NOTE: Nissan does not provide specific instructions for knock sensor replacement. The knock sensor is installed in the top, center of the engine block. Access can be gained by removing the intake manifold. REMOVAL
Note : After installing the tensioner, race the engine at about 3,000 rpm under no load to purge air from the high-pressure chamber. The engine may produce a rattling noise. This indicates that air still remains in the chamber and is not a matter of concern.