RR L320 Suspension fault

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Oct 10, 2023 | 12:17 PM

Steverob1983

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RR L320 Suspension fault

My RR was showing adaptive dynamics fault as soon as starting the Engine. Using an Autel Maxiap200 Identified that the rear left height sensor was faulty and replaced with a new one. Everything was great for a few days driving around town with no faults at all. As soon as I ventured out of town on bypasses, motorways, etc I was getting a suspension fault and max speed 30mph displayed and the suspension would drop right down to the bump stops. This seems to happen every time I take the RR above 40mph. Autel was showing fault code U0421-68 Invalid data received from ride level control module. After a quick Google saw many people were getting this after replacing a ride height sensor and cured with a suspension calibration. For some reason, my Autel would not let me enter into the option to calibrate suspension even though i have seen internet posts and videos of people doing suspension calibrations using the Autel. I found someone local who said he could do the suspension calibration for me and took the car to him. After about 10-15 minutes he informed me that he couldn't do the calibration but looking over his shoulder I noticed him using his tablet messing with settings and opening and closing valves and such. The dash was also displaying "suspension not in customer mode" which I have not seen before. Since he has messed with the RR its now sitting very low on the rear and still has the problem of dropping the suspension to the bump stops above 40mph but the fault code U0421-68 is no longer displayed and now shows C1A13-64 Gallery pressure does not decrease when venting instead. The RR raises to off-road height and drops back to standard height with no issues but displays a suspension fault when trying to go down to access height. I took it to a RR specialist and all he did was read the C1A13-64 fault code and told me i need a new Compressor at a cost of £500.

Sorry for the long-winded post but any help will be greatly appreciated as I am pulling my hair out at this point.