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Check that you typed it exactly as printed. The code is not case-sensitive, but a mistaken 0 for O will fail. Each code covers two devices; if you have already activated two, free one up under Settings on a device you no longer use. If it still will not take, email us the code and we will look it up.

Turn the ignition to on before scanning. The OBD-II port has no power in some vehicles until it is, and the adapter's light should come on. Then check that the adapter is not paired in your phone's own Bluetooth settings: DriveDecode connects to it directly, and a system pairing can hold the link open so the app cannot claim it. If it is listed there, choose forget this device and scan again from inside the app.

That means the adapter is awake and the car is not answering. Almost always the ignition is off or only in accessory, and accessory power wakes the adapter but not the engine computer. Turn the key to on, or press start without your foot on the brake. If the engine is running and it still fails, unplug the adapter and plug it back in, which forces a fresh protocol search.

Your car does not report that sensor. Every vehicle publishes a different subset of the standard readings, and the list a car advertises is often longer than what it actually answers. DriveDecode keeps asking anyway, at no cost to the rest of the screen, so the reading appears the moment your car starts answering, when a hybrid restarts its engine for example.

Generic OBD-II only guarantees access to engine and emissions systems. ABS, airbag, TPMS and transmission-specific codes live on manufacturer-specific channels that need make-specific decoding, and no generic adapter can read them. We would rather say so plainly than sell you something that disappoints.

Clearing codes also resets your readiness monitors, and a test station will fail a car whose monitors have not run. They reset themselves over a mix of driving, typically 50 to 100 miles including highway and stop-and-go. Check the readiness screen in the app before you drive to the station.

Run it again with the headlights and blower on. Many newer cars deliberately dial charging back to 12.6 to 13.2 volts under light load to save fuel, and that is normal. If the voltage climbs once the load is on, nothing is wrong. If it stays low, the alternator, its belt or a connection is worth having looked at. Note this is a voltage reading, not a load test. A battery can read a healthy 12.6 volts and still fail to start the car on a cold morning.

Yes. A scan or a readiness check exports as a PDF with your vehicle details, the codes and what they mean, or as a CSV if you would rather have it in a spreadsheet. Print it, share it, or look at it on screen first.

Yes. The first screen offers "Explore with sample data", which runs the whole app against a simulated vehicle, with no adapter, no activation code and no connection needed. Everything is marked as sample data, including exports.

No. The activation code in your adapter box covers the app on two devices. There is nothing recurring.