OBD · Air intake and boost

P0299 Turbocharger underboost

Fix soon

What this code means

P0299 is a generic OBD code shared by all manufacturers since 2001 for petrol and 2004 for diesel. It relates to: air intake and boost. The code tells you what the ECU measured as abnormal, not necessarily which part to replace.

Severity: Fix soon. Drive gently and as little as possible. The fault can get worse and damage other parts.

Most common causes

  1. Split turbo hose#1
  2. Failing turbocharger#2

    A whistle rising with revs, blue smoke and power loss are the classic trio of a dying turbo.

    Garage price: Turbocharger £730 – £1,780
  3. Clogged EGR valve#3
    Garage price: EGR valve £275 – £740

Cost of related repairs

Independent garageMain dealer
Turbocharger£730 – £1,780£935 – £2,635
EGR valve£275 – £740£360 – £1,145

How to read this code

An OBD scanner plugged into the 16-pin socket under the steering wheel reads and clears codes. Bluetooth models cost £20 to £40. Clearing a code without fixing the fault is pointless: it comes back.

Related problems

Car judders when acceleratingLoss of power and limp modeWhite smoke from exhaustBlack smoke when acceleratingBlue smoke from exhaustRough or unstable idle

Frequently asked questions

What does code P0299 mean?

P0299: Turbocharger underboost. P0299 is a generic OBD code shared by all manufacturers since 2001 for petrol and 2004 for diesel. It relates to: air intake and boost. The code tells you what the ECU measured as abnormal, not necessarily which part to replace.

Can I drive with code P0299?

Fix soon. Drive gently and as little as possible. The fault can get worse and damage other parts.

How much does it cost to fix P0299?

Turbocharger: £730 – £1,780, EGR valve: £275 – £740.

How to read this code

An OBD scanner plugged into the 16-pin socket under the steering wheel reads and clears codes. Bluetooth models cost £20 to £40. Clearing a code without fixing the fault is pointless: it comes back.