Thermostat Housing
Engine Valve Cove
Intake Manifold
Expansion Tanks
Variable Valve Timing (VVT)

EGR Valve
Secondary Air Pump
Oil Cooler
Blower Resistor
Heater Valve
Throttle Body
Ignition Coil
Nitrogen Oxygen Sensor
Headlight Leveling Sensor
Oxygen Sensor
Temperature Sensor
Brake Light Switch
Fuel Pressure Regulator
Mass Air Flow Sensor
Oil Pressure Switch
ABS Sensor
Auxlliary 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.