Warning Light On
DPF light, engine-management light, emissions warning, AdBlue/SCR message or glow-plug light linked to a diesel emissions fault.
A blocked DPF is usually a symptom, not the full problem. Start with the free DPF Health Checker if you are unsure what your warning light means, then book the £120 assessment when the symptoms point to a fault that needs proper diagnostic evidence before cleaning, sensors, parts or guesswork.
The checker is the easiest first step for customers. It asks about warning lights, limp mode, driving pattern, previous cleans and symptoms, then points you toward the right next move: monitor it, book an assessment, consider cleaning, or get a fault investigated first.
If the health checker points this way, or any of these sound familiar, the vehicle needs a proper assessment before another forced regeneration or cleaning attempt.
DPF light, engine-management light, emissions warning, AdBlue/SCR message or glow-plug light linked to a diesel emissions fault.
Reduced power, failed regeneration, high soot-load message, fan running after switch-off or a vehicle that will not complete a regen.
The DPF has already been cleaned, forced-regenerated or replaced, but the same problem keeps coming back.
The aim is to understand why the warning appeared, not simply force a clean and hope it stays away.
DPF, EGR, boost, fuelling, pressure-sensor, temperature-sensor, AdBlue/SCR and NOx-related faults are reviewed where the vehicle supports them.
Differential pressure, soot load, ash estimates, temperature values and regeneration information help decide whether cleaning is suitable.
Exhaust leaks, sensor faults, failed regeneration, short-trip use, boost issues and fuelling problems can all make a DPF block again.
You should not be left wondering whether to clean it, replace it, ignore it or sell the car. The assessment gives direction.
We explain whether the data points toward on-car cleaning, off-car cleaning, related repair, further diagnosis or no clean at all.
If a clean is unlikely to solve the issue, we will say so. The point of the assessment is to protect you from paying for the wrong fix.
The correct recommendation may be no clean, on-car cleaning, off-car cleaning, repair or further diagnosis.
A DPF can block because the car is trying to protect itself from a fault somewhere else. Cleaning the filter without finding that fault can put you straight back at the same warning light.
A £120 assessment can stop you jumping straight to a clean, sensor, DPF replacement or repeated forced regen that was never going to last.
Emissions faults, failed regens and limp mode rarely fix themselves. Early assessment gives you a controlled plan before the vehicle becomes urgent.
Continuing to drive with high soot load or unresolved faults can increase downtime and limit the repair options available later.
DPF light on or blocking again? Use the checker for guidance, then book the assessment if it points that way.
Start Free Health Check Book DPF AssessmentA carbon clean can help the right vehicle, but warning lights, limp mode, smoke or DPF faults should be diagnosed first. PPG checks the cause before recommending cleaning.