Showing 'Clean Front Radar' or 'Front Radar System Blocked' on your Hyundai? Cleaning the bumper rarely clears it. The radar behind the front emblem on your Tucson or Kona has lost its aim by a fraction of a degree, and Forward Collision-Avoidance Assist, Smart Cruise and Lane Keeping all read from it. Here's what's actually happening, and what the recalibration costs.
You can drive the car. Forward Collision-Avoidance Assist, Smart Cruise Control and Lane Keeping Assist are offline until the radar's recalibrated. Normal brakes, steering and conventional cruise all still work. Leave more following distance and treat the SmartSense suite as not there until it's sorted.
The radar's behind the front emblem on most Hyundai models, aimed to a tolerance most owners underestimate. Here's what we see shifting that aim, in roughly the order we see them in real enquiries.
The hardware's fine. The aim isn't. A fraction of a degree off horizontal and the car flags 'obstructed' because that's the message it has, not because it's diagnosed contamination. This is the underlying mechanism on almost every case.
The trigger we see most often. A repaired bumper that's gone back on slightly differently, a new grille, even a respray over the radar area changes the carrier geometry. The radar moves with it, and SmartSense drops out.
Hyundai bumpers carry the radar and the parking sensors close together. If the bumper took a knock that bothered one, it likely bothered the other. Note whether parking sensors are showing a fault too. It confirms the trigger.
Body shops sort the panels and paint, but ADAS calibration is a separate job, and it's the step that often gets missed. The fault may not appear straight after the repair, sometimes weeks or months later when the system runs a more thorough self-check.
Trolley contact in a car park, a curb strike on the lower bumper trim, a hard parking sensor brush. None of those leave visible damage, but any of them can shift the radar bracket enough to throw the fault.
On the Kona and IONIQ, the toe angle change from a wheel alignment can subtly shift the car's reference relative to the radar. Worth flagging if the warning started after suspension or alignment work, not bumper work.
If the bumper repair followed a real impact, the radar housing or its bracket may be cracked, not just knocked. Calibration won't hold on damaged hardware. A diagnostic scan tells you which before any work is booked.
Worth checking first: confirm whether the parking sensors are flagging too, and look along the front bumper for uneven gaps or a cracked clip. If 'Clean Front Radar' or 'Front Radar System Blocked' is still showing, the radar needs recalibrating.
On a Hyundai that means a static procedure. The workshop sets a manufacturer-spec radar target board at the correct distance, runs the alignment routine through HKMC-capable diagnostics, and clears the fault codes including the Forward Collision-Avoidance Assist warning.
It's a fixed £349 through our network: scan, calibration, certificate. If the scan shows the radar was damaged in the impact and needs replacing, you'll know the cost before any work goes ahead. There's no charge for the diagnostic if you decide not to go ahead. The full procedure is in our ADAS calibration guide.
Pricing is fixed across our network. Same price wherever you are in the UK. Your tier is set by what work has been done, not by your postcode or your car's make.
All prices include the diagnostic scan, the calibration procedure (static, dynamic, or both as required), a post-calibration check, and a calibration certificate. No charge for diagnostic if you decide not to proceed.
Send your registration and a line on what's happened. We'll come back with the fixed price, the nearest accredited workshop, and the soonest available slot.
Because in our operational experience the trigger is almost never dirt. The radar behind your front emblem is aimed to a fraction of a degree, and even a minor parking knock or a refitted bumper from a previous repair shifts that aim enough to flag the fault.
The car shows 'Clean Front Radar' because that's the message it has, not because it's diagnosed contamination. The warning will come back on every ignition cycle until the radar is recalibrated.
Radar calibration is a fixed £349 across our accredited network, the same wherever you are in the UK. That covers the diagnostic scan, the calibration itself, and a calibration certificate. One session covers up to three ADAS systems, so if Smart Cruise Control or Lane Keeping Assist have dropped out alongside the radar, they're done together.
Four out of every five Hyundai radar enquiries we see are Kona. The Kona's bumper geometry sits the radar closer to the road than on the Tucson or IONIQ, which makes it more susceptible to minor parking knocks and curb strikes. Same calibration job, just a more common trigger.
No. Any workshop with HKMC-capable diagnostic equipment and a calibration bay can do it, and our accredited network is set up for that. The dealer will charge their own labour rate for the same procedure. The certificate we issue is accepted by insurers and sits on the car's service history.
Same radar, different warning text. Often appears alongside the radar fault on Hyundai.
Bumper work is the trigger we see most often on Hyundai. The cross-make guide if that's your case.