Indicator and speedometer issues in a 2010 Mazda BT-50
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Asked by Joe
Why does my 2010 Mazda BT-50 4WD indicator light come on and stay on, and my speedo sits on 40km/h when I am doing 100km/h?
Answered by CarsGuide
18 Jan 2024Modern vehicles have lots of electronics that operate functions such as the dashboard and warning lights. If the car is showing a 4WD light when it's not actually in 4WD, then there's an electrical glitch somewhere in the system.
But the fact that it occurs in tandem with a second fault (the incorrect speedo reading) makes us wonder if you're not looking at something as fundamental as a bad earth somewhere on the car. Electricity can't flow if the circuit isn't earthed, and this is a common source of problems like the one you're seeing. A good auto electrician should be able to sort both problems with simple test gear. If not, a scan of the vehicle's systems may throw up the answer.
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