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 O/D LIGHT TURNING ON AND OFF  OVER DRIVE LIGHT ISSUE IN MY CAR What Does O/D Off Light Mean? Vehicles with Automatic transmission  have the Overdrive (O/D) function which allows a driver to drive faster or with high speed on the road. Out of all the gears the o/d is the highest gear in an automatic transmission. The overdrive function reduces the engine’s revolutions per minute (RPM) down to a certain speed to aid in acceleration and make the vehicle more fuel-efficient. Many car drivers often mistake the o/d off state when the light is off, but the opposite is when its indicator light is on. Let’s find out the difference between when the overdrive function light is on or not and its meaning. What Does O/D Off Mean In A Car? Now understand this first. The o/d signifies the top gear or gears in a car’s transmission. The o/d off button allows you to prevent an automatic message from shifting into those top gears in certain situations, such as when driving through rough hil...

Speedometer And Odometer Not Working my 2004 Nissan maxima 3.5 SE speedometer and odometer stopping working...Every thing else on the cluster still works  I went to auto zone and there scanner tool said P1574 Solution for this problem: This is your Vehicle speed sensor , with both not working to tells me the speedometer ? cluster is okay . The code also indicated the VSS . Replace the sensor and it will start to work again / Which one of the trans speed sensors did you replace . Okay there are three sensors output input and vehicle speed sensor . Was this the one replaced if not replace this sensor .  this is back near the engine ,looks like you replaced the turbine speed sensor . The one you need to replace is the sensor marked with a red oval ring