Why is my car losing power?
Loss of engine power — particularly sudden or accompanied by the engine management light — often means the car has entered "limp mode," a protective state where the ECU limits power to prevent damage. This requires a diagnostic scan to read the fault code. Gradual power loss over time is often fuel, air, or exhaust related — clogged fuel filter, failing fuel pump, blocked DPF, or boost leak on turbocharged engines.
Likely causes
Limp mode (ECU fault protection)
Sudden power cut often with EML — diagnostic scan needed to read the triggering fault code
Blocked DPF (diesel)
Severe DPF blockage prevents exhaust flow — major power loss on diesel vehicles
Turbo fault or boost leak
Whistling noise may accompany power loss on turbocharged engines
Clogged fuel filter
Restricts fuel delivery — worsens under high load
Catalytic converter blocked
Severe blockage restricts exhaust flow — feel the back pressure
Repairs you may need
Typical cost range: £40–£1200 — Diagnostic: £40–80. DPF clean: £80–200. Fuel filter: £50–150. Turbo: £500–1,500. Catalytic converter: £250–900.
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