Faulty Landrover Discovery Suspension

[Kayvoh87]

I own a Land Rover Discovery 4, which I took to a local dealership for wheel alignment before a countryside trip. The technician noticed it was leaning more to the left, and I suspected the air suspension might be deflated. After inflating the air strut, an error message appeared on the dash stating "Suspension inflating slowly." Deciding to take a different vehicle, I began driving the Discovery home, but the suspension fully deflated during the trip, leaving the car flat on the road. I managed to raise it to off-road mode and left it in that setting for three days.

Upon returning, I scanned for error codes and found:

- **C1A04-78**: Front right height sensor (Intermittent)
- **C1A07-62**: Cross articulation (Intermittent)
- **C112F-72**: Air spring valve (Intermittent)

I inspected the front left air strut for leaks using soapy water but found none, and the hose and valve connections appeared fine. After deflating the air strut to see if it would reinflate, the suspension failed to restore normal height, even in off-road mode. Further diagnostics revealed the following permanent error codes, and the system continues to display a "Suspension Fault":

- **C1A04-78**: Front right height sensor (Permanent)
- **U3000-53**: Control module (Permanent)
- **U3000-55**: Control module (Permanent)

Any insights on how to resolve this suspension issue?

 

[itsaguything]

he buggered the ride height sensor??

 

[ftillier]

Do you have lift rods installed? On bump stops you might be outside the normal range of motion for the height sensors.

 

[itsaguything]

Or the front valve block is toast?
How exactly was the air spring inflated?

 

[Kayvoh87]

Or the front valve block is toast?
How exactly was the air spring inflated?

I have an SDD connected to the vehicle via a Mongoose cable. The front right height sensor has a permanent error. See the attached photo.