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check out the attached wiring diagram. HSHL+/HSHL/HSHL- (left), HSHR+/HSHR/HSHR- (right) are the sensor outputs for high, normal and low ride height for either side. there's obviously also a supply voltage going into the sensors as well. see if the supply voltage even gets to the sensors, your problem could be something as simple as a broken wire. measure supply voltage on both sides, get a reference value, see if it's the same both sides. ideally you should plug into the OBD to monitor I/O activity and see what, if any, signal arrives at the control module.
alternatively, find a car breaker and see if you can grab an identical tried and tested replacement sensor and swap your sensors, see if the problem persists.
i'm presuming you checked the solenoid valves that are part of the compressor assy, to see if the compressor, while it works, actually delivers air where it needs to be or if the pressure release valve might be seized. it's a simple enough system with a fair amount of things that can go wrong.
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discs 'n drums 'n body roll
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