When is it Necessary to Replace Your BMW VANOS System?

BMW cars are luxury models with special features that make them perform better than other vehicles. The VANOS system is one of the additional features, unique to BMW cars that help to improve ride quality and performance. However, it is not uncommon to experience failures in the BMW VANOS system and this could lead to various engine problems which may require that you replace the VANOS system.

So, how do you know when it is time to do this? Our guide will help to answer this question by illuminating the works of the VANOS system in your BMW.

Explaining the VANOS System in Your BMW

The VAriable NOckenwellen Steuerung (VANOS) system is a feature unique to BMW models, that helps BMW engines fix their variable valve timing issues. For optimal engine performance, the engine valves (that control the intake and exit of air) have to open and close as needed.

The timing of these opening and closing actions helps to determine how the engine performs. The VANOS system adjusts the timing of valves opening and closing to match the engine needs based on your BMW’s speed and other driving conditions.

The two main reasons for VANOS system problems in a BMW are:

1. Poor Maintenance: While the VANOS system helps to make your car’s engine stronger and more effective, the lack of maintenance could cause serious issues. Like every other system, the VANOS system needs regular maintenance to keep it functioning effectively. Regular inspections, oil checks and changes, and prompt fixes for faults help to prevent early failure in the system.
2. Engine Overheating: The heat produced by the engine’s activities can also be a reason for VANOS system failures in your BMW. When the engine overheats, its surrounding components, including the VANOS system can be affected. Heat causes problems like broken seals and degradation, which reduces the effectiveness of the system.

Signs that Your BMW Needs a VANOS System Replacement

As discussed above, the VANOS system in your BMW can develop faults that would require a replacement. If you notice any of the following signs in your car, it means your car may be due for a VANOS system replacement.

Reduced Engine Performance

With a VANOS system in your BMW, your car experiences better speed and performance due to the effective opening and closing of the engine valves. However, you may realize that you need a new VANOS system when your engine begins to show signs of poor performance as it indicates that the engine valves are not opening and closing to match the engine needs.

“Check Engine” Light Illuminates

The “check engine” light serves as a warning of impending engine issues in your car and when it comes on, it could mean that there is a VANOS system issue that you have to address. If you ignore this light, the issue could cause more engine problems and even a complete engine failure.

Poor Acceleration

As a part of reduced engine performance, you may notice that your car does not accelerate properly or loses power when you try to accelerate from a stop. This is a sign of a problem with the engine and it could be caused by a faulty VANOS system which affects the entry and exit of air from the engine.

Reduced Fuel Efficiency

Another sign that could indicate a failing VANOS system is poor fuel efficiency. Your car’s fuel economy relies on the effectiveness of all engine components. However, a VANOS system problem can affect the air-fuel mixture in the car’s engine, leading to engine issues and burning more fuel which lowers fuel economy.

The Top Garage in California for BMW VANOS System Problems

It is not news that the VANOS system is unique to BMW models, so fixing its issue can bring a challenge, as not all mechanics are experienced in handling this BMW-specific feature. To get the best care for your car, you need to find a mechanic who knows the VANOS system well enough to correct its issues.

Marlow Motor-Werks is your auto service shop with technicians who have the experience and certification to work on German-made vehicles including BMWs. We not only have the hands, but also the space and facilities to handle maintenance, repairs, and replacement of parts for your luxury car or SUV. Visit our shop in Seaside, CA from nearby areas for the best care for your BMW!

* White BMW Car image credit goes to: Brandon Woyshnis.