2003 Nissan Pathfinder Owner's Manual - Page 244

SPARK PLUGS AIR CLEANER SDI0145A SDI1022A SDI1115B REPLACING SPARK PLUGS WARNING Be sure the engine and ignition switch are off and that the parking brake is engaged securely. remove the spark plugs. An incorrect socket can cause damage the spark plugs. Platinum-tipped spark plugs It is not necessary to replace the platinumtipped spark plugs as frequently as the conventional type spark plugs since they will last much longer. Follow the maintenance schedule, but do not reuse them by cleaning or regapping. If replacement is required, see your NISSAN dealer for servicing. Always replace with recommended platinum-tipped spark plugs. The filter element should not be cleaned and reused as it is given a special treatment. We recommended it be replaced according to the maintenance log shown in a separate "Service and Maintenance Guide". When replacing the filter, wipe the inside of the air cleaner housing and the cover with a damp cloth. WARNING ¼ Operating the engine with the air cleaner removed can cause you or others to be burned. The air cleaner Maintenance and do-it-yourself CAUTION Be sure to use the correct socket to 8-23