Where is the switch on a car horn? The basic idea is that some type of switch, usually located somewhere in the steering wheel, activates an electric horn. Some vehicles have a single horn, and others use two horns that each operate in a different frequency range. In a typical car horn circuit, the switch or button the driver pushes is connected to a relay. What causes a car horn to stop working? Potential issues here include a broken horn switch that can no longer activate the relay, a broken relay that can no longer send power to the horn,...

How has fuel efficiency changed over time? Figure ES-1. Fuel economy decreased by 0.2 miles per gallon to 24.9 mpg, or slightly below the record high achieved in model year 2018. Since 2004, CO2 emissions have decreased 23%, or 105 g/mi, and fuel economy has increased 29%, or 5.6 mpg. Does fuel economy go down over time? As car's age, fuel economy declines. It's also true your gas mileage changes over the period of the day as well. Colder mornings mean lower fuel economies. In fact, at 20-degrees your fuel economy is 12% lower than at 77-degrees. When did the...

What code is P2122? A P2122 code means that the the car's computer has detected that the TPS (throttle position sensor) is reporting too low a voltage. On some vehicles that lower limit is 0.17 - 0.20 volts (V). The "D" refers to a particular circuit, sensor, or area of a particular circuit. What can cause a P2121 code? What causes the P2121 code?Defective throttle actuator control motor.Defective throttle position actuator.Defective throttle position sensor or pedal position sensor.Corroded, open or shorted wiring or connectors in throttle actuator motor or Controller Area Network (CAN) bus harness.Loose control module ground strap. What...