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VANOS Valve Actuator Replacement – BMW B46/B48 Turbo 4 Cyl. Engine
BMW VANOS stands for Variable Valve Timing System. In layman's terms, it is basically a system that changes the camshaft timing in relation to engine speed by using variable oil pressure. At lower speeds, the VANOS opens the engine valves later creating a smoother and more efficient engine. As engine speed increases, the VANOS opens the valves earlier creating greater torque and better fuel economy. The VANOS valve actuators are simply solenoids that supply the oil pressure necessary to achieve this. When the solenoids fail, there is no more oil pressure and the camshafts stick in a fixed position causing a rough running engine and a dreaded service engine light on your dashboard. The good news is the actuators are relatively inexpensive and easy to install. This article gives detailed instructions on installing VANOS valve actuators in BMW B46/B48 four-cylinder engines.
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Possible Symptoms: Rough running engine, poor fuel economy, poor performance at all speeds
This repair can be used on the following BMW models:
Advanced level repair.
Step 1 - Purchase Parts
You will need the following parts and supplies to perform this repair.
Step 2 - Repair Procedure
Unless otherwise noted, all vehicle repair step images in this article are copyrighted, and used courtesy of BMW of North America, Inc. .
1. Preparing for VANOS valve actuator removal
2. Replacing the VANOS valve actuators
The VANOS valve actuators are located on the rear of the engine. The BMW Repair Guide strongly recommends using a BMW pin wrench (part #83302360895) to remove and install the actuators. If you need this tool, please see our parts block above.
3. Installationr-11-36Copyright BMW Repair Guide 2023 - All Rights Reserved