'Facebook Groups Aren’t It:' Mechanic Can’t Figure Out What’s Wrong with a Car. Then He Checks This Old School Online Resource

Picture this: You’re scrolling through an old car forum at 2 a.m., chasing a fix for a parasitic battery drain on a car you don’t even own anymore. Suddenly, there it is, the answer. A $12 relay. A ground wire. A one-click software reset. And now you’re just… staring, and feeling stunned.

That needle-in-a-haystack vibe is what auto enthusiast creator Giovanni Greenidge (@jdmretrogio) was looking to evoke with his viral Facebook reel.

In the post, Greenidge uses a clip of Hank from Breaking Bad having a lightbulb moment while reading on the toilet. In a text overlay, he writes, “POV: sitting on a toilet reading a 10 year old post in a forum and finally figuring out what’s wrong with your old car.” He captions it, “That AH HA moment!”

The reel received hundreds of comments from other mechanically minded viewers.

“Happened with my old Skoda, had it 18 months and got an error light on the dash that I couldn’t get rid of, bought my new car and started a car coding business, turns out it was 1 press of a button in the coding app that turned the error light on and off,” one shared.

The Fixes that Got Away

The comment section on Greenidge’s video reads like a therapy group for frustrated car owners and former project car dreamers. One user wrote, “Sold my truck in January, yep just found out the one thing I didn’t touch was the issue.” Another described finally solving a mysterious no-start problem immediately after handing over the keys to a buyer.

Whether it’s Honda-Tech, NASIOC, VWVortex, or brand-specific Facebook groups, the deeper corners of internet car culture have long served as accidental time capsules. Often the most helpful solution doesn’t come in the form of a polished YouTube tutorial or a Reddit upvote. It’s buried in a post from 2008 with poor grammar, a dead Photobucket image link, and three conflicting answers, only one of which turns out to be gold.

For many mechanics and DIYers, that long-buried answer tends to show up after the car is gone. That’s the sting so many commenters shared in Greenidge’s thread. One viewer confessed they scrapped a car after trying everything to diagnose a weird stalling issue—only to later learn that a seized drum brake was holding the car back like an invisible anchor.

In nearly every story, the reveal hits just a beat too late.

Mechanics’ Many Methods

Greenidge’s clip also raises a larger question: how do mechanics actually diagnose a car problem—especially when the issue doesn’t show up on a scan tool or dashboard warning light?

It starts with symptoms, not just codes. Mechanics begin by listening to the driver’s description, then attempt to replicate the problem during a test drive or inspection. From there, they isolate systems—fuel, ignition, electrical, transmission—and use a combination of tools like OBD-II scanners, pressure gauges, and multimeters to rule out common failure points. ASE-certified technicians are trained to follow a methodical, often hierarchical process: start simple, then escalate. That might mean checking for blown fuses before testing a wiring harness.

For more obscure issues like intermittent stalling, battery drain, or odd electrical behavior, the process becomes part science, part sleuthing. Forums and technical bulletins are common reference points, especially for vehicles with known “gremlins.” Some techs use Mitchell 1 or ALLDATA for OEM service data. Others dive deep into online communities, hunting for posts that match the symptoms exactly.

While today’s car owners are quick to search YouTube, Reddit, or ask ChatGPT, the real answers often live in neglected corners of the internet. Many of the most informative car forums are poorly indexed by modern search engines or difficult to navigate due to outdated interfaces and broken links. And Facebook groups, despite their popularity, are notoriously unreliable for diagnostics.

It’s not that better platforms don’t exist. It’s that the right answer is often old, obscure, and specific to a particular year-model-build combo that only a handful of people ever documented. YouTube excels at walkthroughs for general repairs or popular vehicles, but for deeper electrical bugs, TSBs, or rare drivetrain issues, text-based forums still reign. It’s not unusual for even seasoned mechanics to rely on these resources in tandem with professional diagnostics.

Generative AI is also making inroads in the garage. A growing number of mechanics in a Reddit survey said they had used AI tools to help diagnose a repair, though most still cross-reference that advice against old-school forums and verified manuals.

When Greenidge dropped a Hank Schrader meme to illustrate that moment of painful clarity that hits out of nowhere, he tapped into a feeling every gearhead knows too well. The comedy of the clip may be in its delivery, but the real punchline lives in the comments: the half-dozen times we’ve all walked away from a problem… only to realize the fix was already written down. Somewhere. By someone. Maybe even by you.

Motor1 reached out to Greenidge via Facebook direct message. We'll update this if he responds.