P0299 on BMW: Turbocharger or Supercharger Underboost
Severity: 2 of 4
Drive gently to a shop. Many vehicles go into reduced power mode, which can be unsafe when merging. If you see blue smoke, hear grinding from the turbo, or the oil warning comes on, park it, because turbo failure can damage the engine.
Estimate range covers the repairs listed below; see the cost breakdown. A flashing check engine light, a hot temperature gauge, or brakes that feel different mean stop driving and get help.
What P0299 usually means on a BMW
On 2007 to 2010 N54 twin turbo models, BMW extended coverage to 8 years or 82,000 miles for turbo failures caused by a wastegate defect. BMW says a slight rattle is normal; a repeated clank on deceleration is the documented complaint. Wastegate problems can contribute to underboost. Other BMW turbo engines more often set P0299 from boost leaks or charge pipe failures.
Most likely causes on BMW vehicles
- Charge pipe crack
- Boost leak
- Wastegate wear
- Boost control fault
- Turbocharger
Order reflects cost and likelihood in general; your vehicle may differ. Confirm with testing before buying parts.
BMW specific tips
- A slight rattle can be normal on N54 engines; a repeated clanking on deceleration is worth a dealer check.
- Plastic charge pipes on some models crack under boost.
Estimated repair cost
This is an estimate, built from typical parts price ranges plus labor hours times an assumed shop rate of $110 to $190 per hour. Actual prices vary by vehicle, region, and shop. Diagnosis fees are often extra.
| Repair | Parts | Labor | Estimate (low / high) |
|---|---|---|---|
| Intercooler hose or clamp | $20 to $200 | 0.5 to 2.0 h | $20 + 0.5 × $110 = $75 $200 + 2.0 × $190 = $580 |
| Boost control valve | $40 to $250 | 0.5 to 1.5 h | $40 + 0.5 × $110 = $95 $250 + 1.5 × $190 = $535 |
| Turbocharger | $600 to $2,500 | 3.0 to 8.0 h | $600 + 3.0 × $110 = $930 $2,500 + 8.0 × $190 = $4,020 |
Costs are generic for this code; parts and labor on some BMW models may run higher.
Watch a repair video
Search YouTube for “P0299 BMW fix” videos. Pick a recent video that matches your engine, and confirm the diagnosis before buying parts.
Repair manuals
Step-by-step service manuals for BMW with torque specs and wiring diagrams:
Haynes manuals for BMW Chilton manuals
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Check BMW recalls
Enter your VIN at the NHTSA recall lookup before paying for repairs.
FAQ
Are N54 turbos expensive to replace?
Yes, because labor is high on that engine.
Read the full P0299 guide or more BMW check engine notes.