EGR Valve
Secondary Air Pump
Thermostat Housing
Oil Cooler
Fuel Pressure Regulator
Blower Resistor
Heater Valve
Ignition Coil
Air Flow Sensor
Headlight Leveling Sensor
Lambda Sensor
Temperature Sensor
ABS sensor
Brake Light Switch
Oil Pressure Switch
Throttle Body
Auxiliary Water Pump

Headlight Leveling Sensor

What They Do
A height sensor lets the system know if the vehicle is at factory height. When extra weight is added, working together with the control module, the height sensor will let the compressor know it needs to turn on and fill the bags. If the height needs to drop the height sensor will let the system know to release air from the air spring bags or air shocks.

Failure Symptoms
Suspension amber light came on.