Turbo underboost on Renault — 1.5 dCi K9K and 1.6 dCi R9M commonly suffer turbo oil starvation and actuator failure.
Renault P0299 — Turbo underboost on Renault — 1.5 dCi K9K and 1.6 dCi R9M commonly suffer turbo oil starvation and actuator failure. Typical UK independent garage cost: £250–£1800.
What actually causes P0299 on a Renault
Renault 1.5 dCi K9K is notorious for turbo failures caused by oil feed pipe blockage and short-trip use — the turbo bearings cook, then the VGT sticks. Always replace the oil feed pipe (£30–£50 part) when fitting any new or rebuilt turbo on these engines or it will fail again within 12 months.
Renault engines that log P0299
- 1.5 dCi K9K (Clio, Megane, Captur, Kadjar)
- 1.6 dCi R9M (Megane, Scenic, Kadjar)
- 1.2 TCe (Clio, Captur)
How we diagnose P0299 on a Renault
- Inspect oil feed pipe for restriction (cut it open if removed — common to find solid carbon)
- Smoke-test boost system
- Test VGT actuator sweep
- Reduce oil change interval to 7,500 miles for UK short-trip use
The common misdiagnosis to avoid
Never fit a replacement turbo on K9K / R9M without also replacing the oil feed pipe — Renault dealers and indies both make this mistake regularly.
Renault P0299 repair cost in the UK
Expect £250–£1800 including parts and labour at an independent garage. Main-dealer quotes on Renault 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
On any Renault 1.5 dCi with P0299 plus more than 100,000 miles, plan for the full turbo + oil feed pipe + oil change package — about £900–£1,400 at a Renault specialist. Half-measures fail.
Codes usually seen alongside P0299 on Renault
- P132B
- P0234
Symptoms drivers report with P0299
- Loss of power above 2,000–2,500 RPM — car feels flat overtaking on the motorway
- Limp mode kicks in at 3,000 RPM, resets after a key cycle, then returns within 10 miles
- Whistling from engine bay under load — split intercooler pipe or Y-piece
- Black smoke or fuel smell from the exhaust on diesels — VNT stuck open, over-fuelling
- Paired codes: P0234 (overboost, VNT stuck closed), P0299 with P0401 (EGR + boost overlap), P0299 with P132B (turbo boost control)
Repairs that clear P0299
- Smoke-test the boost system first (cheap and finds most causes)
- Clean VNT vanes with rocker-arm actuation
- Replace boost sensor
- Replace turbo as last resort
For the generic, all-makes explanation of this code — meaning, every known cause and UK cost bands — see our P0299 guide.