Bank 2 cat efficiency on Volvo T6/B6 — XC60/XC90 inline-6 turbo cat aging or oil-burn from worn PCV.
Volvo P0430 — Bank 2 cat efficiency on Volvo T6/B6 — XC60/XC90 inline-6 turbo cat aging or oil-burn from worn PCV. Typical UK independent garage cost: £240–£1800.
What actually causes P0430 on a Volvo
Volvo T6 P0430 from 120k+ is normally a worn cat, but always rule out PCV oil-mist contaminating the rear brick. Bank 2 on the inline-6 is the cyl 4-6 cat. Volvo OEM cats are eye-watering; quality aftermarket E-marked alternatives last well.
Volvo engines that log P0430
- T6 3.0 turbo (XC90/S80)
- B6 mild-hybrid (XC60)
- D5 twin-turbo diesel
How we diagnose P0430 on a Volvo
- Read rear O2 switching live
- Check oil consumption pattern
- Inspect PCV diaphragm
- Smoke-test exhaust upstream
The common misdiagnosis to avoid
Don't fit a new cat without addressing PCV oil burn — the new cat will cook within 30k.
Volvo P0430 repair cost in the UK
Expect £240–£1800 including parts and labour at an independent garage. Main-dealer quotes on Volvo 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
Volvo T6 P0430 + heavy oil use = PCV first, then cat. Fix the cause.
Codes usually seen alongside P0430 on Volvo
- P0420
- P2096
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.