MMT Experts Reviews 

6
•
TrustScore 4 out of 5

4.2

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Company details

  1. Auto Repair Shop
  2. also in
  3. Auto Parts Manufacturer
  4. Mechanic
  5. Transmission Shop
  6. Used Auto Parts Store
  7. Used Car Dealer

Written by the company

MMT Experts is the UK’s leading specialist in fixing semi-automatic gearbox issues, including the common PO900 clutch actuator fault. Based in Windsor, we work with customers nationwide to diagnose, collect, repair, and return vehicles suffering from gearbox faults, actuator issues, and warning light problems. We’re best known for our expertise with the Toyota Aygo, Peugeot 107, Peugeot 108, Citroën C1, and Toyota Yaris — all of which use MMT (MultiMode Transmission) systems that we repair to perfection. Whether it’s a faulty clutch actuator, a PO900 gearbox code, or an automatic gear selection issue, we provide full reconditioning and fitment with warranty. Unlike main dealers or local garages, we’re fast, affordable, and offer better-than-scrapyard prices for non-running vehicles with gearbox faults. With over 15 years of experience, a fully equipped workshop, and a 100% fix success rate, MMT Experts is the most trusted name in semi-auto gearbox repairs in the UK. We also sell and supply reconditioned MMT parts and provide better deals when we handle the full repair ourselves. We help individuals, trade customers, garages, and fleet owners get their vehicles back on the road quickly and reliably. Our nationwide vehicle collection and fair pricing make us the go-to choice for anyone dealing with MMT faults, actuator problems, or PO900 errors. If your car has stopped selecting gears, is showing warning lights, or has a PO900 clutch actuator fault — call MMT Experts first. We’re here to help.


Contact info

4.2

Great

TrustScore 4 out of 5

6 reviews

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4.2

All reviews

(6)

1 review in the last 12 months

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Rated 5 out of 5 stars

MMT Experts is better than ECU Testing

MMT Experts is better than ECU Testing. MMT Experts did a fantastic job rebuilding the clutch actuator. Clean, new hardware, new sensor, Elec-motors. Best quality. I also needed another part the gear shift actuator rebuilt but I first tried ECUtesting. For how much I paid on the rebuild they didn't bother to make a nice rebuild quality. ECUtesting Gear selector unit was filthy, greasy finger prints on it. Nothing was cleaned and they reused old bad hardware. MMTexperts win and did beautiful.

August 27, 2026
Unprompted review
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Rated 5 out of 5 stars

Excellent in every way ...100% Recommended

Our son has a Toyota Aygo with the MMT gearbox. It began beeping randomly, and it took us ages to realise it was warning of a slipping clutch. After taking it to Toyota, we were quoted nearly £3,000 for repairs.

By chance, I then came across Dean at MMT. I’m an engineer, so I’m always cautious about third-party garages—but I couldn’t be more impressed. The service was excellent, the work was completed incredibly quickly, and the quality of the repair was outstanding.

I would recommend Dean and MMT to anyone. Absolutely excellent service all round.

October 27, 2025
Unprompted review
Rated 5 out of 5 stars

Highly recommend

Couldn't be a more positive experience.

Had issues with my wife's Yaris clutch actuator. Sent it off to these guys for repair, not only did they do an excellent job repairing it, but it was back in my hands the following day!

In addition, my local mechanic hadn't changed a clutch on a semi automatic car before, so Dean kindly spoke to him and offered invaluable advice on how to proceed with it. Customer service just doesn't happen like this anymore!

Would recommend this company to anyone. Thanks again Dean 🙏

September 18, 2025
Unprompted review
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Reply from MMT Experts

Thankyou Adam you are more then welcome. 🙂

Rated 5 out of 5 stars

Toyota Yaris gearbox faults

They answered the phone and were able to talk to me , they listened and then told me what the problem was , what they could do to fix it , how much and how long to do it . I left it with them and they did exactly what they promised which is quite rare these days . I am over the moon with the result and would have no hesitation in recommending family or friends to contact them .

July 18, 2025
Unprompted review
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Reply from MMT Experts

Hi Lisa,
Thank you so much for your kind words – it really means a lot. We're genuinely pleased to hear you felt listened to and looked after throughout the process. We always aim to be clear, honest, and helpful, and your feedback reassures us we're on the right path. You're very welcome any time, and we’re always here if you or your friends ever need us again.

– Ben, MMT Experts

Rated 5 out of 5 stars

I am delighted to have Dean and Roy and…

I am delighted to have Dean and Roy and their team engage their expertise on My MMT Toyota Yaris.

These guys are FIRST CLASS. There is no doubt they are for sure true experts in their field.

Roy and Dean are very helpful and customer friendly. Dean and Roy are also very kind and generous in their customer service.

In 50 plus years I have never interfaced with two Geniuses who clearly know there area of expertise as of the likes of Dean and Roy.
It is a real pleasure to have met two GENUINE experts who clearly resonate with Joe Public.

Thank You Dean and Roy for taking care of my car and raising it up to a very high standard.

I am very impressed and very grateful indeed in the HIGH QUALITY of service and at reasonable rates to. That you have given to me.

Thank You Dean and Roy.

From A Very Happy Customer Indeed.

March 20, 2025
Unprompted review
MMT Experts logo

Reply from MMT Experts

Thank you so much for your incredibly thoughtful words – I’ve passed them on to Dean and Roy, and they were truly touched. It means the world to us to hear how much you valued the care and effort they put in. We take great pride in doing things properly, and it's always a pleasure working with customers who appreciate that. If you ever need us again, we're just a call away.

– Ben, MMT Experts

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