If your car was registered after about 2018, it almost certainly has ADAS. After a windscreen replacement, accident, suspension work, or any "calibration required" warning on the dash, the cameras and sensors need recalibrating. Skipping it means lane-keep, AEB, and adaptive cruise either don't work — or work wrong. We do it at your driveway in under 90 minutes.
What ADAS actually is
ADAS stands for Advanced Driver Assistance Systems. It's the catch-all term for the safety tech in modern cars that watches the road and either warns you or takes over when something goes wrong: lane-keep assist, automatic emergency braking, adaptive cruise control, blind-spot monitoring, traffic-sign recognition, 360° cameras, and so on.
What makes ADAS work is a network of cameras, radars and sensors mounted around the car — most importantly, a forward-facing camera behind the rear-view mirror, a millimetre-wave radar in the front grille, and (depending on the model) cameras in the wing mirrors, the boot lid, and the front and rear bumpers. Each of these has a specific field of view that has to point in exactly the right direction for the car's computer to understand what it's looking at.
That last word — exactly — is the whole point of calibration.
Why precision matters more than you'd think
A forward-facing camera that's only 1° out of alignment is looking at something 1.7 metres off-target at 100 metres away. That's a different car. That's a different lane. That's the difference between an emergency brake that fires correctly and one that fires for nothing — or worse, one that doesn't fire when it should.
This isn't a tolerant system. It can't be: the whole point is acting on tiny visual cues faster than a human can. So the cameras and radars need to be aligned to within fractions of a degree of the vehicle's centre line. That alignment is exactly what calibration sets — and exactly what gets disturbed every time a sensor is touched, a panel is removed, or the geometry of the car changes.
The events that require recalibration
Calibration isn't routine maintenance. It's triggered by specific events. If any of these have happened to your car, you need calibration before it's safe to rely on the ADAS again:
Windscreen replacement
This is the single most common trigger. Almost every modern car has its front-facing camera mounted behind the rear-view mirror, looking out through the windscreen. When the glass is replaced, the camera is removed and re-fitted — and the new glass itself has a slightly different optical profile. The camera will be looking at the world fractionally differently, and the car has no way to know that without a calibration.
If your fitter handed the car back without a calibration certificate (or a clear note explaining they did a "dynamic" calibration on the road), it almost certainly hasn't been done properly.
Accident or any front, rear or side impact
Even a low-speed knock — a kerb, a bump in a car park, a fender-bender — can knock a sensor out of alignment by enough to matter. Radar sensors in particular are surprisingly delicate; a hard whack to a front bumper can shift the radar by 2–3°, which sounds tiny but is enough to throw off adaptive cruise and emergency braking entirely. If you've had anything more than a polish-it-out scrape, get the cameras and sensors checked.
Suspension, geometry or wheel work
This one surprises people. The cameras and radars are calibrated against the centreline of the car as it sits at its normal ride height. Change the geometry — new springs, new shock absorbers, a wheel alignment, a control arm replacement — and the relationship between sensor and road shifts. A car that's now sitting 10mm lower at the front means every camera is looking 10mm higher at the road than it was calibrated for.
You don't need calibration after a tyre change. You do need it after a proper alignment.
Sensor or camera replacement
Anything new in the ADAS chain — a replacement front camera, a new radar unit, a swapped mirror with built-in blind-spot sensor — needs to be calibrated before it'll work. Out of the box, it has no idea where it's pointing.
"Calibration required" warning on the dash
The most direct trigger of all: your car has told you. Most modern vehicles will display a specific warning if they detect that ADAS calibration has been lost — sometimes after a service, sometimes after a battery disconnect, sometimes for no obvious reason. Either way, the systems are either disabled or running blind until calibration is done.
Systems behaving oddly
Lane-keep pulling the wheel when it shouldn't. Adaptive cruise braking for cars that aren't there. AEB triggering randomly. Traffic-sign recognition reading the wrong speed limit. These are all symptoms of a sensor that's drifted out of true. Sometimes there's no warning light — just behaviour that doesn't quite feel right.
