Monitoring

Your Model X Air Suspension Leaks by Design — Here's What Healthy Looks Like

The most expensive lesson in my ownership-cost writeup was a single line: $5,612 for both front air struts. Both were leaking. And the part that stuck with me wasn’t the number — it was the timeline. By the time a corner visibly sagged in the driveway, the springs had been losing pressure for weeks. The failure was slow, invisible, and completely knowable in advance. I just wasn’t watching.

So after that bill I did the obvious engineer thing: I started logging the suspension pressure off the CAN bus. The first thing I learned surprised me — a healthy air spring leaks all day, every day. Detecting “a leak” is trivial and useless; the whole car is leaking right now. The real problem is telling a normal leak from a failing one.

Why a Good Tesla Monitor Should Almost Never Alert You

Here is the uncomfortable truth about any health monitor: it is only worth the one alert you actually believe.

The first time your car monitor cries wolf, you forgive it. The second time, you start to doubt it. By the third, you’ve muted the notifications — and now the expensive failure it was built to catch sails through to a dead car in a parking garage. A monitor you’ve learned to ignore isn’t a safety feature. It’s a widget.

One Frame Out of 789,272: The Isolation Alarm We Didn't Send

Here’s a number that should have set off every alarm I built.

On June 29, my 2017 Model X’s battery management system reported its high-voltage isolation resistance at 50 kΩ — one tenth of the floor most monitoring treats as the healthy minimum. That’s the kind of reading that, taken at face value, says the insulation between 400 volts and the metal body you touch is failing. On a lot of monitoring setups, that’s a 2 a.m. push notification and a drive to the service center.

I'm opening up my Tesla health monitoring garage

This is a launch post. If you’ve followed the Tesla Longevity Lab channel or seen me reply to threads on Tesla Motors Club and Reddit, you know what I’ve been working on. Today I’m taking the wraps off.

Today, two things go live:

1. t800.io — the website for T800, a long-term health monitoring system for Tesla Model S/X.
2. t800.io/garage — a public daily health report for my own 2017 Model X 100D, updated every morning. Real CAN telemetry, not a mockup.

That’s the launch. Below is the why.