ADAS Calibration After Bumper Repair: What to Do Next
Had a bumper repair, and been told your car needs ADAS calibration? The body shop is right, and it isn't an upsell. The radar that runs automatic emergency braking and adaptive cruise sits low in the bumper area, and moving the bumper moves it. Here's why it's needed, what it costs, per system from £162 inc VAT, and whether your insurer should pay.
If the body shop said you need this, they're right
ADAS calibration after bumper work isn't an upsell. The forward radar that runs automatic emergency braking and adaptive cruise sits behind the bumper and grille, and on many cars the parking sensors and surround-view camera share the same bumper. Take the bumper off to repair a scuff, or knock it hard enough to shift it, and those sensors no longer point where the car expects. They have to be recalibrated to read the road safely again.
Why a bumper repair throws ADAS out
Modern cars carry a forward radar mounted low in the front of the car, behind the badge or down in the bumper depending on the model. The radar is aimed to a fine tolerance, a fraction of a degree, and automatic emergency braking and adaptive cruise trust that aim completely.
Take the bumper off to repair it, or knock it hard enough to move it, and the aim shifts. The car can't tell the sensor is now pointing slightly wrong. It either switches the system off and shows a warning, or keeps running on bad data. Recalibration resets the sensors to the manufacturer's reference. It's a separate job from the bodywork, and most body shops don't carry the equipment for it.
The front radar isn't the only sensor in the story. Rear bumper work disturbs the blind spot radars tucked into its corners, parking sensors mount through the skin of either bumper, and on cars with a surround-view camera the front slice of that image comes from a camera in the nose. What bumper work doesn't reach is the windscreen camera up by the rear-view mirror: it runs the lane systems, which is why those usually carry on as normal after a bumper repair. If camera warnings have joined the radar ones, look to the crash itself, or to a battery that was disconnected while the car sat in the shop, not the refit.
The trigger isn't always bodywork, either. Replacing a radiator or air-con condenser means the bumper comes off and the radar bracket often comes off with it, so the same misaimed radar turns up after cooling-system work with not a mark on the paint.
Which warning has come up?
A bumper repair disturbs different sensors depending on what was done. If a specific warning is showing, go straight to its guide. Driving a Nissan or a Mercedes? Their make guides cover bumper and collision work in depth.
- SymptomsRead more
ACC deactivated
Adaptive cruise greyed out or showing unavailable.
- SymptomsRead more
Front Assist not available
The automatic emergency braking warning.
- SymptomsRead more
Forward collision warning fault
The collision warning system flagging a fault.
- SymptomsRead more
Lane assist fault
Lane keep or lane departure not working.
- SymptomsRead more
Nissan: ADAS after bumper repair
The radar sits behind the Nissan badge, and the badge comes off to reach it. The whole Nissan case, priced per system.
- SymptomsRead more
Mercedes: collision repair recalibration
Front hits reach the Distronic radar, rear ones the blind spot corners. Every disturbed sensor priced as its own line.
Before you book, a two-minute check
- 1
Check nothing was left unplugged
Ask the body shop, or look yourself, whether every sensor connector behind the bumper went back on. A radar or camera left unplugged shows the same warning as a misaligned one, and that's a five-minute fix, not a calibration.
- 2
Check the bumper is seated properly
Run your hand along the bumper line. Uneven gaps or a popped clip mean the bumper, and the radar behind it, isn't sitting where it should. Worth raising with the body shop before anything else.
- 3
Clean off masking residue or overspray
Repair work leaves tape residue, polish and light overspray. Over the radar or the camera that alone can block it. Wipe the badge area and the inside of the windscreen by the mirror.
- 4
Note which warnings are showing
Write down the exact dashboard messages. They tell you, and us, which sensors were affected, and they point you to the right guide above.
How we fix it
If the checks above haven't cleared the warnings, the next step isn't a calibration booked on a hunch. It's the diagnostic scan, £54 inc VAT (£45 +VAT), which reads every module and shows what actually moved. A post-repair dash has more than one possible story: a radar nudged out of aim by the refit, a reference lost when the battery went flat on the body shop's ramp, or a sensor damaged in the original impact. The scan separates those before you spend anything on the wrong fix.
Where the aim has drifted, a technician realigns each sensor the scan flagged to the manufacturer's reference, clears any stored fault, and confirms the safety systems are working before you leave. The common outcome after bumper work is one system, the front radar, at £162 inc VAT (£135 +VAT). When more than one system moved, the parking sensors after a bumper-skin respray, or the blind spot radars after rear work, each is its own line. Two or more systems in one visit: the highest-priced system is full price and each additional system is 35% off at a centre. Scans sit outside the discount. A sensor damaged in the original impact needs replacing before any calibration will hold; once the new part is fitted, the calibration that follows, coding to your car included, is £232.80 inc VAT (£194 +VAT).
