🔧 Wrench Buddy

A code is a circuit, not a part. — Mike Cole

1️⃣ Customer complaint

What's wrong? (plain English, customer's words)

Common ones: uses oil sluggish uphill rough idle + CEL trans slipping poor MPG bearing noise overheating AC not cold parasitic drain vibration at speed brake pulse pulls left/right clicking on turns ABS light

2️⃣ Code lookup

Try: P0755, P0130, P0301, P0440, U0100

🧠 Why this matters (Mike's teaching, baked in)

From the 29-minute call: "The code just tells me the CIRCUIT. AutoZone hands them an O2 sensor based on the code, customer installs it, didn't fix it, because that wasn't the problem. They just diagnosed the CIRCUIT."

Every code in this library is structured Mike's way:

Circuit — what the code actually points at (not "the sensor is bad")
Every possible failure point — sensor, wire, ground, connector, PCM driver, TSB
How to probe — what voltage, resistance, scope pattern proves which one
Common fix — the answer that usually works on this make/model
Notes — TSBs, gotchas, Mike's lifetime-DB observations

🚧 Next round (not built tonight)

Voice IN (tech speaks the complaint instead of typing) — Web Speech API recognition, works in Chrome
Schematic viewer (top 200 codes get simplified SVG with circuit highlighted)
Mitchell ProDemand API pull for everything else
Cross-reference to lifetime customer DB ("we saw this VIN with the same symptom in 2024")
The Spider-Pin / Relay-Pin hardware integration when prototype ships