Twelve checks. On every call-out. Included in the price.

1)Full system scan

2)Live running data

3)Airflow

4)DPF pressure sensor and pipework

5)Exhaust backpressure

6)EGR valve, live actuator test

7)EGR cooler and thermostat

8)Emissions sensors and AdBlue dosing

9)Regeneration history and exhaust

10)temperatures

11)Fuelling and turbo

12)Hands on the car: pipes and hoses
Battery, charging and wiring

Number 11 is the one most places skip. Not everything shows up on a laptop. A split turbo pipe bleeds away your boost and loads the filter, and it will not always throw a code. That one needs hands on the car.

See what each check covers →

Anyone Can Flush a Filter
A cheap flush is soot in, soot out, problem back in a month. Here is what you get instead:

Diagnostic before cleaning
Full 12-point check
Read the code
Physical inspection
Yes, pipes and hoses by hand
No
Proof it worked
Before and after backpressure figures
None
Report you can keep
Yes, take it to any garage
No
Warranty
30 days
None
Insured
Fully
Ask them
Real Jobs, Real Faults
Vauxhall Insignia 1.6 CDTI: the valve wasn’t the problem
A new EGR valve had already been fitted. We actuator-tested it and it was working perfectly. The real fault was a fouled EGR cooler and a thermostat stuck open, so the engine never got hot enough to burn off its own soot. Replace the valve and miss that, and the fault comes straight back.

Kia 1.7 CRDi: chasing a blockage that didn’t exist
Abnormal soot readings. The filter was not the issue: the differential pressure sensor had a split diaphragm and was reporting a blockage that was never there. We also found a turbo oil leak left behind by a previous garage, and told the customer exactly where that liability sat.

Land Rover Evoque: a sensor killed by low voltage
An emissions fault that would not stay cleared. The upstream NOx sensor had been sitting at low voltage long enough to be permanently damaged, and no amount of code-clearing brings one of those back. The battery needed replacing too. This is why the electrical check is in our twelve.

How It Works
Advanced diagnostics. Dealer-level tools, live engine data, the full 12-point check before anything is touched. If a sensor or hose has failed, we can replace it on the spot.

On-site 3-stage chemical clean.

Dissolves soot and ash while the filter stays on your vehicle. No removal, no strip-down.

Forced regeneration and reset. Controlled regeneration, ECU reset, fault codes cleared.

Backpressure test and warranty. A final test proves the result in numbers, and you drive away covered for 30 days.

Infographic: how AUTODOC MR fixes a blocked DPF, from diagnostics to the on-site chemical clean, forced regeneration and a final backpressure test.

What Our Customers Say
"SAVED ME THOUSANDS in repairs. My mechanic quoted me 2 grand for a new DPF, Kris came out, my car runs great ever since."

"Very impressed with the service that Kris provided. Cleared a fault that a local garage couldn’t. Highly recommend."

Rob Thompson
"Kris was prompt, professional and honest, as well as fixing the DPF issues on my car. Highly recommended."

We Come to You
Based in Watford, covering Hertfordshire, Bedfordshire, Buckinghamshire, Middlesex and North West London, out to Milton Keynes, Oxford, Reading, Guildford and Cambridge.

Home, work or roadside. We work by appointment, so you get a booked slot rather than a wait.

Not sure if you’re in range? Send your postcode and we’ll confirm.

See the towns we cover →
BRENT CROSS
KILBURN
CRICKLEWOOD
HARROW
HEMEL HEMPSTEAD
WATFORD
HAMPSTEAD
ST JOHN'S WOOD
SWISS COTTAGE
CAMDEN
and all surrounding areas.

Straight Pricing
From £100

DPF clean and diagnostic

Most jobs land between £220 and £500, depending on make, model, how badly the filter is blocked and your location. 60 to 90 minutes on site. The 12-point check, the report and the 30-day warranty are all included.

Just want to know what’s wrong?
£100

The same 12-point check plus a written report, no clean, no obligation.

Compare either to £1,000s for a replacement DPF.

Book a diagnostic →

Tell Us What It’s Doing
Send the details and we’ll come back with a straight answer on whether a clean will sort it and what it costs.

Your name *

Phone *

Email (optional, so we can reply by email)

Postcode *

Vehicle make and model *

Registration*

Mobile DPF cleaning and diagnostics across Hertfordshire, Bedfordshire, Buckinghamshire, Middlesex and North West London, out to Milton Keynes, Oxford, Reading, Guildford and Cambridge.

Fully insured · 30 years experience

Call 📞 07479469758 📞 whatsapp 07479469758

Get in touch 📞 07427754557

WhatsApp- 07427754557

Opening hours
24H 7 days a week
Sunday
Open
By appointment, booked in advance.

We are a dedicated team committed to crafting exceptional experiences. Our focus lies in providing reliable and innovative solutions, driven by a deep respect for quality and a genuine desire to exceed expectations.