Released 6 October 2026. 79 of 925 written ADAS calibration enquiries (8.5%) followed a routine job, with no crash, windscreen, bodywork repair or replaced ADAS part involved. VW Group cars made up 51.9% of those cases, against 38.7% of the other enquiries. A named job shows what came first. It doesn't prove the job caused the fault. The sample is every written enquiry to ADAS Line from 3 October 2025 to 6 October 2026.
Repairs away from the sensors (30.4%) and wheel alignment, tyres or wheels (24.1%) are the two largest groups.
n = 79 cases · one job per enquiry · 3 October 2025 to 6 October 2026
Each of the 79 cases names one routine job as the reason for the enquiry. A named job tells us what happened before the fault. It doesn't prove the job caused it.
Not every fault after a routine job needs targets either. There are three kinds of fix. A steering angle re-learn uses a scan tool and sometimes a short drive. A dynamic calibration has the camera or radar learn its aim on a road drive. A static calibration aims it against targets in a workshop. After a battery or alignment job, some cars clear the fault with a scan and a steering angle re-learn, with no targets; Toyota's battery tip below is one example.
30.4% of cases, 24 enquiries, followed a repair that didn't touch an ADAS part. The jobs customers named include a drive shaft, a gearbox unit, steering work, a headlamp, a radiator, an air con condenser and a bonnet cable.
The front radar usually sits on a bracket behind the bumper, mounted to the crash beam or the radiator support. Whether the bumper coming off calls for a calibration depends on the car. Honda's job aid asks for front-camera aiming after the front bumper or grille is removed and refitted on cars with a multi-view camera, and Volkswagen's tip calls for ACC calibration when the grille is disturbed. Unbolting the radar bracket or the support it hangs on counts as the radar removed and refitted on any make. Toyota's trainer, quoted by Repairer Driven News, says a radar mounted to the radiator support "must also be calibrated in an elaborate series of preparations and calibration steps" when that support is replaced. Steering column work is the other documented route: Hyundai's bulletin on a steering angle sensor reset calls for a reset and calibration after a column swap.
For the gearbox, drive shaft and headlamp jobs themselves, we found no maker document that names them as a trigger. What the makers document is the bumper, grille or radar support coming off to reach them. For other steering jobs, check the maker's procedure. Our page on ADAS calibration after bumper repair covers the bumper-off case.
A Škoda owner in Wales had a drive shaft replaced to cure a shake at speed. Straight after, the car warned that Front Assist was unavailable. The customer then had a diagnostic check, which reported the system as out of alignment.
12.7% of cases, 10 enquiries, followed a new battery, a flat battery or other electrical work.
On some cars the steering angle sensor keeps its centre point in powered memory, so losing power wipes it. Toyota's tech tip "Steering Recalibration After Abnormal Steering Sensation or Battery Disconnect" says that on one model, "Every time the vehicle's battery is disconnected or discharged, the Steering Angle Neutral Point Memorization and the Steering Sensor Zero Point Calibration must be performed." That re-learn is usually done with a scan tool and a drive, with no targets. A weak battery can also switch features off without moving any sensor. Stellantis service guidance says a low battery state of charge "may impact ADAS system functionality", and its fix is to charge the battery and let the vehicle's modules go to sleep, with no calibration.
A Nissan owner in the South West had the battery replaced, and a lane camera warning followed. The fault codes were C1B01, camera aiming incomplete, and U1000, a CAN communication fault. The enquiry said a front camera calibration was needed. A communication code after a battery change is worth clearing and rechecking with the battery fully charged before a calibration is booked. If C1B01 is still there after the clear, the camera needs aiming to Nissan's procedure, and that's the point to book a calibration.
24.1% of cases, 19 enquiries, followed wheel alignment or tracking, new tyres or a wheel change.
The steering angle sensor tells the ADAS where straight ahead is, and an alignment can move that point. Snap-on's "Deal with ADAS Work" says some models need the steering angle sensor re-calibrated "if the vehicle's toe-in is adjusted during alignment work". Fleet Maintenance's article on wheel alignment and ADAS warns that without that reset, the car's idea of straight ahead "may not match the vehicle's true direction of travel." The camera and radar also aim along the line the car drives, and Mevotech's tech sheet says a thrust angle out of specification "may also impact the correct operation of ADAS features."
Honda puts the limits plainly. Its job aid "Aiming Driving Support Systems" says: "Unless instructed by the service manual or available service information, camera and radar systems calibrations are NOT required after a wheel alignment." The same job aid sets the order in its collision procedure: if the wheel alignment is out, "it must be corrected before aiming/calibrating any camera or radar." New tyres matter when the rolling diameter changes, because that changes ride height; Modern Tire Dealer quotes Bosch on tyre size and the sensors' view. Our page on ADAS calibration after wheel alignment goes through the checks car by car.
