Owners of other Nissan, Infiniti or related Renault vehicles such as the Rogue, X-Trail, Note, Versa, Rogue Sport / Qashqai, Maxima, Sentra, Juke, Kicks, Murano, Pathfinder, Armada, Frontier, Titan, Quest, NV200, Q50, Q60, QX50, QX60 and QX80 may also find these DIY instructions to be helpful.

The tools and other items needed to complete this procedure include a 10mm socket with a 1/4" drive ratchet, a 14mm spark plug socket, a long extension bar, a 3/8" drive ratchet and a tube of dielectric grease.

The OEM (original equipment manufacturer) iridium tipped spark plug part number is Denso DXE22H11C.

Another compatible replacement spark plug is the Bosch 9621.

The first two steps are to open the hood and then pull off the plastic engine cover. Set the engine cover aside in a safe place.

To help prevent from having debris fall down into the spark plug wells, clean off the top of the engine with a wet/dry shop vacuum or use compressed air.

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

Push down the release tab on the gray plastic electrical connector before sliding it straight off the ignition coil.

Lift the ignition coil straight out of the spark plug well.

(A 9/16" spark plug socket would also work.)

Loosen the old spark plug by turning it in the counterclockwise direction.

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

Inspect both ends of the old spark plug.

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

On the other hand, if the old spark plug is grey or covered in dark black soot, the engine might be burning oil and should be inspected by a professional mechanic.

If you have a spark plug gap gauge tool, check the gap on the new spark plugs.

The OEM Denso plugs should be gapped to .043" (or 1.1mm). Check the box for the correct gap if you purchased a different spark plug.

Insert the new spark plug into the socket.

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

Carefully lower the new spark plug down into the well.

Spin in the new spark plug by hand in the clockwise direction until it makes contact with the cylinder head.

Tighten the spark plug in the clockwise direction with the 3/8" drive ratchet until is snug.

The service manual for the previous generation Nissan Altima with the QR25DE 2.5L I4 engine had a spark plug torque specification of 15 to 21 lb-ft. I imagine it is a similar if not the same torque value for this PR25DD 2.5L I4 engine.

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

Lower in the ignition coil and push it down on to the top of the new spark plug.

Line up the bolt holes and replace the 10mm ignition coil bolt.

Tighten the 10mm bolt in the clockwise direction until it is snug.

Push on the plastic engine cover.

Be sure to record the spark plug change in your vehicle's service records.

According to the maintenance schedule in the owner's manual, the spark plugs should be replaced every 105,000 miles (or every 168,000 km).

Please take a look at all of my 2019-2024 Nissan Altima DIY Repair & Maintenance Guides.