EV Risk IndexBuyer's guide
The used-EV pre-purchase inspection checklist
Our risk ratings assess a model-year platform — chemistry, battery supplier, recall history, platform maturity. They do not assess the specific car in front of you. Owner-side factors routinely outweigh the platform score, so before buying any used EV, work through the checks below.
Why two identical EVs can be in very different condition
Two cars of the same model and year, at the same odometer reading, can differ by 20 points of effective battery health. The variables that matter most are all owner-side:
- Driving style. Hard acceleration, aggressive braking, and high-speed cornering accelerate wear on cells, suspension, tires, and brakes.
- Charging habits. Routine DC fast-charging to 100% on NMC or NCA chemistry materially accelerates degradation. An LFP variant charged daily to 100% is fine; an NCA Long Range variant charged that way is not.
- Climate exposure. Garaged vehicles last dramatically longer than those parked outdoors in extreme heat or cold. Coastal salt and heavily salted winter roads accelerate undercarriage corrosion.
- Scheduled maintenance. Manufacturers publish inspection requirements — typically every 12–24 months — that are conditions of full warranty coverage. Skipping them can void otherwise-valid claims.
The inspection checklist
Before buying any used EV — especially one in the Moderate, High, or Critical risk bands — commission a pre-purchase inspection from a qualified EV technician. Not a general mechanic, not the dealer selling the car. At minimum, it should cover:
- Battery state-of-health scan. Every major EV platform exposes capacity data via OBD2 or manufacturer tools. A three-year-old car should retain 90%+ of original capacity; a five-year-old, 85%+. Substantially worse points to platform issues or abuse.
- Tire condition and wear pattern. Uneven wear signals alignment problems or aggressive cornering; mismatched brands or sizes signal corner-cutting. Tread and rotation history are among the most reliable proxies for overall owner care.
- Service-record review. Ask for the complete history — dealer-stamped maintenance, software updates, warranty claims. Gaps matter. Frequent owner or address changes are worth investigating.
- Visual inspection for abuse. Undercarriage damage, curb-struck wheels, undocumented modifications, and undisclosed collision repair.
- Recall completion verification. Run the specific VIN through the regulator databases. Every applicable campaign should show “remedy completed.” Outstanding campaigns can transfer to you as the new registered owner — get them closed before taking possession.
Manufacturer maintenance requirements and your warranty
EV manufacturers typically require specific inspections at defined intervals — often every 12 or 24 months — as a condition of full warranty coverage: brake-fluid changes, cabin-filter replacement, coolant-system checks, tire rotations, and software updates. Owners who neglect these can have claims denied even for unrelated issues. A vehicle with a complete documented inspection history is measurably more valuable, and lower risk, than an otherwise identical car without records. Verify the history yourself with the manufacturer's dealer network rather than relying on the seller.
How to use our rating
A high failure index means the category of vehicle — this model, year, and platform — carries elevated risk relative to alternatives. It does not mean any specific car will fail, and a low score does not guarantee a specific car is sound: a neglected low-risk vehicle can easily be worse than a well-maintained high-risk one. The rating is a starting point for due diligence, not a substitute for it. See our six-factor methodology for how scores are calculated, or browse all rated vehicles.