Why decarbonise an engine?

Simple put a clean engine is a healthy engine

dirty_egr_valve_decarboniseThe purpose of the EGR (Engine Gas Recirculation) system is to reduce nitrogen oxide (NOx) emissions that primarily forms when nitrogen and oxygen is subject to high heat and pressure. Nearly all modern engines require an EGR system to meet emissions regulations. The system is designed to recirculate exhaust gases back into the intake system which reduces either O2 in diesel engines intake stream or combustible matter in a petrol engines intake stream. These gases have little or no ability to react to the second combustion cycle they are subjected too thus helping to reduce combustion heat and in-cylinder temperatures.

Unfortunately these recirculated exhaust gases carry a lot of carbon, unspent fuel (including varnishes) and oil vapour which gradual accumulates and bonds as carbon particles inside the inlet and re-circulatory system and especially on and around the valve itself. This leads to numerous engine problems and worst case even engine failure.

The specific purpose of the EGR valve determines if, when and how much exhaust gases are recirculated. As carbon deposits build up in and around the valve it prevents the opening and closing of the valve operation, and worst case the valve can become stuck losing all functionality.

Usually the initial driver symptoms of the clogging of an EGR valve is lose of power and engine stalling, especially when coming off load. Eventually the valve will stick in either the open or shut position. If stuck open the carbon build up saturation will be accelerated whilst if stuck shut it will cause excessively high emissions and ultimately MOT and/or roadside emission test failures.

How to clean the EGR Valvedirty_egr_valve2_decarbonise_small

There are numerous ways to clean or replace the EGR valve with varying prices.
The costliest option is a complete replacement part. Most mechanics will recommend this – Why? Because they’ll earn a profit from the part and it’s a quicker job for them. The price of a EGR valve varies on average between £300 and £800 plus labour for fitting.

cleaned_egr_valve_smallThe moderately expensive alternative is to remove the valve a manually clean it which requires mechanical skill and time. The problem is not all valves are so easy to remove and refit and the outcome may not always be successful. As there are no replacement parts involved the cost of this service will be purely based on your mechanics labour charges so expect anywhere from £200 – £400.


Motorcycles carbon cleaning: £74.99 – £104.99

Cars: £89.99 – £149.99

LGV: £119.99 – £169.99

HGV’s and all others: POA

DPF Cleaning (Cars & LGV): £249.99

Discounts for carbon cleaning and DPF cleaning together from as little as £299.99

Call us for multi-vehicle discounting (as much as £50 per vehicle!)

Book a Service


01293 769495

Call us for advice

Find a technician

Opening Hours

WEEK DAYS:08:30 – 20:00
SATURDAY:08:30 – 17:00
SUNDAY:09:00 – 16:00
Bank Holidays:On request

Book a Service

CarbonCleaning EGR Valve cleaning

image010If your vehicle requires professional intervention to unclog the EGR system and valve there is no better alternative.

Starting at just £89.99 (including FREE before and after OBD Diagnostic tests) our Carbon Cleaning method is the least expensive.

The advantages are:-

  • Our Mobile Carbon Cleaning Technicians come to you
  • Potentially no expensive parts
  • No disassembly is required so no expensive labour
  • Completed in just 30 minutes so no having to leave your vehicle with the professionals
  • We are fully insured to compete this service at roadside or wherever your vehicle is located

As a preventative measure against clogging of the EGR valve we recommend treatment every 15,000 miles

Thanks to the specially designed hydrogen treatment CarbonCleaning is the breakthrough alternative eliminating the need to replace expensive parts.

Business Opportunity

Become a UK Carbon Cleaning Partner

Whether you are considering starting your own mobile carbon cleaning service or expanding your garage / workshop services we have the perfect solution for you.

Dependant on circumstances and location we also offer our unique marketing services that will as good as guarantee our quoted income potential. For further information please view the Business Opportunity page under the Trade section of our website. or contact us with any questions about how to become a UK Partner.