Land Rover P0430

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

1. Check VIN for AJ133 timing service position
2. Read O2 sensor switching both banks
3. Inspect cat externally for impact damage
4. 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.

Reading P0430 on a Land Rover properly

A generic reader will show P0430 and nothing else. What matters is the freeze-frame data stored with it — engine speed, load, coolant temperature and fuel trims at the moment the fault was logged — plus whether any other module on the Land Rover has logged something at the same time. Codes rarely arrive alone, and the order they were stored in usually points at which one is the cause and which are the consequences.

Clearing P0430 without fixing it

Erasing the code resets the Land Rover's readiness monitors as well as the light. The fault returns on the next drive cycle if the cause is still there, and in the meantime the incomplete monitors can stop the car passing an emissions check. After a genuine repair, the car is driven until the relevant monitor completes before it is handed back.

Bob's Mechanical Repairs is an independent garage in Birnam, Dunkeld, Perthshire, with 32 years of Bob's experience on the tools. If P0430 is showing on your Land Rover, bring any scan results with you — we will read the live data ourselves, confirm which cause it actually is, and price the repair before any work starts.