Manifold: Car Diagnostics

Manifold turns your OBD2 adapter into a diagnostic tool that explains itself.

Plug in a Bluetooth ELM327 adapter, scan your vehicle, and get the trouble codes — then get an actual explanation of what they mean for your car, what's likely causing them, what it should cost to fix, and whether it's safe to keep driving.

WHAT IT DOES

Read and clear trouble codes. Stored and pending codes, check-engine-light status, and freeze-frame data from any OBD2-compliant vehicle (1996 and newer in the US).

Live gauges. Watch coolant temp, RPM, load, fuel trim, and more while the engine runs.

Plain-English diagnosis. Codes come back as "P0301" — Manifold tells you what that means for your specific year, make, and model, ranks the likely causes, estimates parts and labor cost, and rates the job's difficulty for a DIYer.

Straight answers on severity. Every diagnosis says whether you're safe to drive, should get it looked at soon, or should stop driving now.

Ask a mechanic. A chat that knows your vehicle and your codes. Attach a photo of the part you're looking at and ask what it is.

Garage and maintenance log. Track multiple vehicles, record service history, and set mileage reminders for the next oil change or belt.

BRING YOUR OWN API KEY

The AI features run on Google's Gemini API using a free key you create yourself, so there's no subscription and no middleman. Manifold shows you how to get one in about two minutes. Scanning, code lookup, gauges, garage, and maintenance tracking all work without a key at all.

NO SUBSCRIPTIONS

Four AI diagnoses and ten chat messages are free. One purchase unlocks unlimited use, forever. No ads, no recurring charges, no account to create.

WHAT YOU NEED

An OBD2 Bluetooth adapter (ELM327-compatible) and a vehicle from 1996 or later.

Manifold is a diagnostic aid, not a replacement for a professional inspection. On anything involving brakes, steering, fuel leaks, or overheating, get eyes on it.