Does A Driver's Seat Need To Slide For An MOT? A Complete Guide
Fixed seat guide
If you fit a fixed bucket seat to a road car, one question comes up sooner or later: will it pass an MOT if the driver's seat does not slide? The short answer is yes, it can. The MOT inspection manual says a fixed driver's seat is not a reason for failure. What the tester does check is that the seat is secure and sound.
Plenty of performance cars run fixed bucket seats, aftermarket recliners or custom mounts, so it is worth knowing what the test looks at. This guide covers what the manual says, where a fixed seat can still cause a problem, and how to fit one so it is secure.
- The MOT manual: a fixed driver's seat is not a reason for failure
- The tester checks the driver's seat is secure
- An insecure driver's seat is a dangerous defect
- On an adjustable seat, a runner that does not work as intended is a major defect
- Fit fixed seats with proper side mounts or frames, and check the seat belt still works correctly
What the MOT manual says about the driver's seat
The MOT inspection manual for cars sets out what the tester checks. For the driver’s seat, the instruction is to check its security. On manually adjustable seats the tester checks it in several positions, and the adjustment should lock automatically in the normal positions.
The manual is also clear on the question most people ask: a driver’s seat that is fixed, or cannot be adjusted through the manufacturer’s full range of fore and aft adjustment, is not a reason for failure.
The defects the tester is looking for are:
- a driver’s seat with a defective structure (major)
- a driver’s seat that is insecure (dangerous)
- a fore and aft adjustment mechanism not working as intended (major)
- a seat that moves when it should not, or a backrest that will not stay upright (dangerous)
So a fixed seat can pass, as long as it is secure, sound and the rest of the car, seat belts included, is in order.
Why most cars have sliding seats
Factory seats slide for practical reasons. Different drivers can set the seat for their own reach to the pedals and wheel, get a good view out, and share the car without fuss. In a family car, that matters.
In a performance or track car, the priorities change. A fixed bucket seat holds the driver firmly in place, with less movement in hard cornering and braking, and it is often lighter and lower. If the car only has one regular driver, the loss of adjustment is a small price.
It is also worth knowing that a fixed back seat does not have to be fixed in position. Many bucket seats can go on runners, so the seat keeps its fore and aft adjustment. If you share the car, that is often the best of both.
When a fixed seat could still cause a problem
The fact that a seat does not slide is not the issue. The problems come from how it is fitted:
- The seat is loose or insecure. Any movement in the seat, its brackets or its mountings is a dangerous defect.
- Damaged mountings. Cracks, corrosion or bent brackets count against the seat structure.
- The seat belt does not work properly. The belts are checked in their own right. With a new seat, make sure the belt can still be fastened, locks and retracts as it should, and is not fouled by the seat.
- An unsafe driving position. A seat that stops the driver reaching the controls properly is a safety concern, whatever the test says.
Most of the work in fitting a fixed seat is in the mounting. A bucket seat typically sits on a pair of side mounts, which bolt to a subframe made for the car, and the subframe bolts to the factory seat mounting points. Runners can go between the side mounts and the frame if you want to keep adjustment.
Using parts made for the seat and the car is what keeps the seat secure, and a secure seat is what the tester is checking.
How to fit a fixed seat so it is secure
If you are fitting a fixed back bucket seat, these are the checks we suggest:
- Use proper mounts. Fit the seat with side mounts made for it and a frame made for the car, or on the correct base plates. Never improvise brackets.
- Check for movement. With everything tightened, push and pull the seat hard. It should not rock or shift.
- Check the seat belt. The belt should fasten easily, sit correctly across the driver and retract without catching on the seat.
- Check the driving position. The driver needs full reach to the pedals, wheel and controls.
Garreth’s advice is to buy the mounting parts at the same time as the seat, so everything is matched from the start. Brands pair differently: for example, Recaro base mount seats go straight on Planted brackets but need a little modification and drilling for an OMP base frame, and Recaro and Corbeau parts do not mix. Tell us the car and seat and we will confirm what you need.
Passenger seats and checking with your tester
Passenger seats are checked in the same way for security and structure. An insecure passenger seat is a dangerous defect, and one with a defective structure, or a backrest that will not stay upright, is a major defect. A fixed passenger bucket seat can pass on the same terms as the driver’s seat.
If you have made changes to the seats, it does no harm to mention them to your tester before the test. Our common questions about bucket and racing seats also cover airbags and fitting.
Does a driver's seat have to slide to pass an MOT?
No. The MOT inspection manual says a fixed driver’s seat, or one without the full factory range of adjustment, is not a reason for failure.
Will a fixed bucket seat pass an MOT?
It can, as long as it is secure, the structure and mountings are sound, and the seat belt works correctly.
What seat faults fail an MOT?
An insecure seat, a defective seat structure, an adjustment mechanism that does not work as intended, or a backrest that will not stay upright.
Can I keep adjustment with a bucket seat?
Often, yes. Many bucket seats can be fitted on runners between the side mounts and the frame.
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The short answerFixed is fine, loose is not
A fixed driver's seat is not an MOT failure; an insecure one is.
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