Modern cars lean on radar sensors to power features like adaptive cruise control, automatic emergency braking, and blind-spot monitoring. When those sensors act up, the results can be frustrating—and unsafe. If your vehicle’s radar systems keep failing under warranty, you may be wondering whether California’s Lemon Law can help. This article explains common safety risks and symptoms of faulty radar sensors and outlines when repeated sensor problems might qualify under California’s Lemon Law. It’s educational information, not legal advice.
Faulty Radar Sensors: Safety Risks and Symptoms
Radar sensors sit behind bumpers and grills, scanning traffic to keep distance, warn of collisions, and assist with braking and steering. When they malfunction, the most serious risk is inconsistent or incorrect driver-assistance behavior. That can look like sudden “phantom braking,” delayed or no braking when a collision is imminent, or adaptive cruise that surges or drops out without warning. Any defect that interferes with a driver’s ability to predict how the car will behave can meaningfully impact safety.
Drivers often notice warning lights or messages such as “Front Radar Unavailable,” “Collision Mitigation System Disabled,” or “Cruise Control Not Available.” You might also experience frequent disengagement of adaptive cruise control, lane-centering that won’t activate, or blind-spot warnings that flicker or disappear. Some issues are intermittent—working fine one day and failing the next—which makes documenting the problem especially important for warranty repair discussions.
Faults can stem from misaligned sensors after a minor fender-bender or windshield/bumper work, software glitches that require updates, wiring or connector issues, or obstructions like emblem covers and aftermarket accessories. Weather can trigger faults, but persistent errors in normal conditions are a red flag. If your dealer keeps replacing parts or recalibrating sensors and the warnings return, you’re dealing with more than “quirks”—you may be confronting a defect that impairs use, value, or safety.
When Do Faulty Sensors Qualify Under CA Lemon Law?
California’s Lemon Law (the Song-Beverly Consumer Warranty Act) generally applies when a manufacturer cannot repair a vehicle defect covered by the warranty after a reasonable number of attempts, and the defect substantially impairs the car’s use, value, or safety. Radar sensor defects can fit this framework because unpredictable braking or disabled collision-avoidance systems go directly to safety. The key questions are whether the problem is covered by the manufacturer’s warranty and whether it significantly affects use, value, or safety.
California also has a “presumption” that helps consumers in the first 18 months or 18,000 miles (whichever comes first): the law presumes a vehicle is a lemon if, during that early period, the manufacturer makes four or more repair attempts for the same problem, or two or more attempts for a defect likely to cause serious bodily injury or death, or if the car is out of service for more than 30 cumulative days for warranty repairs. Many radar-related issues—like repeated failures of automatic emergency braking or unpredictable braking—may fall within the safety category. Even if you’re outside the “presumption” window, you may still have rights under the Lemon Law; it just won’t be presumed, and the overall repair history matters.
Practical steps help protect your claim: keep all repair orders and note the exact complaints you reported (e.g., “phantom braking at 65 mph,” “AEB disabled message returns daily”). Ask the dealer to note any fault codes, calibrations performed, and parts replaced, and save photos or short videos of warnings on the dash. Check for recalls or Technical Service Bulletins (TSBs), and confirm you’re within warranty. If you’re experiencing repeated sensor failures or long stretches in the shop, consider consulting a California lemon law attorney to review your records and discuss options. A consultation is needed for legal advice.
Faulty radar sensors aren’t just annoying—they can undermine the safety features your car is supposed to provide. If your vehicle has repeated ADAS or radar sensor problems under warranty, California’s Lemon Law may offer remedies, depending on your specific facts and repair history. Keep detailed records, work through authorized repairs, and get a professional review if the issues persist.
Disclaimer: This article is for informational purposes only and is not legal advice. Reading it does not create an attorney-client relationship. Every case is different; consult an attorney for advice about your situation. If you believe your vehicle may qualify as a lemon, contact ZapLemon at (844) 927-5366 or visit https://zaplemon.com to request a consultation.