How to Read and Clear Car Trouble Codes

To read a trouble code you just need an OBD2 adapter and an app. Here are the typical steps:

Step by step

• Plug the OBD2 adapter into the car's port (ignition on).
• Open AutoMulti; the adapter is found automatically and connects.
• Read the trouble codes; each shows a plain-language explanation.
• Review the suggested checklist.

Is clearing codes safe?

Clearing a code doesn't fix the problem — it only resets the stored record and the light. If a real fault remains, the code returns. Before clearing, understand the cause and fix it if possible. Emissions 'readiness' monitors reset after clearing and take time to re-run; worth knowing before an inspection.

When should you clear?

If you've done the repair, or it was temporary (e.g. you tightened a loose fuel cap), you can clear the code and watch whether the light returns. If it comes back, the problem persists.

AutoMulti reads codes, explains them in plain language and helps you clear them when appropriate. Curious about a specific code? Check our trouble code dictionary.