Guide

How to Check Your Tesla Battery Health in 2026

Your Tesla’s battery pack is the single most expensive component in the car — commonly $12,000–$22,000 to replace out of warranty. Yet the owner UI gives you almost no visibility into its long-term health.

This guide covers the four ways to actually check it, from free to fully automated — and, more usefully, what each metric reads on a real nine-year-old Model X we’ve tracked every day for 263 days, so you know what “healthy” is supposed to look like before you go hunting for problems.

Tesla OBD-II Port: What It Is, Where to Find It, and What You Can Do With It

Every Tesla has an OBD-II port. Most owners don’t know it exists, what it does, or why it matters. Here’s the complete guide.

What Is OBD-II?

OBD-II (On-Board Diagnostics, version 2) is a standardized diagnostic interface required on all vehicles sold in the US since 1996. It provides access to the vehicle’s electronic control systems for emissions testing, diagnostics, and real-time data monitoring.

On traditional gas cars, OBD-II is primarily used for emissions-related data. On Teslas — which have no emissions system — the port provides access to the CAN bus (Controller Area Network), the internal communication backbone that connects every electronic module in the car.