Ok so I’m about to purchase a 2006 Land Rover HSE with 213k miles on it. Picking it up for about 3k. The body and interior are immaculate and maintenance is up to date. The only issue is the air suspension has bottomed out and won’t air up. The owner said that he messed it up and doesn’t know how to fix it.

here is his text message: “I had the scanner hooked up and I deflated the shocks so I can replace the ride height Sensors then I recalibrate it at the lowest form by accident and have had zero luck since then”

So is the suspension not airing up do to calibration error or is something else the problem. Bags and compressor were replaced within the last year. Compressor is completely silent. Tried to search it but this case seems kinda unique.

 

It can be anything. You need to determine what it is.

First, you need to read the codes with a reader, preferably LR specific not with a generic one.

Compressor starts normally if it detects the reservoir needs filling (among other things). If it doesn’t start it is either dead, or you have a bad relay, or a bad fuse, etc.

It isn’t a good idea to drive the vehicle very long distances if it is on its bump stops.

Calibration can be done for sure with an IID, I imagine it can be done with some other readers too.

 

Sometimes jacking the vehicle up to normal height will get the sensors back in range and then the system will start to work, maybe a hard reset while your at it. Unless he used a quality scanner i doubt he could have changed much as most cheap units aren't capable of editing the settings.

 

Agree with loanrangie. I have changed my suspension pump 4 times over the years. When you release all of the air in the system, you cant reinflate the airshocks without an IDII. A simple workaround is to start the truck up and jack up both the back and front of the truck, This will cause the car to re-inflate your shocks.

 

I have replaced struts, never an issue with the system coming up from bumps. Unless some fool decided to put sensor rods on which push the sensors out of range.

 

Alright so I purchased the vehicle. I scanned it with a generic scanner and I have a code for all 4 height sensors. I’m assuming this is due to them being out of range/calibration. And one more code for control module C1 A00-54 is this a code for calibration? I have just ordered a GAP tool. It hasn’t came yet but that’s as much diagnosing as my generic scanner can get right now.

 

I guess someone has tried to calibrate it. Do assisted calibration with IID, once you get it, when done do set the vehicle to normal tolerance mode.

 

Sensors can only be out of range if aftermarket sensor rods are installed. And yes, the fault missing missing calibration OR it means you are in build/tight tolerance mode. With the GAP you just have to go in and set normal tolerance to see if that was the issue.

 

Aftermarket rods? Would that be Johnson rods to lift the ride height? I don’t have a GAP tool just yet since it’s on order. I’m getting a permanent code for all 4 corners C1 A72-1 C, C1 A73-1C, C1 A74-1C, and C1 A75-1C. Are these faults due to the vehicle sitting on the bump stops?

 

Johnson rods is one of the brands, yes. And no, sitting on bump stops would not cause faults - unless there are aftermarket rods installed. You can always try jacking it up, both front and back a bit and see what happens. But not too high.