What happens if you skip it
The honest answer: your car will probably still drive. The engine doesn't care whether your forward camera is calibrated. But the safety systems will be either disabled, or — worse — running with bad data.
The safety case
An AEB system that's looking at the wrong patch of road will either trigger when it shouldn't (slamming the brakes on you in the middle lane of a motorway), or fail to trigger when it should (a car in front you didn't see). Lane-keep can pull the wheel the wrong way. Adaptive cruise can either ignore the car in front entirely or panic-brake for empty road. These are not abstract risks; they're documented failure modes.
The insurance picture
If you have an accident and your insurer's investigator finds that ADAS calibration was overdue after a known trigger — a windscreen replacement, a previous repair, a bodywork claim — that's a paper trail you do not want. It doesn't automatically void your policy, but it makes the claim significantly more complicated and gives the insurer grounds to contest contribution. Insurer-accepted calibration documentation, on the other hand, is gold-standard evidence that the safety systems were working as intended.
The MOT picture
From April 2023, MOTs in the UK began including ADAS-relevant checks for vehicles where those systems are fitted. A car presenting with active dashboard warnings related to ADAS — and that includes calibration warnings — can fail. This is a moving area of policy, and is only going to get stricter as the fleet of ADAS-equipped cars grows.
Static vs dynamic calibration — and why some cars need both
This is the most common confusion. There are two methods of calibrating ADAS sensors, and the right one depends on the vehicle.
Static calibration
Done in a controlled environment with the car stationary. Specific calibration targets — boards with precise patterns — are placed at exact distances and angles relative to the car. The car's computer uses the targets to set the camera and radar to known references.
Most VW Group, BMW, Mercedes, Audi and Volvo vehicles use this method.
Dynamic calibration
Done by driving the vehicle on a road at specific speeds while the car's computer "learns" the alignment from real-world data — lane markings, leading vehicles, road signs. Requires a clear, well-marked road and the right conditions.
Most Toyota, Honda, Nissan, Hyundai and Kia vehicles use this method. Some makes use both — static first, then a dynamic drive to confirm.
The reason this matters: some fitters will offer to do only a dynamic calibration because it doesn't need any equipment. If your car requires static calibration and someone just drove it round the block, the job hasn't been done. You'll have no certificate, the warning may or may not clear, and the system may or may not be aligned. We do whichever method your specific vehicle requires — most cars we see get a static calibration, some get both.
Who's qualified to do this
There's currently no UK-wide licensing requirement for ADAS calibration — it's still possible, in theory, for a garage with no specific training and no proper equipment to claim they're doing it. The result has been a noticeable variance in quality. Some chains do it brilliantly. Some skip it entirely. Some go through the motions without the right kit.
What to look for: IMI accreditation (the Institute of the Motor Industry runs the recognised UK training and certification programme for ADAS calibration); OE-grade equipment (Autel, Bosch and Hella Gutmann are the main professional systems — these match what main dealers use); and full documentation with every job — pre-scan, calibration record, post-scan, signed certificate. If a calibration provider can't give you those three, walk away.
We tick all three. Our technicians are IMI-accredited, we use Autel IA600 mobile systems (same kit main dealers use), and every job comes with a complete documentation pack that's accepted by every UK insurer we've worked with.
What to expect from us
You can read the full process on the homepage, but the short version: we come to you, we plug into your car's diagnostic port and run a pre-scan to identify exactly what needs work, we calibrate using either targets (static) or a road drive (dynamic) — whichever your vehicle requires — and we run a post-scan to confirm everything's done. You get a signed certificate and a full report before we leave.
Most jobs are 60–90 minutes on your driveway. Most cost from £149. We cover the whole Southeast — Sussex, Surrey, Kent, Greater London — from our base in East Grinstead. Have a look at our full service breakdown or jump to the FAQs if you've still got questions.