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Swirl Flap Bypass

Delete the problem rather than expensive replacement parts!


Swirl flaps are small butterfly valves located within the inlet manifold of modern diesel and petrol engines, designed to regulate the fuel-to-air ratio, enhance emissions, and improve torque at low engine speeds. These flaps close at light engine loads to cause air to swirl into the combustion chamber, aiding combustion and improving emissions and torque. Beyond 2000 rpm, the flaps generally open fully, having minimal impact on engine performance and emissions.


Potential Issues with Swirl Flaps:

  1. Leaking Manifolds: Over time, seals around the flap spindle may deteriorate, leading to pressurised air leaks from the inlet manifold. This can cause the vehicle to run rich and potentially damage components like the DPF and EGR systems.
  2. Carbon Build-up: Carbon from the EGR system and oil from the breather system can accumulate on the flaps, reducing intake manifold size and impacting performance.
  3. Electronic Actuators: Modern designs use electronic actuators for flap operation. Failures in these actuators or position sensors can keep the flaps closed, affecting performance, triggering engine management lights, and possibly causing limp mode.

Most vehicle models will run perfectly fine without functional flaps, in fact the latest engine designs do not include them.


If an engine is suffering from issues with the swirl flaps when the engine management system recognizes this it will put the EML (Engine Management Light) on the dash and possibly put the vehicle into limp home mode.


The manufacturers or general garage repair solution for this is expensive replacement parts, sometimes it’s the whole intake manifold which can run into £1,000’s!

carbon swirl flaps img
autotuner remapping img

Bypassing the Swirl Flaps:

Our bypass remap, cost £389.99 for most vehicles, is a simple solution to switch off the swirl flap system and faults. Most vehicles don’t even require the removal of the swirl flaps, as long as we can leave them in the open position.


Drawbacks of Bypassing Swirl Flaps: The drawbacks are minimal. The impact on emissions and performance at low engine speeds is usually negligible, especially considering that carbon build-up, which begins as soon as the vehicle is used, makes the removal of flaps likely to enhance performance and efficiency.

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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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 work ...

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

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

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

PT
Piers Taylor May 15, 2026
Trustpilot

Great service

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

★★★★★
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 →
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

ND
ND May 9, 2026
Trustpilot

Cristian turned up on time and did the…

Cristian turned up on time and did the 3 stage carbon clean and DPF cleaning on my Mini Cooper D. He explained the process well and was professional and thorough. Oxfordshire location.

SR
Stephen Redford May 6, 2026
Trustpilot

A really valuable service

A really valuable service, friendly, communicative went above and beyond to assist. Will use again every time!

OW
Owen May 5, 2026
Trustpilot

I Was Very Very Happy and Pleased With…

I Was Very Very Happy and Pleased With Christian The Technician He Was So Polite And Professional Explained Every Stage Of DPF Clean ..He Has Done a Miracle For Me.. Cleaning My DPF ..I Would Highly Recommend UKCC They Truly Professional and Clean Service ... Owen Kelly BRISTOL

RM
Richard Morgan May 4, 2026
Trustpilot

Turned up at 8am as promised

Turned up at 8am as promised, spent a lot of time and now the car is back to how it was when it was new. Out of limp mode and no lights on dash board. Thank you job well done.

★★★★★
4.4/5
Read all reviews →

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.

Christian came all the way to Newport and done a very good job diagnosing the dpf problem and explaining everything to me in detail. He came on time and carried out the job efficiently


Faq

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

Unlike just a clean (which may resolve the fault if it’s just carbon build-up) as long as your vehicle is otherwise healthy your vehicle's engine will run perfectly immediately after the service and there are no longer-term negative effects.

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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