An owner in the South West had a wheel alignment done, and afterwards the car pulled to the left whenever lane keep assist was on. The ADAS hadn't been calibrated at the alignment, because the garage didn't have the target boards. The enquiry doesn't say whether the maker's procedure called for boards on this car.
10.1% of cases, 8 enquiries, followed suspension work: new arms, springs or bushes, or lowering springs.
The camera and radar store their up and down angle against the body at factory ride height. Lower or lift the car and they look higher or lower than the software thinks. A TRL report on ADAS calibration on modified vehicles says ADAS performance "is reported to be altered when vehicle ride-height/rake-angle is changed because the electronic orientation of the sensor in the software has a different frame of reference." Equipment maker TEXA, quoted by Modern Tire Dealer, goes further: "If the vehicle height is altered, an ADAS calibration is required to adjust all the sensor visibilities." Makers set their own rules per model; Toyota's campaign instructions screen for a suspension lift kit as a modification with its own procedure.
Like-for-like arms and bushes don't change ride height. Mevotech's tech sheet still warns that "replacing a suspension component may create a condition where sensors do not "agree"." The usual check after that work is an alignment, plus a steering angle reset if the toe moved.
A Nissan owner in the South East had work done on a wishbone and its bushes, followed by a wheel alignment. A warning light with a crash symbol and a system fault stayed on, and the sensor went off when it shouldn't. They were advised it might need a calibration.
22.8% of cases, 18 enquiries, followed an accessory or cosmetic change, a software update or another routine job.
The front radar sees through set areas of plastic, usually the badge or the grille. Honda's job aid says radar covers "should never be painted or wrapped with exterior covering as it will obstruct the radar view." It also warns that "Depending on the trim level, the grille or the front Honda emblem base is different and can obstruct the radar view if the wrong one is installed." A badge that isn't radar-transparent blocks the signal the same way paint or wrap does, which is why a badge swap can switch Front Assist off. Volkswagen drivers can read our page on Front Assist after a badge swap.
"I swapped out the VW badges for black ones and have had warning light for no front assist since then"
Volkswagen owner, Yorkshire and the Humber
At the back, a tow hitch can echo the rear radar, as Ford's blind spot bulletin found. A towbar often needs coding too, so the car's modules know it's there; Car Lock Systems, which makes coding tools, links uncoded towbars to ADAS faults. Coding and calibration are separate jobs. Coding changes the car's settings. Calibration aims a sensor.
"when i had my towbar fitted the coding went wrong and now this error is active"
SEAT owner, East Midlands
Software counts as well. Genesis's "Front Radar Software Update for DTC C1620" says: "After the front radar software update, system recalibration MUST be performed."
VW Group cars account for 41 of the 79 routine-job cases, or 51.9%. Among the other 846 enquiries in the same sample, VW Group's share is 38.7%, and across all 925 it's 39.8%. Volkswagen alone made up 31.6% of the cases (25), against 18.4% of the rest.
Among ad-evidenced enquiries, VW Group cars made up 51.9% of the 52 routine-job cases against 39.2% of the other 571. VW Group's share of all organic enquiries (37.8%) is no higher than of ad-evidenced ones (40.3%), so the organic side isn't more VW-heavy. The organic routine-job cases are too few to split by make here.
The jobs differ by make. Of the 24 repairs away from the sensors, 18 were on VW Group cars, and 13 of the 18 badge, grille and accessory jobs were too. Of the 19 wheel, tyre and alignment jobs, 14 were on other makes. The VW Group repairs customers named include air con work, a radiator, a headlamp, bonnet cables and latches, steering wheel work, a gearbox unit, a drive shaft and ABS wheel speed sensors.
On many VW Group models the front radar sits behind the badge or in the grille. A US Volkswagen tech tip covering one model, "Adaptive Cruise Control DTC C110300 Resulting from Grille Removal", says that when the front grille "is disturbed or replaced, the Adaptive Cruise Control (ACC) Calibrating process is required as a consequential repair." Front-end repairs such as a radiator, a condenser or a headlamp can mean unbolting the bracket or the support the radar is mounted to.
"The bumper was removed to replace a headlamp"
Volkswagen owner, West Midlands
"Vehicle has had new air con condenser fitted now has fault with front assist"
Volkswagen owner, Scotland
The case count is small: 41 VW Group cases and 38 on other makes. The make split for battery or electrical work and for suspension is withheld, because the VW Group side of each split falls under 5 cases, and both sides are withheld together. The VW Group figure is worth testing on a bigger sample before anyone calls it a pattern.