Whatever the scan found, the visit closes with a calibration certificate. Certificate to manufacturer tolerances, the same standard dealers issue. If the repair ran through an insurance claim, ask the body shop whether calibration was already part of the repair bill before arranging your own; it often is, and nobody should pay twice for one job. The full procedure is in our ADAS calibration guide. Your quote is confirmed in writing before anything is booked.
ADAS calibration prices
A front bumper off usually means one system, the front radar; rear bumper work lands on the blind spot corners and the parking sensors at the back. Rates are the same at every service centre, per system, shown inc VAT with the net figure alongside. Your total is confirmed in writing before anything is booked.
Calibration — per system
Coding a replaced part to your vehicle
- When your job needs a diagnostic scan, it's £54 inc VAT (£45 +VAT), always itemised as its own line. It shows which systems were live before work started.
- Two or more systems in one visit: the highest-priced system is full price, each additional system is 35% off at a centre. Scans aren't part of the discount. Front camera and front radar together come to £267.30 inc VAT (£222.75 +VAT).
- A replaced camera or radar is coded to the vehicle and then calibrated, so a replacement job is the coding line above plus the calibration for that system, with the multi-system discount applied at a centre. Your written quote itemises both.
- On mobile trade visits only: if the technician attends and the calibration can't be completed, a sensor fitted misaligned for example, a call-out fee of up to £72 inc VAT (£60 +VAT) applies.
- Mobile calibration is available for garages and bodyshops with workshop conditions. Ask us.
Frequently asked questions
They're right. Any repair that takes the front bumper off, or a knock strong enough to move it, shifts the radar and cameras behind it out of alignment. The safety systems can't work properly until they're recalibrated. A good body shop flags it precisely because they know they can't do that step themselves. It's the opposite of an upsell, they're sending the work elsewhere.
When the bumper repair is part of an insurance claim, calibration is often handled inside the repair itself: many body shops arrange it and it appears on the repair bill rather than coming to you separately. That varies from shop to shop, so read the estimate and ask directly whether calibration was included and whether a certificate came back with the car. If it wasn't included and the job lands with you, this page's per-system rates apply, and the written quote gives you an itemised figure to show your claims handler or the body shop.
ADAS calibration needs dedicated target equipment, a level calibration bay and manufacturer software, a separate setup from bodywork tools. Most body shops, even good ones, don't have it. Access can be the issue too: on some Nissans the front sensor sits behind the badge and can only be reached once the badge is off, which catches fast-fit garages out. Our Nissan bumper-repair guide covers that. The equipment and the access are the gap our service centres fill.
Front radar calibration is £162 inc VAT (£135 +VAT), front camera is the same, with the full rate card on this page. Two or more systems in one visit: the highest-priced system is full price and each additional system is 35% off at a centre. On a bumper job that discount matters, because more than one sensor can move in one repair. If the scan shows a sensor was damaged in the original impact and needs replacing, you'll know that cost before any work goes ahead. A diagnostic scan, when your job needs one, is priced and itemised separately.
Quite possibly, yes. A sensor can be knocked out of alignment without the car flagging a fault, the forward camera especially. It carries on running, just on slightly wrong data, which is the worst case for a safety system. If the bumper was removed or took a real knock, a calibration check confirms the sensors are still reading true, warning light or not.
There isn't a single honest number: the visit depends on what the scan finds and whether your model needs a road check after the target work, so the centre confirms expected timing when the booking is confirmed. It's a workshop appointment rather than a leave-the-car-for-days job, and if the scan turns up damaged hardware, parts come before calibration and you'll hear about it first. Slots open often within the week, depending on centre availability.
It can be, for a different set of sensors. The rear bumper corners carry the blind spot radars on many cars, and the bumper skin holds the rear parking sensors, so a rear-end repair or respray disturbs those rather than the front radar. Blind spot radar calibration comes to £162 inc VAT (£135 +VAT) and parking sensor calibration £184.80 inc VAT (£154 +VAT), each on the quote only when the scan shows it moved.
Yes, and it catches people out because there's no accident in the story. Replacing a radiator or air-con condenser means the front bumper comes off, and the radar bracket often comes off with it to reach the parts behind. The radar goes back within millimetres of where it was, which can still be enough to move its aim past tolerance, and the dash may show nothing at all while it runs misaimed. Treat it like any other bumper-off job: book a calibration check afterwards, priced as one system at £162 inc VAT (£135 +VAT) for the front radar.

Book your post-repair calibration
Tell us your registration and what the body shop did. We come back with the price, the nearest service centre, and the soonest slot.