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.
If your new car’s parking sensors were glitching, inoperable, or throwing warnings from the moment you drove off the lot, you are not alone. Many California drivers discover Advanced Driver Assistance Systems (ADAS) issues—like defective parking assist, proximity alarms, or cross-traffic alerts—right at delivery. This article explains, in plain language, how California’s Lemon Law may apply to parking sensor defects that show up on day one, and what practical steps you can take to document the problem and protect your rights.
Parking sensors fail at delivery: California Lemon Law
Parking sensors are part of many vehicles’ ADAS suites. When they fail at delivery—beeping constantly, not detecting obstacles, throwing “sensor blocked” or “park assist unavailable” messages, or working intermittently—that can indicate a “nonconformity” under California’s Lemon Law (the Song-Beverly Consumer Warranty Act). A nonconformity is a defect covered by the manufacturer’s warranty that substantially impairs the vehicle’s use, value, or safety. Even though parking sensors seem minor, they can affect low-speed crash avoidance and overall value, especially on vehicles sold with premium driver-assist features.
California Lemon Law generally requires that the manufacturer get a reasonable number of opportunities to repair a warranty defect. The law’s “lemon law presumption” may apply within the first 18 months or 18,000 miles (whichever comes first) if certain thresholds are met, such as multiple unsuccessful repair attempts for the same issue or the vehicle being out of service for 30 or more cumulative days for warranty repairs. While the presumption offers a helpful framework, your rights do not disappear after those mile or time markers; every case depends on facts like repair history, warranty coverage, and how the defect impacts use, value, or safety.
If the sensors were defective at delivery, ask the dealership to document it immediately. A “due bill” or “we owe” slip noting the specific sensor problem, plus details on your purchase documents, can help show the issue existed at the time of sale. For used or certified pre-owned vehicles, the Lemon Law can still apply if the manufacturer’s warranty is in effect. Keep in mind: this information is for educational purposes only—ZapLemon can evaluate your situation and explain potential options based on your particular facts and warranty records.
Repairs, records, next steps under California Lemon Law
Start by scheduling a warranty repair with an authorized dealer as soon as you notice a sensor failure. Clearly describe the symptoms (for example, “rear sensors do not detect obstacles,” “false alerts when no objects are present,” or “park assist disabled after 5 minutes”). Ask that the repair order include your complaint in your own words, any warning lights or dash messages, and the technician’s findings and codes. Save every repair order, invoice, and work summary—even when “no fault found” is written—because each visit helps establish a pattern.
Document the defect outside the shop, too. Short videos showing the malfunction, screenshots of warnings in your dash or app, dates and mileage when the problem occurs, and notes about weather or parking conditions can all be useful. If the vehicle spends time in the shop, track the days out of service. Avoid clearing codes or disconnecting the battery before service, as this can erase data that helps technicians and may complicate your record. If you experience recurrent issues, ask for a case number from the manufacturer and keep all correspondence.
If repairs don’t resolve the problem after a reasonable number of attempts, you may have options under California Lemon Law, which can include repurchase or replacement in qualifying cases. Some manufacturers offer dispute-resolution programs or arbitration; these processes have pros and cons, and timelines can vary. Because outcomes depend on specific facts and warranty terms, consider contacting ZapLemon for a consultation to review your repair history, warranty coverage, and next steps. We can also discuss general best practices, like checking for relevant technical service bulletins (TSBs) and ensuring dealer software updates and sensor calibrations are performed.
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.