This LRO reader emailed LRO.firstname.lastname@example.org to ask our experts for help on his Range Rover P38's saggy rear end problem.
I fitted an air-suspension bypass system on my Range Rover P38 and it works well for about 24 hours – then the rear goes down again. The garage I’ve taken it to says the solenoids are working and they’re going to check the air suspension ECU; but would I be right in thinking that a bypass cuts out the need for the ECU, and that it’s more likely to be an air leak in the system?
The garage mechanic says he can’t find any leakage.
Dave Williams, Pontypool, Gwent
I’m as confident as I can be that, if the suspension drops, you have a leak. If only one end drops after more than six hours then the ECU has been bypassed completely, due to it self-levelling every six hours when inactive.
It’ll be in either one of the rear air springs – lift them to full height and check for perished rubber – or damaged air pipes. If you had a blowing exhaust, the pipes may have been damaged by the escaping heat. I don’t recommend bypass systems because the original kit works well when it’s in good order, and any fault is relatively easy to fix.
This workshop advice appeared in the September 2015 issue of LRO. Back issues are available to download on digital devices here.