When the safety features you paid for don’t work when you need them—like forward-collision warnings that trigger randomly or blind-spot alerts that go silent—trust in your car takes a hit. In California, problems with safety sensors can fall under the state’s lemon law if they persist under warranty and substantially affect your vehicle’s use, value, or safety. This article explains how the law may apply to unreliable safety sensors and what records to keep so you can make informed decisions about next steps.
How California Lemon Law Covers Unreliable Safety Sensors
California’s lemon law (the Song-Beverly Consumer Warranty Act) generally applies to new and certain used vehicles sold or leased in the state with a manufacturer’s warranty. If your car’s safety sensors—such as forward collision, lane keeping, blind-spot monitoring, or airbag sensors—malfunction repeatedly and the dealer can’t fix them after a reasonable number of attempts, you may have rights under the law. “Reasonable” depends on the facts, but California has a guideline during the first 18 months or 18,000 miles: four or more repair attempts for the same issue, two or more attempts if the problem is likely to cause death or serious injury, or more than 30 cumulative days out of service.
Safety sensor defects can “substantially impair” safety even if the car still runs. For example, a vehicle that unexpectedly slams the brakes due to false collision alerts, or one that fails to warn when a car sits in your blind spot, can undermine driver confidence and increase risk. Intermittent problems count too—especially when they recur under similar conditions and the dealer documents the concern during warranty.
If your car qualifies, possible remedies under the lemon law can include a repurchase (refund with a mileage offset), a replacement vehicle, and reimbursement for certain incidental costs like towing or rental cars. Outcomes vary based on evidence and warranty coverage, and some manufacturers offer arbitration programs you can choose—but you are not required to accept an outcome that doesn’t align with your rights. The key is building a clear paper trail that shows consistent, unfixable sensor problems while the vehicle is under warranty.
Common Safety Sensor Failures and Records to Keep
Modern vehicles rely on cameras, radar, lidar, ultrasonic sensors, and software. Common issues include frequent “Sensor Blocked” or “Camera Unavailable” messages in normal weather, false automatic emergency braking, lane-keeping that ping-pongs or pulls you toward lines, blind-spot lights that fail to illuminate, cross-traffic alerts that don’t detect approaching cars, and airbag or occupant detection warnings that persist. Other red flags: adaptive cruise that disengages without cause, pedestrian detection errors, and repeated post-repair “calibration required” notices.
Because sensor issues can be intermittent, documentation is crucial. Save every repair order and invoice, even if it says “no problem found.” Note the dates, mileage, weather, lighting, road type, and speed when warnings triggered. Photos or short videos of dashboard messages can help, as can screenshots of app notifications, service reminders, or over-the-air update alerts.
Ask the service advisor to write your exact complaint on the work order, including when, where, and how the issue occurs. Request copies of calibration reports, alignment specs, and software version numbers after each visit. Track time out of service, loaner usage, and any costs you incur—towing, rentals, rideshare—because those may be relevant to potential reimbursement under the law.
Sensor problems can turn advanced safety tech from a selling point into a daily stressor. If your California vehicle keeps having safety sensor issues under warranty—and the dealer can’t seem to fix them—learning your rights under the lemon law is a smart step. This article is for general information only, not legal advice, and reading it does not create an attorney-client relationship.
Every situation is unique. A consultation can help you understand how the law applies to your facts, your warranty, and your repair history. To talk through your options, contact ZapLemon at www.ZapLemon.com.
Attorney Advertising. Past results do not guarantee future outcomes. If you believe your vehicle may qualify as a lemon, contact ZapLemon at www.ZapLemon.com to request a consultation.