P0299 Turbo Underboost – Ford Mondeo 2.2 (2012 – 115,846 miles) – diagnostic and Engine Carbon Clean

P0299 Turbo Underboost ⭐⭐⭐⭐⭐ ‘Adrian was very professional and shared all the live data that was captured. The car is now alot more responsive. I will be using this company again for sure.’

Ford Mondeo (2012 – 115,846 miles) P0299 Turbo Underboost

Reason for booking in…
‘I have been having issues of the car engine malfunction light coming on. It shows a fault code of p0299’

Initial inspection found no obvious issues in the engine bay with no rattles and shakes, but a tell tale rumble in the engine from the carbon present and an exhaust note not quite right.

Initial code read found… P0299 Turbo Underboost
P0299 Turbo Underboost had been on recently and other codes in other parts of the car for speakers, old bulb codes, heated mirrors and ECU communication codes.

Live data is where things started getting interesting.
1 – DPF soot levels would indicate it was blocked, but no DPF codes present (usually meaning DPF was no longer present).
2 – The vehicle running at 74°C maximum due to the thermostat stuck open – the original cause of the DPF issue.

️ After discussing with the owner it was clear that the place that ‘fixed’ the DPF issue removed the DPF and remapped it. After a little more discussion it became clear that the turbo underboost issues had only presented themselves after the DPF ‘fix’ and remap.

‍We continued with the clean and It soon smoothed out, quietened down and by the end it was quiet, smooth and responsive again.

❗ The owner can now get the thermostat and DPF issues resolved.

P0299 Turbo Underboost
P0299 Turbo Underboost
P0299 Turbo Underboost ford Mondeo

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☑️ Which? Trusted Traders approved Engine Carbon Clean
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Engine Carbon Cleaning FAQs

What does an Engine Carbon Clean do?

Keeping your engine cleaned on a regular basis helps prevent issues such as DPF issues, MOT emissions failures or sticking turbos. It also helps prevent issues such as DPF issues, MOT emissions failures or sticking turbos. An Engine Carbon Clean is great at cleaning up the back of a turbo, combustion chamber, injector tips, pistons, cylinders and cats to get a vehicle running smooth, quiet, responsive, economical and emissions friendly again.

What does DPF Cleaning do?

A mobile service to properly diagnose, clean and reset a DPF.  Suitable for soot and oil blockages and on a maintenance basis to avoid residual ash accumulation, causing regeneration issues. DPF Investigation and Clean Service

Can you carbon clean a petrol engine?

Yes. All hydrocarbon engines create carbon build up depending on the mileage, driving style, journey length and fuel quality used. You can clean petrol, diesel, LPG, hybrid or anything else such as methane.  Not just cars and vans, but we also work on boats, tractors, tanks, generators, landfill engines, anything really.

What are signs of carbon build up?

Typical symptoms include a decline in fuel economy, noisier engine, increased vibration, sluggish response and smoke/emissions levels. As fuel economy and emission targets have got stricter over the years the engine components have been developed and added in order to keep the soot within the vehicle rather than passing it out through the exhaust. This then clogs up EGR valves, inlet manifolds and DPFs.

When should you Engine Carbon Clean?

If you have just bought a vehicle or warranty is due to expire then it is a perfect time to get it checked out and cleaned up. As part of your regular maintenance plan an ideal time is just prior to a service or MOT to help keep your vehicle running smoothly, quietly, economically and with low emissions. Most people are coming back for repeats approximately every 15-20k miles based on driving style, journey length and fuel quality.

Does Carbon Engine Cleaning actually work?

Yes it does and it is very good at what it does as long as the relevant pre-checks are performed to ensure an effective clean and critically it is done by someone who is properly trained, certified, with the right approach and equipment.

Still got questions?

