The car has two camshaft position sensors. The 2011 328i uses an inline-6 engine with dual camshafts and relies on two CMP sensors to monitor both camshafts for VANOS timing.
Understanding the sensor setup
Knowing how many camshaft sensors this model uses helps with diagnostics and maintenance. The N52 engine in the 2011 328i typically employs two camshaft position sensors to provide timing data for both the intake and exhaust cams, which supports the engine’s variable timing system (VANOS).
Where the sensors are located
Before listing the locations, note that the two camshaft sensors are mounted near each camshaft on the cylinder head. The typical locations are:
- Exhaust camshaft position sensor: located near the rear/top of the engine by the exhaust cam on the cylinder head.
- Intake camshaft position sensor: located near the front/top of the engine by the intake cam on the valve cover/head region.
These sensors feed real-time timing data to the engine control unit to coordinate VANOS and maintain proper cam timing. If a fault code references CMP or camshaft issues, inspect both sensors and their wiring.
Maintenance and troubleshooting
When replacing camshaft position sensors, use OEM or high-quality aftermarket parts. Also inspect connectors and wiring for damage or corrosion, since a bad connector can mimic a faulty sensor and trigger similar codes.
Summary
For a 2011 BMW 328i, expect two camshaft position sensors—one for the intake camshaft and one for the exhaust camshaft. This dual-sensor configuration supports the VANOS system and accurate engine timing. If you’re diagnosing timing or sensor issues, verify both sensors and their wiring and refer to the vehicle’s service manual for exact locations and testing procedures.