On 1.8L four-cylinder and 3.0L V6 models, the variable camshaft adjustment solenoid valves are integrated with the camshaft timing chain sprocket, and replacement involves specific steps. For 2.0L models, the solenoid is located at the back end of the cylinder head, requiring the removal of the engine cover, detaching the engine harness clip, disconnecting the electrical connector, removing the mounting bolt, and pulling the valve out, followed by discarding the old O-ring and reversing the process for installation with a new O-ring. In 3.2L V6 models, the solenoid valves are situated on the valve covers, with four valves total-two for each camshaft. The left cylinder head has both valves on the top of the left valve cover, while the right cylinder head has the intake cam solenoid at the upper inner edge and the exhaust cam solenoid near the back end of the right valve cover. The procedure includes removing the front and rear engine covers, detaching the coolant expansion tank if working on the left head, removing the air inlet duct if on the right head, disconnecting the electrical connector, removing the mounting bolt, discarding the old O-ring, and reinstalling with a new O-ring.