Sometimes you’re free to’t avoid a trip to your mechanic.

Thanks to a handy little gadget called an ODB-II reader, you might.

Thankfully, I didn’t have to.

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In my case, the most probable source was either:

You read that last entry correctly.

is in the ODB log.

Which is exactly why we think everybody should own an ODB-II reader.

An ODB diagnostic port, visible under the front console of a vehicle.

Gargantiopa/Shutterstock.com

Historically they were quite expensive, and it was impractical to own one for home use.

And if you use your phone as the interface, you could save even more.

Reliabledongle-only ODB-II readersare under $20.

A screenshot of the an iPhone app displaying ODB supplied diagnostic codes.

you’re free to diagnose your car right at home for the cost of a fast food lunch.

If you opt for the dongle option, we strongly recommend you only buy Bluetooth versions.

Better to get a Bluetooth model and retain the ability to use your phone normally.

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This all in one unit is perfect if you don’t want to use your phone with your ODB scanner or want to give one as a gift to somebody who prefers traditional tools.

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Pop it on your ODB port, pair it with your phone, and your phone instantly becomes an ODB scanner.