Turbo underboost on Peugeot HDi and PureTech — VGT actuator carbon-up on diesels, wastegate solenoid on PureTech petrol.
Peugeot P0299 — Turbo underboost on Peugeot HDi and PureTech — VGT actuator carbon-up on diesels, wastegate solenoid on PureTech petrol. Typical UK independent garage cost: £160–£1500.
What actually causes P0299 on a Peugeot
On Peugeot 1.6 HDi (PSA DV6, shared with Ford/Mini/Citroën), P0299 is almost always a sticky VGT (variable geometry turbo) actuator — the vanes carbon-up and the actuator rod can't sweep the full range. On the 1.2 PureTech turbo, the wastegate solenoid is the typical failure point. The 1.6 THP shares causes with the Mini Prince engine (PCV and chain wear).
Peugeot engines that log P0299
- 1.6 HDi DV6 (208, 308, 3008, Partner)
- 2.0 HDi DW10 (308, 508, 5008)
- 1.2 PureTech turbo (208, 2008, 308)
- 1.6 THP (208 GTI, 308 GTI)
How we diagnose P0299 on a Peugeot
- Smoke-test the intake from turbo to inlet manifold for splits
- Scan tool: log commanded vs actual boost during a 4th-gear pull
- Remove and inspect EGR valve and intake manifold for carbon (>50% restriction = clean)
- Strip and clean VGT actuator on 1.6 HDi (Garrett GT15) before condemning turbo
- Test wastegate solenoid on PureTech turbo via actuator function
The common misdiagnosis to avoid
Don't let a garage quote you for a complete turbo on a 1.6 HDi when an EGR/intake clean and a VGT actuator strip-and-clean (£280) cures most cases.
Peugeot P0299 repair cost in the UK
Expect £160–£1500 including parts and labour at an independent garage. Main-dealer quotes on Peugeot 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
If a customer's 1.6 HDi has done short urban journeys for years, expect heavy EGR/intake carbon — an Italian tune-up after the clean (motorway blast in 4th at 3000 rpm for 20 minutes) helps the new VGT bed in.
Codes usually seen alongside P0299 on Peugeot
- P0234
- P132B
- P2263
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.