Across all makes, 24 cases followed a repair away from the sensors (30.4%) and 19 followed wheel alignment, tracking, tyres or wheels (24.1%). The gap is small enough that another year of enquiries could reverse it.
Trade guidance to drivers points at alignment, suspension and tyres. The IMI's ADAS consumer report says calibration can be needed after "a common operation such as windscreen replacement, suspension repairs and wheel alignment". ATS Euromaster, via Tyrepress, tells fleets to "consider recalibration work in any SMR undertaken on a vehicle that might affect the proper functioning of the affected safety system." Neither names a radiator, a condenser or a headlamp. Those are the jobs a garage books as something else.
The routine-job share holds across sources. Among ad-evidenced enquiries, 8.3% followed a routine job, and among organic enquiries 9.2%. This release doesn't publish the job mix by source.
The booking form asks what work was done. 35.4% of these customers picked "Other", the largest answer.
n = 79 cases · the answer each customer picked for the work done · 3 October 2025 to 6 October 2026
Our booking form asks what work was done and offers a short list: a windscreen, parts removed or replaced, a collision or bumper repair, and a warning light. It doesn't name batteries, alignment, suspension, towbars or a gearbox. 35.4% of these customers picked "Other" (28), the largest answer. 25.3% picked a warning light (20) and 25.3% picked parts removed or replaced (20). The remaining 13.9% left it blank or picked another answer (11).
For a garage reading a booking, "Other" or "warning light" says little. The job that came first is usually in the customer's own words, if it's anywhere. Ask what work the car had in the weeks before the light came on. A battery swap, a set of tyres or a bumper off to reach a headlamp is easy to leave out when nobody said it mattered. If the warning is Front Assist unavailable, the recent work is the first thing to check.
Thatcham Research's UK Insurance Industry Requirements for the safe repair of ADAS equipped vehicles set the rule: "Inspection, realignment and calibration requirements must be considered in all repair situations where ANY of the following is included within the repair, service or maintenance procedure:" ADAS sensors, parts likely to affect the operation and functionality of ADAS sensors, or vehicle geometry.
The sample. Every kept enquiry to ADAS Line with a written message of 20 or more characters, from 3 October 2025 to 6 October 2026. That's 925 enquiries of the 1,134 kept in the window. Test submissions and repeats within 24 hours were removed first.
Sources. 623 enquiries carry evidence of a click on a Google Ads campaign and 185 came from organic search. The rest couldn't be tied to a source. Paid Google Ads ended on 28 September 2026, so later enquiries are organic. VW Group's share was 40.3% of ad-evidenced enquiries and 37.8% of organic ones.
Labelling. An AI model labelled each enquiry under written definitions, version themes-1.0, from the form answers and the customer's own words. A second model, different from the one that did the labelling, then labelled a random sample of 50 blind as a check. The two agreed on 48 of them on whether a routine job was present, and the first labels were kept. A second blind check drew 150 enquiries, all 79 routine-job cases mixed at random with others, and a different model labelled the job. It agreed on whether a routine job was present in 145 of them, and on the job group in 76 of the 79 cases.
What counts as a routine job. The customer names a job or event as the reason for the enquiry, and that job didn't involve a crash, a kerb or pothole strike, a windscreen, a bumper or bodywork repair, or an ADAS part being replaced or refitted. A sensor, camera, radar, control module or camera windscreen is an ADAS part. A badge, grille or bracket that only holds or covers one isn't, so its replacement counts here. A bumper taken off only to reach something else counts when the customer frames it as the other job, so "bumper removed to replace a headlamp" is a headlamp job. When a label was in doubt, the enquiry was left out.
Groups. Wheel alignment and tracking are merged with tyres and wheels. Accessories and cosmetic changes are merged with software updates and other routine jobs. VW Group covers Volkswagen, Audi, Škoda, SEAT, Cupra and Porsche. Any figure under 5 cases is withheld. For battery work and suspension, the VW Group side of the make split falls under that floor, so both sides are withheld together.
Cross-check. The UK ADAS Calibration Report 2026 used a different sample and window. Of the enquiries in that sample with a written message, 48 of 553 carry a routine job under these definitions, or 8.7%.
Limits. This is one provider's data. It only covers people who searched, found us and enquired. A customer naming a job tells us what came before the fault. It doesn't prove the job caused it.
October 2026: first release. 925 enquiries, 3 October 2025 to 6 October 2026.
Journalists, researchers and industry professionals are welcome to cite any figure in this report.
ADAS Line, "Hidden ADAS Calibration Triggers 2026," October 2026 release. https://adasline.co.uk/research/hidden-adas-calibration-triggers-2026
The figures are in the data file (CSV), and the charts are available as images: the jobs and the booking form answers. The make-group split is in the CSV only.
For press enquiries, contact info@adasline.co.uk.
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