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EGR Bypass

and 3-stage Carbon Cleaning Service


EGR Valve Explained: The EGR (Exhaust Gas Recirculation) valve helps reduce vehicle emissions by recirculating a portion of the exhaust gases back into the engine via the air intake system. However, these gases contain carbon deposits, leading to a build-up in the intake manifold, EGR valve, and other components over time. This accumulation can cause the EGR valve to malfunction leading to:-

  1. Reduced fuel consumption
  2. Lack of performance
  3. Reduced throttle response
  4. Limp Mode and Engine Management warning lights


EGR bypassing is a form of remapping (programming the vehicle's onboard computer) for overcoming the problems associated with using an EGR by effectively disabling its functionality. When this is performed, the vehicle will run without any EGR faults, and it'll reduce the build-up of carbon deposits.

dirty egr valve img

Benefits of bypassing the EGR Valve:

  1. Lower engine temperatures
  2. Improves throttle response
  3. Improves fuel economy
  4. Reduces oil contamination
  5. Slow down the carbon build-up in the engine

Benefits of bypassing the EGR Valve:

There are none on the engine, it is purely an emission component. The EGR's sole purpose is to reduce NOx emissions. This is performed by recirculating exhaust gases back in the cylinders, as these gases are already spent it reduces the amount of oxygen in the air used in the following combustion cycles, a lower percentage of oxygen means a lower combustion temperature and therefore less NOx is produced. Disclaimer: NOx is not currently measured on UK's MOT tests so an otherwise healthy vehicle as per manufacturer specification will currently pass an MOT emissions test. However, it should be noted that The UK's Road Traffic Act requires that vehicles on public roads be in a roadworthy condition. Removing or modifying any part of emission control systems, including the EGR system, may render your vehicle unroadworthy and could result in penalties. By requesting this removal service you confirm that you understand that the vehicle should not be used on the road anywhere where it would be illegal to do so. UKCC Auto Techs accepts no responsibility for the use of this service on the public highway where removal of emission controls is prohibited.

Spread the cost over 3 payments

No Interest, No Charges

payment step 1 1

Ask for Payment Assist
When you make your booking ask to spread the cost via Payment Assist. If you book online please ensure you call us in advance.

Unless pre-approved we require a minimum invoice value of £250 to take advantage of the Payment Assist service.

*The payment process is subject to approval by Payment Assist

payment step 2 2

Processing your application with your technician on the day of the service.
No credit check . Instead a high street bank debit card is used to approve pre payments is required.

PLEASE NOTE: Internet only banks such as Stirling Bank are presently not approved by Payment Assist.

*The payment process is subject to approval by Payment Assist

payment step 3 3

Easy payment plan
Upon approval* your invoice is split into 3 equal payments . The first payment is processed on the debit card immediately and you are back on the road. The balance will be split over 2 further monthly payments.

Example: Invoice value £390 divided by 3 = 3 x £130 payments NO INTEREST AND NO CHARGES.

*The payment process is subject to approval by Payment Assist

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Modern Reviews Tabs | UKCC Auto Techs
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Over 50,000 Satisfied UK Customers Since 2016

What Our Customers Say

Latest from all platforms
10
Posted 8 November 2025

Job well done

Thank you Matt, Arrived bang on time carried out arranged work to my Audi and a bit more and some great advice .

Verified reviewer
Job location: RH10 Checkatrade

Best and recommended service.

MI
Mike Jun 13, 2026
Trustpilot

Mike - SN8. Excellent carbon clean and dpf clean

Excellent carbon clean and dpf clean , professional, diligent job carried out by Cristian. Would highly recommend

10
Posted 14 August 2025

Full Carbon Clean and remap

I had the pleasure of meeting Matt today. He was on time, gave great advice, honest feedback, great sense of humour - everything you would want from your technician. Never makes you feel stupid. Explained how the remap works. I'm only disappointed he didn't take a picture of my car for his portfolio.

Verified reviewer
Job location: SL9 Checkatrade

best work ...

TR
Tracy Jun 13, 2026
Trustpilot

Highly recommend Cristian for his…

Highly recommend Cristian for his professionalism and knowledge. He talked me through every stage of what he was doing today. I had the engine carbon cleaning stage 4 service. And he even gave me advise on what i need to do going forward. Will definatly be using his service again. Thank you Cristian

★★★★★
10/10
Read all reviews →
10
Posted 8 November 2025

Job well done

Thank you Matt, Arrived bang on time carried out arranged work to my Audi and a bit more and some great advice .

Verified reviewer
Job location: RH10 Checkatrade
10
Posted 14 August 2025

Full Carbon Clean and remap

I had the pleasure of meeting Matt today. He was on time, gave great advice, honest feedback, great sense of humour - everything you would want from your technician. Never makes you feel stupid. Explained how the remap works. I'm only disappointed he didn't take a picture of my car for his portfolio.

