2005 Hyundai Sonata Owner's Manual - Page 212

6 DO-IT-YOURSELFMAINTENANCE 14 CHANGING THE AIR CLEANER FILTER G070A03Y-AAT ! CAUTION: o Operating your vehicle without using a proper air cleaner filter in place can result in excessive engine wear. o When removing the air cleaner filter, be careful that dust or dirt does not enter the air intake. These may result in damage to the air cleaner filter. G060C04NF 11. Installation is the reverse order of disassembly. HNF5011 The replacement of the air cleaner filter is performed in the following manner. 1. Unsnap the clips around the cover. 2. When this is done, the cover can be lifted off, the old filter removed and the new filter put in its place. Genuine Hyundai replacement parts are recommended. NOTE: Spark plugs should be tightened firmly. (Tightening torque: 18.0 lb.ft (2.5 kgf.m)) Over-tightening can damage the threads in the aluminum cylinder head. Also, leaving them too loose can cause the spark plug to get very hot and possibly result in damage to the engine.