Land Rover & Jaguar
OBD codes explained
The codes JLR owners actually see — misfires, EGR, catalysts and boost — with clear causes and fixes.
Land Rover / Jaguar check engine light codes
Land Rover and Jaguar (JLR) use standard OBD-II engine codes. Deep module diagnostics use SDD/Pathfinder tools, but engine codes are readable generically.
Here are the codes most reported on Range Rover, Discovery, Defender, Evoque and Jaguar models.
OBD-II code decoder
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Most common Land Rover / Jaguar
Classic JLR faults behind these codes.
| Code | Description |
|---|---|
| P0011 | "A" Camshaft Position Timing Over-Advanced (Bank 1) |
| P0101 | Mass Air Flow (MAF) Sensor Range/Performance |
| P0171 | System Too Lean (Bank 1) |
| P0234 | Turbocharger Overboost Condition |
| P0300 | Random/Multiple Cylinder Misfire |
| P0401 | EGR Flow Insufficient |
| P0420 | Catalyst System Efficiency Below Threshold (Bank 1) |
| P0442 | EVAP System Small Leak Detected |
Common Land Rover / Jaguar faults
Classic JLR faults behind these codes.
Lean mixture (P0171) — vacuum leaks, common on supercharged petrol engines.
Misfires (P0300) — coils and plugs, common across the range.
Catalyst efficiency (P0420) — aging converter.
EGR flow (P0401) — carbon buildup on diesel models.
Boost faults (P0234) — supercharger/turbo boost control on petrol and diesel.
Land Rover / Jaguar FAQ
Why does my Range Rover show P0171?
Is P0234 serious on a Land Rover?
Are Land Rover and Jaguar codes the same?
Can a cheap scanner read JLR codes?
What should I check first on a misfire?
Codes vary slightly by model, year and engine. Always confirm with a proper diagnosis. Manufacturer-specific codes (P1xxx/P2xxx) may differ from generic descriptions.
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