A customer once handed me a dealer estimate for $2,300 to “fix the auto brake system” on a three-year-old crossover. The actual problem was a fingernail of dried bug splatter over the front radar. I wiped it off, cleared the code, and sent her home for the price of a shop rag. Not every automatic emergency braking fault ends that cheaply, but the gap between the scary quote and the real repair is often enormous.
I have chased these faults on Toyotas, Hondas, Subarus, and a fair number of German cars over the years. Let me give you honest numbers so the next quote you get does not feel like a shakedown.
Key takeaways
- Most AEB faults start as a blocked or dirty sensor, and cleaning it can cost nothing.
- A front radar module runs $400 to $1,300 in parts, with luxury brands climbing higher.
- Calibration after any sensor or windshield work usually adds $150 to $500, and skipping it is dangerous.
- Diagnosis first, parts second. Ask for the fault code before you approve a single dollar of replacement.
Start with what usually breaks
Automatic emergency braking, or AEB, is the feature that hits the brakes for you when a crash is coming and you have not reacted. It leans on a front radar unit, a windshield camera, or both working together. Systems like Toyota Pre-Collision System, Honda CMBS, and Subaru EyeSight all use some flavor of this hardware.
Here is the good news no service writer leads with: the most common reason AEB faults out is not a dead part. It is a blocked sensor. Snow, road film, a stick-on plate frame, or a shop-applied bumper decal in front of the radar will disable the whole system.
Tip
Before you pay anyone, clean the front emblem area and the top-center of your windshield, then drive a few miles. If your AEB turned itself off warning clears, you just saved several hundred dollars for the cost of a wipe.
What you are actually paying for
When AEB genuinely needs repair, your bill breaks into three buckets: diagnosis, the part itself, and calibration. Understanding which one applies to you is how you avoid overpaying.
Diagnosis is the scan that pulls the fault code and tells the tech whether the radar is blind, misaligned, or actually failed. The part might be a radar module, a camera, or in cheaper cases a connector or fuse. Calibration is the final step that aims and teaches the sensor its exact position so the car brakes at the right moment.
| Repair | Typical cost | What it involves |
|---|---|---|
| Sensor cleaning | $0 to $60 | Removing snow, film, stickers, or a blocking plate frame |
| Diagnostic scan | $80 to $180 | Pulling fault codes to find the real cause |
| Camera or radar calibration only | $150 to $500 | Static or dynamic aiming after work is done |
| Front radar module replacement | $500 to $1,500+ | Part plus labor plus calibration |
| Windshield camera replacement | $450 to $1,200 | Camera, sometimes with glass, plus calibration |
Notice the range on that last row. A base Corolla camera is a different animal from a Lexus or Audi unit, and dealer-only parts push the top end fast.
Watch out
A “replace the radar” quote written before anyone pulls a code is a red flag. I have seen misaligned radars from a minor bumper tap get quoted as full replacements when a calibration would have fixed them. Insist on the fault code in writing first.
Parts cost by brand tier
Radar and camera pricing tracks the brand. Mainstream Japanese and domestic modules sit lower. German and premium units climb hard, partly because the dealer is often the only reliable source and the software handshake is locked to the VIN.
| Brand tier | Front radar or camera part | Notes |
|---|---|---|
| Toyota, Honda, Mazda | $400 to $800 | Some units available aftermarket |
| Ford, Chevy, Hyundai, Kia | $450 to $900 | Mostly OEM, occasional reman option |
| Subaru, Nissan | $500 to $1,000 | EyeSight is a dual-camera stereo unit, priced high |
| BMW, Audi, Mercedes, Lexus | $800 to $1,600 | Dealer-only on many model years |
Those are parts alone. Subaru EyeSight deserves a special note because its stereo camera assembly lives behind the windshield and is genuinely pricey to replace and calibrate. If you drive one, our Subaru EyeSight pre-collision braking guide explains why that hardware costs what it does.
Labor: what a tech charges to swap it
Front radar modules usually mount behind the grille or lower bumper, so reaching one often means pulling a fascia panel or a section of trim. On most sedans and crossovers that is a 1 to 2 hour job. Windshield-mounted cameras are quicker to physically access but tangle up with the glass and calibration.
