A loss of power in diesel cars is frustrating, especially when climbing hills or overtaking. The most common reasons are injector problems, fuel filter clogging, turbo issues, EGR valve faults, or a blocked DPF.

Possible Causes

• Dirty or faulty injectors
• Clogged fuel filter restricting flow
• Turbo leaks or damaged turbocharger
• EGR valve stuck open due to soot build-up
• Dirty air filter
• MAF (mass air flow) sensor failure
• Clogged diesel particulate filter (DPF)

Fixes

• Professional injector cleaning or replacement
• Change the fuel filter every 20–30k km
• Inspect turbo hoses for leaks, check turbo oiling
• Remove and clean the EGR valve
• Replace air filter if dirty
• Clean or replace MAF sensor
• Regenerate or clean DPF