Bank 2 cat efficiency on Land Rover 5.0 V8 / 3.0 V6 supercharged — Range Rover/Range Rover Sport.
Land Rover P0430 — Bank 2 cat efficiency on Land Rover 5.0 V8 / 3.0 V6 supercharged — Range Rover/Range Rover Sport. Typical UK independent garage cost: £320–£3800.
What actually causes P0430 on a Land Rover
Range Rover V8 P0430 is normally a tired cat after 100k of stop-start city use, but the AJ133 V8 has a known timing-chain stretch story — P0017/P0008 alongside P0430 means address timing first or the new cats won't survive.
Land Rover engines that log P0430
- 5.0 V8 supercharged (Range Rover, Range Rover Sport)
- 3.0 V6 supercharged
How we diagnose P0430 on a Land Rover
- Check VIN for AJ133 timing service position
- Read O2 sensor switching both banks
- Inspect cat externally for impact damage
- Smoke-test upstream
The common misdiagnosis to avoid
Quoting cats without checking timing chain on AJ133 is how customers end up with a £4k bill that fails again — chain first, always.
Land Rover P0430 repair cost in the UK
Expect £320–£3800 including parts and labour at an independent garage. Main-dealer quotes on Land Rover are usually higher for the same job, and the spread exists because the cheap cause and the expensive cause throw the same code — pay for the diagnosis before you pay for parts.
Bob's workshop tip
Range Rover 5.0 P0430 with any chain rattle = stop. Timing kit before cats, every time.
Codes usually seen alongside P0430 on Land Rover
- P0420
- P0017
Symptoms drivers report with P0430
- MIL comes on after a motorway run then stays lit — no drivability change
- Slight sulphur/rotten-egg smell on hard acceleration
- MPG drop of 1–3 mpg you wouldn't notice unless you track it
- Fails emissions/lambda snapshot at MOT despite passing tailpipe CO
- Bank 2 short-term fuel trim slightly richer than bank 1 at cruise
Repairs that clear P0430
- Same diagnostic as P0420 but bank 2 side
- Replace bank 2 rear lambda first as trial
- Confirm with lambda graphing before cat replacement
For the generic, all-makes explanation of this code — meaning, every known cause and UK cost bands — see our P0430 guide.