket and a 1/4" drive ratchet until it is snug. Try to avoid over tightening the bolt to prevent from cracking the plastic engine cover.

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

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

According to the servicing and maintenance schedule in the owner's manual, the OEM spark plugs should be changed after 100,000 miles (160,000 km) or at least every 10 years.

Please check out all of my 2017-2022 Jeep Compass DIY Repair & Maintenance Guides.