IsItAGoodCar
Reliability Guide

Common Problems with the
2003 Land Rover Discovery 2 (L318)

The 2003 facelift brought the Discovery 2's styling in line with the new Range Rover, featuring 'pocketed' headlamps and a much-improved, higher quality interior.

What changed for 2003

  • •Major exterior facelift featuring new headlights and bumpers.
  • •Significant improvements to interior refinement and equipment levels.

Common MOT watch-outs

  • !Failure of the 'Three Amigos' (ABS, TC, Hill Descent) warning lights, often due to an ABS shuttle valve fault.
  • !Continued vulnerability to rear chassis rot.
3
Known Issues
2
Serious
1
Moderate
0
Minor

All Known Issues

TD5 Injector Harness Oil Migration

SeriousEngine

Oil seeps along the injector wiring harness into the ECU red plug connector, causing rough running, misfires and potential ECU damage.

Est. Repair Cost: £100–£500
Warning Signs:

Rough idle, Misfires, Hard starting, Engine cutting out

What to Inspect:
  • Oil in ECU red plug
  • Injector harness condition
  • Injector seal condition
Verified by IsItAGoodCar Research Team

Air Suspension and ACE System Failures

SeriousSuspension & Chassis

Self-levelling suspension (SLS) air bags perish and compressors fail. The ACE system leaks from corroded pipes, causing handling issues and expensive repairs.

Est. Repair Cost: £400–£2,000
Warning Signs:

Vehicle sagging, ACE warning light, Fluid leaks underneath, Compressor running constantly

What to Inspect:
  • Air bag condition
  • ACE pipe condition
  • Compressor operation
  • Ride height sensors
Verified by IsItAGoodCar Research Team

Three Amigos (ABS/TC/ HDC Warnings)

ModerateElectrics & Electronics

The ABS, Traction Control, and Hill Descent Control warning lights illuminate together. Usually caused by ABS sensor failures but can indicate more expensive 4WD system issues.

Est. Repair Cost: £100–£800
Warning Signs:

Three warning lights on together, Loss of traction control, HDC inoperative

What to Inspect:
  • ABS sensor condition
  • Fault codes
  • Brake pedal switch
Verified by IsItAGoodCar Research Team

Buying Tips for 2003 Land Rover Discovery 2 (L318)

  • ✓If the 'Three Amigos' lights are illuminated, diagnosing the exact cause requires specific Land Rover diagnostic gear.
  • ✓Ensure the central locking operates all doors; actuator failure is very common.
1999–20022004
Check a 2003 Land Rover Discovery 2 (L318) by Registration