A1 Cardone 4J-1000C Air Suspension Compressor Air suspension products are guaranteed to fit and function like the original, at a fraction of the typical market price Extensive performance testing, including inflation time, electrical current and solenoid operation is done on every unit to ensure reliable, consistent performance Air driers are included for your convenience, typically sold separately by other manufacturers Guaranteed fit and function Meets or exceeds O.E.M performance Clean surrounding area to prevent dirt from entering the system Replace air compressor filter, where applicable System-related error message displayed on the driver information center System-related diagnostic trouble codes stored Vehicle ride height lower than normal Rear of vehicle will not raise under a heavy payload Excessive noise from compressor, when engaged Excess moisture in the system can cause the compressor to fail. A relay control stuck in the closed position or an air leak in any part of the system can cause the air suspension strut to run continuously and fail over time. A scan tool capable of communicating with the air suspension control module will be necessary to release air from the system for repair and it can also be used to do a functional test for validation of the replacement compressor, once installed.