Car · Problems

Loss of power and limp mode

The ECU deliberately limits power to protect the engine. It is a symptom, not a fault in itself: the stored fault code tells you what to fix.

UrgencyModerate
Can I drive?Yes, carefully
Likely causesSplit turbo hose

Likely causes

  1. Split turbo hose20%
  2. Clogged EGR valve20%
    Garage price: EGR valve £275 – £740
  3. Clogged particulate filter20%
    Garage price: DPF cleaning £200 – £455Garage price: Diesel particulate filter (DPF) £640 – £1,465
  4. Failing turbocharger15%

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

    Garage price: Turbocharger £730 – £1,780
  5. Dirty mass air flow sensor15%
    Garage price: Mass air flow sensor £90 – £255
  6. Dirty or faulty injector10%
    Garage price: Diesel injector £245 – £650

What you can check yourself

  1. Switch off for a minute and restart: if power returns, the fault is intermittent.
  2. Listen for a loud whoosh when accelerating: a turbo hose may have popped off.
  3. Read the codes with an OBD scanner, from around €20 online.

Fault codes often linked

P0106 Manifold absolute pressure sensor range or performanceP0236 Turbo boost sensor A range or performanceP0299 Turbocharger underboostP0400 Exhaust gas recirculation flowP0401 EGR flow insufficientP0402 EGR flow excessiveP0403 EGR control circuitP0404 EGR control circuit range or performance

Frequently asked questions

Loss of power and limp mode: what causes it?

Likely causes: split turbo hose (20%), clogged egr valve (20%), clogged particulate filter (20%).

Can I drive?

Yes, carefully. Urgency: moderate.

Indicative estimate. MecaScan cannot see your vehicle: always have a diagnosis confirmed by a professional, and never work on brakes, steering or airbags without the skills.