Low battery voltage, Damaged wire harness, Dirty ABS wheel speed sensor, Bad brake light switch. To find out why the ABS light is on, read the codes with a Volkswagen scanner via the diagnostic port underneath the dashboard on the driver's side. Let's take a look at how to diagnose VW ABS light. 1. Faulty ABS speed sensor The ABS control unit receives data regarding each wheel's speed from the wheel sensors. When one or more wheels begin to slide, the ABS control unit monitors this data and makes the required adjustments. Driver 81. 139K subscribers. 154K views 8 years ago. This video explains why the ABS warning light is illuminated in your car. For ABS reset tools click here The esp/bas light and abs light came on along with my tc Q: The esp/bas light and abs light came on along with my tc light, what does this mean. asked by Tommy C on January 27, 2018 The wheel speed sensors (ABS sensors) must have seen a bad signal for some reason, this can sometimes be caused by a bit of dirt or a piece of rust from the hub sticking to the magnetic tone wheel which disrupts the signal briefly and flags the warning light. There are several faults that could be behind an ESP warning light on your dash. These are: Faulty Wheel ABS Sensors. The sensors in the wheels provide the ABS control unit with information about each wheel's speed. This allows the ABS to make the necessary corrections if one or more of the wheels slips. Dirty tone ring Bad ABS module BRAKE light: Low brake fluid Low brake pads Parking brake set Any ABS fault (illuminated in tandem with ABS light on certain vehicles) Depending on the year of the vehicle, most ABS codes can be read by OBDII-based diagnostic tools on '96+ vehicles. 3) Check the Stator Ring. The ABS wheel sensor works together with the stator ring to monitor wheel speed rotation. If the stator ring is damaged, it can cause a malfunction of the ABS. Check to ensure the stator ring is not damaged or dislodged, resulting in missing teeth activating the ABS light. There are many causes which could make an ABS light come on. It doesn't always mean there is a problem with the anti-lock braking system directly. There could also be a problem with other sensors or components that it communicates with as well. Below are the top 6 causes of an ABS light coming on. 1) Low Brake Fluid The aim of this review was to study why, despite large investments in research and development, algae biodiesel is still not price competitive with fossil fuels. Microalgal production was confirmed to be a critical cost item (84 up to 93 %) for biodiesel regardless of the production technology. Techno-economic assessment revealed the main cost drivers during mass cultivation. It is argued that zCYb.