The camshaft position sensor is mounted on the engine’s timing cover, but the exact spot depends on the engine. For the 2005 Altima, two common engines exist: the 2.5-liter four-cylinder (QR25DE) and the 3.5-liter V6 (VQ35DE). The sensor’s position differs accordingly.
Engine options and sensor placement
This section explains where to look for the camshaft sensor on the two engines that were available in the 2005 Altima. Use these as a starting point, and consult the service manual for your specific VIN and engine code to confirm exact location and connector orientation.
2.5-liter QR25DE four-cylinder
Location: The camshaft position sensor on the QR25DE sits on the rear portion of the cylinder head, near the firewall, attached to the timing chain cover. The electrical connector typically points toward the back of the engine bay and is a small two- or three-wire sensor with a gray or black plastic housing.
3.5-liter V6 VQ35DE
Location: On the 3.5L V6, the camshaft position sensor is mounted on the timing cover at the front of the engine, near the belt drives. It’s accessible from the top of the engine bay and features a multi-pin electrical connector that runs toward the wiring harness.
What to do if you can't locate it
If you still can't find it, look for the other sensors on the timing cover for reference, or follow the wiring from the crankshaft position sensor (usually near the crank pulley) back to the CMP sensor. A service manual or repair diagram will provide exact coordinates for your VIN.
Summary
In short, the camshaft position sensor on a 2005 Nissan Altima is located on the timing cover, with the QR25DE 2.5L engine having it at the rear of the cylinder head near the firewall, and the VQ35DE 3.5L engine having it at the front of the engine on the timing cover. If you’re replacing or testing it, ensure the engine is off, disconnect the battery, and handle the connector and mounting bolts carefully.