Warning Light On
DPF light, engine-management light, emissions warning, AdBlue/SCR message or glow-plug light linked to a diesel emissions fault.
Checker first
Not sure yet? Use the DPF Health Checker.
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.
- 01
Answer The Symptoms
No technical knowledge needed. It guides you through the common DPF warning signs.
- 02
Get A Sensible Direction
Useful if you are unsure whether it needs a clean, diagnosis, repair or urgent attention.
- 03
Book With Confidence
If the checker points to assessment, you know why you are booking before you arrive.
Book this if
The vehicle needs evidence before another clean or forced regeneration.
If the health checker points this way, or any of these sound familiar, a proper DPF assessment is the sensible next step.
Limp Mode
Reduced power, failed regeneration, high soot-load message, fan running after switch-off or a vehicle that will not complete a regen.
Blocked Again
The DPF has already been cleaned, forced-regenerated or replaced, but the same problem keeps coming back.
What we check
Find the reason before selling the clean.
The aim is to understand why the warning appeared, not simply force a clean and hope it stays away.
Fault Codes
DPF, EGR, boost, fuelling, pressure-sensor, temperature-sensor, AdBlue/SCR and NOx-related faults are reviewed where the vehicle supports them.
Live Data
Differential pressure, soot load, ash estimates, temperature values and regeneration information help decide whether cleaning is suitable.
Root Cause
Exhaust leaks, sensor faults, failed regeneration, short-trip use, boost issues and fuelling problems can all make a DPF block again.
What you leave with
A practical recommendation, not a guesswork sales pitch.
You should not be left wondering whether to clean it, replace it, ignore it or sell the car. The assessment gives direction.
A Practical Recommendation
We explain whether the data points toward on-car cleaning, off-car cleaning, related repair, further diagnosis or no clean at all.
No Guesswork Sales Pitch
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.
Separate Service Pricing
All DPF work begins with a professional diagnostic assessment to identify the underlying cause of the fault. Our DPF Assessment costs £120, with any cleaning or repair work quoted separately. We diagnose the problem before recommending a solution. DPF Diagnostic Assessment: £120. On-Car DPF Cleaning: £249. Off-Car DPF Cleaning: £199. All services are charged separately. No automatic discounts or deductions apply.
Possible outcomes
The correct answer may be cleaning, repair, further diagnosis or no clean.
No Clean Recommended
No clean is recommended if the data does not support it.
On-Car Cleaning
On-car DPF cleaning from £249 where the filter and fault pattern are suitable.
Off-Car Refurbishment
Off-car cleaning or refurbishment from £199 for removed filters.
Repair First
Sensor, boost, EGR, AdBlue/SCR, exhaust or fuelling faults may need repair before cleaning makes sense.
Why it matters
A DPF can block because the car is protecting itself from another fault.
Cleaning the filter without finding that fault can put you straight back at the same warning light.
Before Spending More
A £120 assessment can stop you jumping straight to a clean, sensor, DPF replacement or repeated forced regen that was never going to last.
Before MOT Stress
Emissions faults, failed regens and limp mode rarely fix themselves. Early assessment gives you a controlled plan before the vehicle becomes urgent.
Before It Gets Worse
Continuing to drive with high soot load or unresolved faults can increase downtime and limit the repair options available later.
Important: PPG does not promote DPF removal for road vehicles. A clean cannot repair a cracked, melted, missing or severely damaged substrate, and related mechanical or emissions faults may require separate repair. The assessment does not guarantee that every root cause can be confirmed within one visit, but it gives a proper evidence-led basis for the next decision.
FAQs
DPF Assessment FAQs
How much is a DPF assessment?
The DPF assessment is £120. It is designed to check the evidence before cleaning, parts replacement or further work is recommended.
Should I use the free DPF checker first?
Yes, if you are unsure. The checker helps triage warning lights, limp mode, previous cleans and driving pattern before you book.
Does the assessment include DPF cleaning?
No. The assessment decides whether cleaning is suitable. On-car cleaning and off-car cleaning are separate routes when the data supports them.
Will a DPF clean fix every warning light?
No. A clean cannot repair sensor faults, boost faults, EGR issues, AdBlue/SCR problems, exhaust leaks or a damaged filter substrate.
What happens if cleaning is not recommended?
We explain the evidence and recommend the next sensible step, which may be repair, further diagnosis, monitoring or no clean.
Are assessment and cleaning charged separately?
All DPF work begins with a professional diagnostic assessment to identify the underlying cause of the fault. Our DPF Assessment costs £120, with any cleaning or repair work quoted separately. We diagnose the problem before recommending a solution. DPF Diagnostic Assessment: £120. On-Car DPF Cleaning: £249. Off-Car DPF Cleaning: £199. All services are charged separately. No automatic discounts or deductions apply.
Book the right first step
DPF light on or blocking again?
Use the checker for guidance, then book the £120 assessment if it points that way. Prestige Performance Group Ltd, 36A Donaghadee Road, Newtownards, BT23 7EU.
Assessment First. Diagnose Properly. Fix It Right.