MOT Retest Rules and the Free Retest Window Explained

How the MOT Retest Works

When your car fails its MOT it needs the faults repaired and a retest before it is legal again. The good news is that a retest is often free or reduced, provided you use the same garage and act within a set window. This is known as a partial retest.

A partial retest only rechecks the items that failed the first time rather than inspecting the whole car again. It is quicker and cheaper than a full test. In many cases it costs nothing at all. The key is where the repairs are done and how quickly the car comes back. Our guide on When Your Car Fails an MOT explains what a fail means in the first place.

The window that matters is ten working days from the original test. Return to the same garage inside that time and you keep the partial retest. Leave it longer and a full test fee usually applies, so a prompt repair is the way to save money.

When a Retest Is Free or Charged

The cost of a retest comes down to where the repairs happen and when the car returns. The table below sets out the common situations.

The pattern is clear. Keeping the repair and retest at the same garage inside the ten day window is the cheapest route. Our guide on How Much Does an MOT Cost puts the retest fee in the context of overall MOT costs.

The Difference Between a Partial and Full Retest

The distinction between the two types of retest is worth understanding, since it affects both time and cost. A partial retest is the quick, low cost option, while a full retest is a fresh inspection of the whole car.

For most drivers the partial retest is the one that applies, as long as the car goes back promptly. Our guide on Driving After a Failed MOT explains what you can do with the car between the fail and the retest.

How to Make the Most of the Retest Window

A little planning keeps a retest cheap or free. The aim is simple, to have the repairs done at the test centre and the car retested inside the ten working day window.

Booking with a garage that can test and repair in one place makes all of this effortless, since the car never leaves. Our guide on When Your Car Fails an MOT explains what a fail means and the categories of fault.

What if You Think the Fail Is Wrong?

Now and then a driver believes a fail is unfair or a fault has been called wrongly. If that happens you do have a route. You can raise it with the testing authority, which can look into how the test was carried out. It is sensible to do this before you have any repairs done, since carrying out the work can affect a review of the result.

In most cases a fail is simply the car not meeting the standard, so the quickest path back to the road is a prompt repair and retest. If you do have a genuine concern about how a test was handled, raise it calmly with the garage first, as many issues are resolved with a straightforward conversation. Our guide on When Your Car Fails an MOT explains the fault categories that decide a pass or fail.

Handle a Fail With Confidence

This guide is part of our full MOT Guides hub, where the testing, cost and rules articles sit together so you can move to the exact detail you need next. When it is time to book, our team offers full MOT testing and repairs from our centre in Ely. You may also find it useful to read When Your Car Fails an MOT, Driving After a Failed MOT and How Much Does an MOT Cost.

Common Questions