One problem related to engine clicking and tapping noises has been reported for the 2006 Nissan Titan. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 Nissan Titan based on all problems reported for the 2006 Titan.
My husband went to see his mom and about 20 miles from our home approximately 5 miles away from destination the truck started vibrating and sputtering then the engine started making a loud clanking noise then shut of mechanic said the engine was blown prior to all this engine started cutting out while driving on the freeway when we went to do our smog check it failed because of the catalytic converters had to be replaced due to the fact that the honeycomb was completely gone.