DPF Diagnostics & Cleaning in Sunbury-on-Thames
A diesel particulate filter traps soot and burns it off through regeneration. When regeneration doesn’t happen often enough, or something upstream produces excess soot, the filter blocks and a warning appears.
We diagnose why the DPF is loading, clean or regenerate it where appropriate, and fix the underlying cause so the problem doesn’t simply return.
Common signs
Symptoms worth checking
- DPF warning light
- Loss of power or limp mode
- Frequent regenerations (fans running after switch-off)
- Rising oil level from post-injection dilution
Why DPFs block
Short journeys prevent passive regeneration. Faulty pressure sensors, temperature sensors, injectors, EGR faults or turbo oil consumption can all overload the filter.
Forced regeneration or cleaning can clear soot, but if the cause isn’t fixed, it will block again.
What we check
- Soot and ash load data
- Differential pressure sensor
- Exhaust temperature sensors
- EGR and injectors
- Oil level and condition
What we can do
- DPF diagnostics
- Forced regeneration
- DPF cleaning
- Sensor and component repair
How it works
The process
- 01
Scan and review DPF data.
- 02
Find the root cause.
- 03
Regenerate or clean.
- 04
Repair cause and verify.
Why The Factory
Main-dealer capability, independent service
A Master Technician-led workshop with seven mechanical ramps, a dedicated MOT ramp and dealer-level diagnostics. Faults are shown to you and additional work is quoted before it goes ahead.
We stand behind the work we carry out. Parts and workmanship are covered in accordance with your statutory rights and any applicable manufacturer or supplier warranty. Please ask us for details relevant to your repair.
- Dealer-level diagnostics
- Emissions system experience including JLR
Free local collection & return
Available by arrangement within approximately five miles of our Sunbury-on-Thames workshop. Further afield? Just ask us.
FAQs
DPF Diagnostics & Cleaning: your questions answered
Why has my DPF warning light come on?
The filter is loaded with soot and needs regeneration, or a sensor or related fault is preventing it.
What causes a DPF to become blocked?
Short journeys, sensor faults, injector or EGR problems and oil consumption.
Can a blocked DPF cause loss of power?
Yes — the car may enter limp mode to protect the engine.
Can you clean and diagnose DPF systems?
Yes.
Why does a DPF problem sometimes return after regeneration?
Because the underlying cause hasn’t been fixed.
Do you remove or delete DPF systems?
No. The Factory diagnoses and repairs emissions systems legitimately and does not remove, delete or code out emissions equipment.
Related services
EGR Repairs
EGR valve and cooler diagnosis and repair.
AdBlue / SCR Repairs
Legitimate diagnosis and repair of AdBlue warnings and countdowns.
Emissions Diagnostics
MOT emissions failures, smoke and emissions warnings diagnosed.
Vehicle Diagnostics
Dealer-level fault finding — not just reading and clearing codes.
JLR AdBlue & DPF
Jaguar and Land Rover DPF and AdBlue diagnosis.
Need help with dpf diagnostics & cleaning?
Send your registration and a quick description on WhatsApp, or call the workshop.
The Factory, Harris Way, Sunbury-on-Thames TW16 7EL