Verified reviewer
Job location: SL9 Checkatrade
10
Posted 9 June 2025

Cleaned DPF and engine very sufficient. Very happy with the service highly recommended.

Cleaned DPF and engine very sufficient. Very happy with the service highly recommended.

Verified reviewer
Job location: RH12 Checkatrade
10
Posted 9 June 2025

Egr issue resolved on my Audi in Kent

Very good and efficient

Verified reviewer
Job location: ME1 Checkatrade
10
Posted 20 May 2025

DPF and egr clean and reset

Great advice from Cristian the technician who advised and then did the job very well thank you very much.

Verified reviewer
Job location: NP44 Checkatrade
10
Posted 13 February 2025

Full carbon clean and DPF clean

Engine management light and coil light came on, had my guy stick a diagnostic tool on it and it said the DPF was blocked. Booked a full 400 quids' worth of carbon clean and DPF clean. Matt diagnosed the problem as a sensor issue which would need a new sensor fitting. I could have got away with just the £90 callout fee but decided to go for full carbon clean at total cost of £210. I appreciate Matt's honesty and not trying to rinse me for a DPF clean. Would definitely use again.

Verified reviewer
Job location: SL0 Checkatrade
4.5/5
Read all reviews →
TR
Tracy Jun 13, 2026
Trustpilot

Highly recommend Cristian for his…

Highly recommend Cristian for his professionalism and knowledge. He talked me through every stage of what he was doing today. I had the engine carbon cleaning stage 4 service. And he even gave me advise on what i need to do going forward. Will definatly be using his service again. Thank you Cristian

MI
Mike Jun 13, 2026
Trustpilot

Mike - SN8. Excellent carbon clean and dpf clean

Excellent carbon clean and dpf clean , professional, diligent job carried out by Cristian. Would highly recommend

JO
John May 30, 2026
Trustpilot

Booked a dpf service and engine carbon…

Booked a dpf service and engine carbon on my Jag xf. E.m.l light on. Cristian came at 8am .Great service. Car was not behaving. But after 5 hours,( sorry to next customer). Cristian explained all through the service.could not fault. Light off.????

SP
Simon Prewett May 29, 2026
Trustpilot

Great service from Christian

Great service from Christian, cleaned my DPF which was clogged and advised on other things that need repairing. Talked me through the whole process, really informative. Highly recommend. Simon. BS34 .

PT
Piers Taylor May 15, 2026
Trustpilot

Great service

Great service, super knowledgeable and able to fix a variety of faults on my BMW

HA
Harrison May 15, 2026
Trustpilot

I had a egr bypass remap and stage 3…

I had a egr bypass remap and stage 3 carbon clean service was quick and efficient and a clear friendly service

★★★★★
4.4/5
Read all reviews →

Best and recommended service.

best work ...

Thank you Christian being so prompt in coming to fix and diagnose the problem I have with my vehicle , service was very prompt with excellent knowledge behind him . I would definitely recommend Christian 100% . Will definitely recommend and use him again . Thankyou for your help

Perfect job thank you so much

I would like to say a big thanks to Crisitian for coming to Bridgwater and helo me to fix my issue with manifild intake and DPF. Very friéndly and professional. Very punctual also. He did his best and very competitive price. I highly recommend his service Thank you

I was satisfied with the service. Christian came to Swindon. I missed him the first time but he came back the next day. I cant fault anything. My car is running smooth now. I even got a discount because i work for the NHS so that was really nice. Would recommend to anyone.


Faq

An average of 60-90 minutes but we recommend allowing for 2 hours.

Unlike just a clean which is not guaranteed to resolve an EGR fault as long as your vehicle only has EGR faults and there are no other associated issues then your vehicle's engine will run perfectly immediately after the EGR bypass and engine carbon clean service.

As with any form of remap file writing, there is always a tiny risk of failure which can lead to difficulties but these can always be recovered. The question shouldn’t be if there are risks but if there was a problem how is it handled? You’ll be pleased to know all our technicians are highly skilled and trained using only the best equipment to protect your vehicle from the risks of damage during the ECU remapping process. Saying that we would not take any risks with your vehicle so for peace of mind UKCC Auto Techs guarantees you that all our technicians are fully insured.

Certainly not. We are a worldwide brand with CE-marked machines, operating in over 50 countries with 100’s of machines being used daily – never has there been an engine damaged from our engine carbon cleaning process. No competitor can give you peace of mind on that scale.

Yes. If you’ve been told or heard differently elsewhere you’re unfortunately been lied to. The good news is this only applies to manufacturer warranties (third-party warranties won’t be affected). Manufacturers make painstaking efforts to clearly state that unapproved modifications to any components will void their warranty so if your vehicle has a manufacturer warranty then you should think twice before having such a service performed on the vehicle.

Yes, because this is just a software fix it would be a simple process of installing the original file on the ECU. We permanently retain your original file just in case you ever require us to reverse the process.

Yes, we offer multi-service and multi-vehicle discounts, discuss this with your local technician.

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