Turbo underboost on Nissan — 1.5 dCi (shared with Renault) suffers turbo oil starvation. 1.6 dCi has known turbo failures.
Nissan P0299 — Turbo underboost on Nissan — 1.5 dCi (shared with Renault) suffers turbo oil starvation. 1.6 dCi has known turbo failures. Typical UK independent garage cost: £400–£1800.
What actually causes P0299 on a Nissan
The 1.5 dCi turbo (shared with Renault) is starved of oil by a known issue with the banjo bolt strainer clogging up — turbo bearing wear follows and you get P0299 with limp mode. Always replace the turbo oil feed pipe AND fit a new banjo bolt strainer with any turbo work on these.
Nissan engines that log P0299
- 1.5 dCi (Note, Juke, Qashqai, Micra)
- 1.6 dCi (Qashqai, X-Trail)
- 1.2 DiG-T (Juke, Pulsar, Qashqai)
How we diagnose P0299 on a Nissan
- Smoke-test boost system from turbo outlet to intake
- Check for any oil leak around turbo (bearing seal failure indicator)
- Inspect oil feed pipe condition — replace with new
- Confirm engine oil change schedule has been kept (5,000 mile max on these)
The common misdiagnosis to avoid
Fitting a new turbo to a 1.5 dCi without replacing the oil feed pipe and strainer = new turbo destroyed inside 30,000 miles. The strainer is £15. Always fit it.
Nissan P0299 repair cost in the UK
Expect £400–£1800 including parts and labour at an independent garage. Main-dealer quotes on Nissan 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
Used 1.5 dCi turbos are abundant cheap but rarely worth fitting — the failure rate of secondhand units is sky-high. Pay £350–£500 for a quality remanufactured unit with new core.
Codes usually seen alongside P0299 on Nissan
- P0234
- P2263
- P132B
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.