P0299 — Turbocharger is not producing enough boost pressure

The engine’s turbocharger is not generating the expected boost pressure, causing reduced power and efficiency. This can happen due to leaks, faulty wastegate, or sensor issues. The car’s computer detects that the turbo isn’t working as it should, which triggers the code.

Common causes

The cause is almost always one of a few things. Here they are — P0299 rarely comes from anything outside this list:

• Boost leaks in hoses or intercooler pipes
• Faulty turbo wastegate or actuator
• Malfunctioning boost pressure sensor
• Clogged or damaged turbocharger
• Exhaust leaks affecting turbo performance

Where to start

In the order a sensible mechanic would work — the cheap checks first, the expensive replacements only after:

1. Inspect and repair any boost leaks in hoses or pipes
2. Test and replace faulty boost pressure sensor
3. Check wastegate operation and replace actuator if needed
4. Clean or repair turbocharger if clogged or damaged
5. Inspect exhaust system for leaks affecting turbo

That is what holds for P0299 in general. From here it depends on your engine — tell me which car it is and what it does, and I will give you the steps for it: real procedures, torque figures and diagrams instead of general advice.