Will a code reader shut off a wheel sensor light? – Hugh
Most do-it-yourself car enthusiasts own a code reader. Widely available, they have become a must-have for anyone who wants to get involved with maintaining their own vehicle – but the simple answer is no, it won't shut off a wheel sensor light. For that, a proper scan tool is required. Code readers are cheap devices – usually in the $50 range – designed for simple read-and-reset of the main engine powertrain control module (PCM). Unfortunately, the anti-lock brake (ABS) wheel sensor data is sent to the ABS brake module and your code reader cannot access that module. A proper scan tool jumps up in price, starting at about $300, and will access multiple modules including the PCM, ABS and other chassis and body modules.
Spending $300 on an entry-level scan tool may give you the ability to reset and temporarily turn off the ABS light, but chances are it will reappear shortly after reset.
A common failure within many ABS systems is for one of the four wheel speed sensors and/or their corresponding electrical connectors to corrode and cause an increased resistance at that wheel sensor. Three wheel sensors will report a fixed constant speed while the problematic sensor will report a slower speed due to the increased resistance. The ABS module will flag this as a problem and turn your ABS light on, storing a fault for that one sensor.
Lou Trottier is owner-operator of All About Imports in Mississauga. Have a question about maintenance and repair? E-mail globedrive@globeandmail.com, placing "Lou's Garage" in the subject area.
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