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Reviews For our Engine Carbon Cleaning Services

Mohammad Hossen profile picture
Mohammad Hossen
3 days ago
Fantastic service from Leon- what a knowledgeable gentleman who did a thorough check and diagnostic and advised accordingly on key issues. Car run beautifully following the carbon engine clean.
michael mcneive profile picture
michael mcneive
5 days ago
I had a DPF clean which has worked perfectly and got my diesel Rav4 back into perfect driving condition. Steve, the technician was very friendly and talked me through the whole diagnosis and treatment.
Silent Scream profile picture
Silent Scream
6 days ago
Recently bought a Mazda cx5 diesel and wanted piece of mind the engine had been cleaned. I was getting at most 44mpg (best I had got) I am now getting 49mpg. Well worth it and great people. Thanks again !
Alan Moore profile picture
Alan Moore
1 week ago
Just had my car done by F5ECC. Adrian talked me though how the process works. This is the second Merc I have had done by him in 2020. C250cdi and now a C350e sport. Noticed straight away more mpg. The car felt a lot smoother on acceleration. I was quite shocked at how much quicker and responsive the car was when I put it in sport+. I highly recomend having this done. Alan Moore. 66 plate C350e 75000 miles.
JAKE tyler profile picture
JAKE tyler
1 week ago
Adrian was very friendly and professional, showed me everything he did and talked me through the process… Plus car feels great 10/10 would recommend
Owen Moore profile picture
Owen Moore
2 weeks ago
Adrian came out and did a carbon clean on my Mercedes CLA45. If you've purchased a used car that's done a good amount of miles then I would highly recommend getting this done. It made all the difference to mine. Throttle response is better the car feels better as it climbs through the gears. Adrian was here for about an hour, was happy to talk through the process and shared diagnostic info straight to my phone. Really helpful and knowledgeable. Owen Moore.
Paul Auton profile picture
Paul Auton
2 weeks ago
Had Adrian carbon cleaning my Audi 2021 A4 tdi .waited to see results over a period of time .car runs smoothly and accelerates with ease The car seems to get to 60 mpg very quickly and just goes up from there so impressed. Adrian Improved the 4 injectors performance but found no 3 slightly out of spec .Adrian went tho the cars diagnosis system very impressive I would highly recommend paul .thanks Adrian
Sanjeev Kumar profile picture
Sanjeev Kumar
3 weeks ago
I found this organisation on Google. It had great reviews and the service which I required which was a carbon clean. I found Adrian very helpful and knowledgeable. While he was carrying out the service he explained everything to me and how it works. The car feels better now with it being more responsive and quieter. I would recommend Adrian and his company to friends and family if they required his services. Thanks Adrian hopefully see you again sometime.
Robert Maybury profile picture
Robert Maybury
3 weeks ago
This was my first experience with F5 carbon and DPF clean. I was a little desperate as I had been let down twice by a larger franchise company. Mark the technician managed to fit me in at short notice, what a stroke of luck for me I found Mark to be an extremely knowledgeable and professional guy. After running the diagnostic and clearing a few issues he managed to get my DPF working properly and able to do the regeneration process on its own so only charged for the diagnostic even though I had booked for a full DPF cleaning. I cannot recommend F5 enough it's a real pleasure to deal with them. All round excellent service. Thank you guys.
Owen Simpson profile picture
Owen Simpson
2 months ago
Adrian is a lovely fella, explained the process, carried it out well, clearly done exactly what it needed to do as I blew a load of stuff out the back when I drove it after. Will definitely be coming back in the future.
kenny bennet profile picture
kenny bennet
2 months ago
Great job Car running a lot better Highly recommend
Iain Tribick profile picture
Iain Tribick
2 months ago
Steve arrived to give my Jaguar xfs an engine carbon clean. Presently on 107,000 miles. Explained the process and was obviously very knowledgeable about the process and expected outcomes. And he was a thoroughly nice chap. The V6 in the xfs is a quiet, smooth, powerful unit and I was not sure of what improvements I would get. Well, I’m impressed. The power delivery is smoother, the engine even quieter and 6 mpg better to boot. If you want to do one thing to maintain and improve your motor, then this is what you should do.

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