Direct Replacement Hitachi Air Suspension Compressor The air suspension fitted to Land Rover Discovery and Range Rover Sports is a fantastically capable system, but it isn't without its faults. Over time the compressors can wear and can cause faults with the vehicles suspension. The best option to repair these is with the correct OEM compressor, as fitted in the factory. This is a genuine Hitachi item, manufactured in Japan. This is supplied with a replacement relay that needs to be swapped at the same time as the compressor. As this is an OEM item there is no need to reprogram the ECU, although you may need access to a diagnostic computer to clear any stored fault codes. Later Range Rover Sports and Discovery 3 and 4 models use AMK compressors. This .
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