Lemon Car Lawyers: Arbitration Evidence Checklist

When a new or certified used car keeps going back to the shop, many California drivers consider manufacturer arbitration before thinking about a lawsuit. Arbitration is a more informal process, but it still turns on evidence. This ZapLemon guide walks you through a practical “Lemon Car Lawyers: Arbitration Evidence Checklist” so you can understand what information typically matters, how to organize it, and what arbitrators often focus on in California lemon cases. This article is for general information only and is not legal advice.

Arbitration Evidence Checklist for Lemon Cars

Before any hearing, assemble the core vehicle and warranty documents. That usually means your purchase or lease contract, financing paperwork, registration, and title or lease assignment. Include the full warranty booklet and any extended service contracts so it’s clear what coverage applied when the problem appeared. If you have the window sticker (Monroney label), keep it with your file—option packages and MSRP sometimes help confirm the exact model and features tied to a defect.

Next, gather every service record related to the defect. That includes repair orders, invoices, diagnostic printouts, recall and service campaign notices, and any loaner or rental agreements that show the days your car was unavailable. Be sure the repair orders reflect your actual complaint in your own words (“vehicle stalls at highway speeds” or “brake pedal sinks to floor”) and the dates and mileage in and out. Supplement with photos or videos of the symptoms, tow receipts, dash light pictures, OBD code screenshots, and a simple log that totals days out of service. If the problem affects safety, note any near-misses, warning messages, or loss-of-power incidents.

Round out the file with communications and context. Save emails, text messages, and portal messages with the dealer or manufacturer, case numbers from customer care, and notes from phone calls (date, who you spoke with, what was said). Include any Technical Service Bulletins (TSBs) you were given, proof of routine maintenance (to show proper care), and information about accessories or modifications (so it’s clear they didn’t cause the defect). Create a brief chronology—by date and mileage—showing when the defect started, each repair attempt, and the current status. Keep everything organized in a single PDF or binder with tabs, and bring two copies in case the arbitrator or manufacturer representative needs one.

Proof Arbitrators Want in California Lemon Cases

Arbitrators generally look for clear, consistent proof of three things: a defect covered by warranty, a reasonable number of unsuccessful repair attempts (or significant days out of service), and that the problem substantially impairs use, value, or safety. They are not expecting legal jargon—they are looking for credible documentation tied to specific dates and mileage. A concise timeline and matching paperwork often speak louder than long explanations.

California’s lemon law (often called the Song-Beverly Consumer Warranty Act) includes a “presumption” that can apply early in a vehicle’s life. While every case is different, commonly cited thresholds look at repeated attempts to repair the same defect, whether the issue is likely to cause serious injury, or whether the vehicle was out of service for 30 or more days for warranty repair within the first 18 months or 18,000 miles. These are presumptions, not hard-and-fast rules, and programs may weigh them differently—your documents help the arbitrator decide how they apply.

Beyond repair count and downtime, arbitrators examine whether you gave the manufacturer a fair opportunity to fix the problem, whether the symptoms are recurrent or escalating, and whether the defect affects everyday use or safety (for example, sudden loss of power, brake issues, stalling, steering problems, persistent leaks, or unresolved electrical faults). Evidence like consistent complaint descriptions on repair orders, photos or videos of the condition, rental or tow receipts showing inconvenience, and maintenance records showing proper care all strengthen your presentation. If you installed aftermarket parts, be ready to show they aren’t related to the defect. Expert reports are not always required in arbitration, but organized, first-hand documentation from you carries real weight.