VANOS Solenoid Valve failure can show itself in a number of ways. From loss of power and torque at low RPM to poor fuel economy, these are just two of the many possible symptoms. New VANOS solenoid valves are a simple and relatively low cost fix that you can do right at home.
The N5X (N51-N55) series of engine covers a wide range of vehicles in the BMW lineup. All of these engines use BMW's variable valve timing system called VANOS. When your VANOS system is failing, you might experience:
- Check Engine Codes
- Difficulty starting your car in cold temperatures
- Loss of power and torque low in the RPM range
- Rough idle
- Increased fuel consumption
If you're experiencing any of the issues above, we recommend replacing the solenoid valves rather than attempting to clean them. In the video below, Gareth, our BMW Catalog Manager, briefly walks you through the way your VANOS system works and why the solenoid valves are prone to failure. Since this system uses one solenoid valve on both the intake and exhaust side (the same product number), we recommend replacing both while you're already in there—if one failed, the other is bound to fail sooner rather than later.
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Writer/Editor at FCP Euro and owner of a daily R53 MINI Cooper, a track-built R53 MINI, and a 1997 Dakar Yellow E36 M3 Sedan. ••• Instagram: @evan.madore