At an independent shop billing $110 to $160 an hour, plan on $150 to $350 in labor for a straightforward sensor swap. Dealership rates commonly run $160 to $220 an hour, so the same work reads higher on their invoice.
- Confirm the fault is the sensor, not a chafed harness or blown fuse, before authorizing parts.
- Ask whether the quote includes calibration or lists it as a separate line.
- Get the part number in writing so you can verify it is VIN-correct.
- Check whether one shop can do both the replacement and the calibration in-house.
That first bullet saves people real money. More than once a “dead radar” turned out to be a corroded connector after a fender repair, a fraction of the cost of a module.
Calibration: the fee people forget
Here is the step drivers do not budget for. Bolting in a new radar or camera is not the finish line. The car has to relearn the exact aim and position of that sensor, a process called calibration. Get it wrong and the system either brakes at phantoms or, far worse, stays quiet when it should stop you.
An uncalibrated emergency braking system is not a safety feature. It is a guess bolted to your bumper.
Some brands calibrate dynamically, where a tech drives a set route while a scan tool watches the sensor learn. Others need static setup with targets on a level floor. Either way, expect $150 to $500 depending on brand and equipment. Calibration is also why a simple windshield replacement can trigger an AEB fault, since moving the camera even slightly throws off its aim.
Good to know
If your warning appeared right after new glass went in, the camera almost certainly needs recalibration, not replacement. The same logic applies to why a car brakes for no reason, which is frequently a miscalibrated or confused sensor rather than a broken one.
Real-world total examples
Rolling diagnosis, parts, labor, and calibration together, here is what recent jobs actually cost drivers I worked with.
A 2020 Toyota RAV4 with a Pre-Collision System fault after a light front tap: $180 diagnosis, $620 radar, $220 labor, $200 dynamic calibration. Out the door near $1,220. A 2019 Honda CR-V with a CMBS camera fault after a windshield swap needed calibration only, about $300 total.
The eye-opener was a 2021 Audi Q5 where the dealer replaced the front radar and did static calibration for roughly $2,100. Same style of failure, wildly different bill, entirely because of the brand.
How to spend less without cutting corners
You can trim this honestly. Start by ruling out the free fixes, because a blocked or dirty sensor mimics a failed one constantly. Our guide to mistakes that disable city braking support covers the everyday habits that trip these systems for no real reason.
If the sensor truly is dead, price a quality OEM-equivalent part against dealer pricing, and get a calibration quote from an independent ADAS shop. Independents with the right scan tools often beat dealer calibration fees by a wide margin. And if the damage came from a collision, get the sensor and its calibration written into the insurance claim rather than paying out of pocket later.
For the full picture of how this feature works and when a dashboard light signals a real repair, keep our guide to automatic emergency braking handy, and check the symbols in our AEB warning lights and symbols chart so you know what your dash is telling you. For an independent look at how these systems are meant to perform, the testing summaries at the IIHS driver assistance resource are a solid reference.
The honest range for a complete AEB repair spans from free, when it is only a blocked sensor, up past $2,000 for a luxury radar with static calibration. Get the fault code first, know which of the three costs you are being charged for, and never let a suspiciously large quote skip the cheap fixes it should have tried.
Questions drivers ask
The most common cause is a blocked sensor. Snow, road film, a plate frame, or a bumper sticker over the front radar or camera will disable the system. Cleaning the sensor area often clears the fault for free.
A front radar module runs about $400 to $1,300 in parts on mainstream vehicles, more on luxury brands. Add labor of $150 to $350 and calibration of $150 to $500, so a complete job often lands between $800 and $1,600.
Calibration teaches the car the exact aim and position of the new radar or camera. Without it the system can brake at the wrong moment, so most shops charge $150 to $500 for it as a separate line item.
For a blockage or a scan, an independent shop is fine and often faster. For a full radar or camera replacement on a newer car, use a dealer or an ADAS-focused shop that can prove it has the correct calibration equipment.
Some manufacturers cover AEB sensor faults under the safety or powertrain warranty for the first few years. Check your coverage before paying, since a covered radar can turn a four-figure quote into zero.
