iOS OBD2 Scanner & ELM327 App

OBD2 diagnostics for iPhone: read fault codes and live data with a compatible adapter. Check connection requirements and explore AIscanAuto repair guidance.

Turn your iPhone into a powerful OBD2 scanner. Connect an ELM327 Bluetooth adapter, read check engine codes, monitor live data PIDs, and get AI-powered repair guidance — all from your pocket.

iPhone adapter compatibility

Choose an adapter explicitly supported by the iOS app. An ELM327 label or a Bluetooth version alone does not guarantee compatibility. Check the connection type and current app requirements before buying an adapter.

Read & clear DTC codes on the go

Scan stored and pending fault codes instantly. View severity levels, detailed descriptions, and AI-generated repair recommendations for thousands of OBD-II codes including P0420, P0171, P0300, and more.

AI mechanic in your pocket

Ask the AI assistant anything about your vehicle. Get plain-language explanations of fault codes, step-by-step troubleshooting guidance, and repair cost estimates. The AI understands context from your scan data and gives personalized advice.

Local and online features

Feature availability depends on the app version and selected AI mode. Check the current app documentation for internet requirements and review the privacy policy before sending diagnostic data to an online service.

P0420 catalyst efficiency — repair cost context

If you are researching P0420 (catalyst system efficiency below threshold) , note that catalyst fix cost varies widely by vehicle, part quality, and labor. Read the code page for symptoms and tests before you budget parts.

Live data PIDs on iPhone

Monitor real-time engine parameters: OBD2 live data & PIDs explained — useful when you watch fuel trim, RPM, coolant temp, and O2 sensors on your iPhone.

Before your first scan

Check that your adapter supports your device and the vehicle systems you need. Connect it with the vehicle parked, select the connection in the app, and save the codes and freeze-frame data before clearing anything. A fault code identifies a condition to investigate; it does not by itself prove which part needs replacing.