Range Rover L322 air suspension repair — sagging corner fixed — Milton Keynes

Signs your air suspension needs looking at

• Sits low on one corner after standing overnight^[13]
• Drops onto the bump stops with a suspension warning, and the car limits its speed^[14]
• The compressor runs for a long time, or cuts out hot and the car sinks^{[8, 14]}
• Will only go back to standard height and will not change height after that^[10]
• Stays down at access height and does not lift back to standard once you drive off^[8]
• A hiss from one corner, louder at off-road height^[14]
• Water in the spare wheel well, where the compressor lives^{[3, 12]}

Which cars

Range Rover (L322)2002–2012 model years

Four-wheel independent air suspension with four ride heights: standard, off-road, motorway and access^{[1, 7]}

What goes wrong, part by part

The L322’s system, as Land Rover’s workshop manual lists it, and how each part fails.

Front struts (air springs)One each side, with the air spring built into the strut

The rubber spring and its seals perish and leak; a failed lower seal is a known cause of a front corner sagging overnight.^{[2, 12, 13]}

Rear air springsOne each side at the rear

Pinholes and perished rubber, so the corner slowly loses air.^{[2, 12]}

Air supply unit (compressor and dryer)Electric piston compressor with an air dryer, sealed in the spare wheel well

Wears until it cannot fill the reservoir or springs; a leak elsewhere makes it run too long and overheat, and the ECU then stops it; the dryer can crack.^{[3, 4, 8, 12, 14]}

Valve block, reservoir and pressure sensorThe reservoir stores air; the valve block sends it to each corner

Leaks at the valve block and its pipe connections — part of Land Rover's own leak check.^{[2, 6]}

Cross-link valvesJoin the left and right springs at low speed for more articulation off-road

Leaks at their connections; a cross-link valve fault is one the ECU logs.^{[5, 6, 10]}

Air pipes and fittingsCarry air between the compressor, reservoir, valve block and springs

Perish or rub through, and leak at the joints.^{[2, 12, 14]}

Height sensorsFour, one per corner, telling the ECU how high each corner sits

Usually a plug, wiring, fixing, linkage or calibration fault rather than the sensor itself — Land Rover says don't replace one with no fault code.^{[2, 11]}

Worth knowing

• Find the leak before buying parts. Land Rover's own manual says a leak that is not properly found means good parts get replaced and the problem comes back.^[6]
• A leak kills compressors. A spring or pipe losing air makes the compressor run until it overheats, so the leak is fixed first or a new compressor goes the same way.^{[8, 12, 14]}
• Not every "won't change height" is a fault: the car will not change height or level itself with any door open.^[9]
• Early cars (before VIN 106310) need a suspension ECU software update when the compressor is replaced.^[12]
• The electronics changed for 2005 on (Ford/Jaguar-based instead of BMW-based), so we confirm parts and software by your VIN.^[1]

What we do

1. 1.Repair the air suspension on the L322 and L405 Range Rover, the Range Rover Sport L320 and the Discovery 3 and 4
2. 2.Read the suspension fault codes and live data, including what each height sensor is reporting
3. 3.Raise the car and leak-test the whole system — every spring, pipe joint, the valve block and the reservoir — before anything is ordered
4. 4.Test the compressor: how long it takes to fill, and whether it is cutting out hot
5. 5.Check a height sensor's wiring, plug and linkage before blaming the sensor
6. 6.Replace only the part that failed, then check the car rises, lowers and stays level at every height
7. 7.Calibrate the ride height when the repair needs it, and road test before handover

You get the price for the repair before we start. More on these cars on our Land Rover and Jaguar page.