Start with the records. Repair orders, warranty documents, mileage, and days out of service are more useful than general assumptions about whether a vehicle qualifies.
Radar-based driver assist systems are now standard on many vehicles, powering features like adaptive cruise control, automatic emergency braking, and blind spot monitoring. When those radar sensors fail or won’t calibrate, the result can be persistent warning lights, safety features that shut off, or even “phantom braking.” This article explains how California’s lemon law can apply to radar sensor defects and when it makes sense to contact ZapLemon for a consultation about ongoing calibration problems.
Radar Sensor Failures Under California Lemon Law
Modern vehicles often use front or rear radar units hidden behind the bumper cover or grille to detect other cars and obstacles. When a radar sensor is misaligned, obstructed, or defective, drivers may see messages like “Front Radar Unavailable,” “ADAS Malfunction,” or “Collision Mitigation System Disabled.” Common symptoms include intermittent shutdowns after rain, false collision alerts, or adaptive cruise that abruptly disengages. These issues can undermine confidence in the car and raise real safety concerns, especially on highways.
California’s lemon law (part of the Song-Beverly Consumer Warranty Act) generally protects consumers when a vehicle has a defect covered by the manufacturer’s warranty that the dealer can’t fix after a reasonable number of attempts, or when the vehicle spends a certain amount of time out of service for repairs. Safety-related problems may require fewer attempts, but every situation turns on its facts, including how severe and frequent the defect is and whether it substantially impairs the use, value, or safety of the vehicle. Radar issues can be tricky because the fix may involve both hardware and software, plus precise calibration to manufacturer specifications.
In practice, recurring radar trouble often looks like repeated “calibration complete” visits followed by the same warnings returning within days, sensor replacements that don’t stick, or software updates that help briefly and then the problem comes back. Related repair lines may include replacing the radar module, brackets, bumper cover, wiring, or windshield; performing static or dynamic calibration; updating control unit software; or addressing alignment and ride height. Technical Service Bulletins (TSBs) or recalls may exist for certain models. Not every radar complaint qualifies as a lemon, but thorough documentation and a clear repair history can help you understand your options.
When to Contact ZapLemon About Radar Calibration
Calibration is required after many events: windshield replacement, front-end body work, suspension or ride-height changes, or even routine alignments on some models. Signs that calibration wasn’t performed or didn’t hold include recurring dashboard warnings, ADAS features that shut off after a short drive, or the system only working in perfect weather. If you’ve made several warranty visits for radar faults or calibration and the issue keeps returning, it may be time to talk with a California lemon law firm like ZapLemon to review your situation.
Actionable steps can strengthen your position. Ask for complete repair orders every visit, including diagnostic codes, software versions, and whether the calibration was static or dynamic. Request the calibration certificate, pre- and post-scan reports, and alignment specs when relevant. Keep photos of warning messages, note mileage and dates out of service, and save receipts for rentals or towing. If you paid out-of-pocket for calibration after an insurance repair, hold onto those invoices. Also check for TSBs or recalls, confirm that aftermarket accessories aren’t blocking the radar, and consider a second opinion from an authorized dealer if the problem persists.
ZapLemon can help you evaluate whether your recurring radar sensor or calibration problems might meet California’s lemon law criteria, explain available remedies under the law, and discuss next steps tailored to your facts. Outcomes vary, and no firm can guarantee a specific result without reviewing your records, but a consultation can clarify your rights and timeline. If you’re dealing with repeated radar failures, persistent calibration struggles, or long stretches without your car, reaching out early can help you understand your options and plan your next move.
Need a case-specific review?
Use the case-review form to share the warranty, repair orders, dates, mileage, and supporting facts an attorney would need to evaluate, or call (844) 927-5366.
Attorney advertising. General information is not legal advice and does not create an attorney-client relationship. No result is promised or guaranteed.