What your check engine light is telling you, from steady to flashing, what to check right away, when to pull over, and how to read the code behind it.

Four quick questions to narrow down the right OBD2 scanner for you, with budget tiers, a decision table and our picks for each type of driver.

Step-by-step setup for a Bluetooth OBD2 scanner on iPhone and Android, how to read codes and live data in the app, and fixes for the most common connection problems.

Car scanner can mean anything from a $20 code reader to a dealer-level scan tool. Here is how each type works, what it can access, and which one fits you.

A clear explanation of what an OBD2 scanner is, what it reads from your car, the main types, and what it can and can not tell you about a check engine light.

Stacking a magnetic power bank between your iPhone and a MagSafe car mount usually weakens the hold and blocks charging. Here is why, and the setups that work better.

An iPhone-specific look at magnets: why MagSafe iPhones are built for them, what Apple warns about, and how magnets can affect the compass, cards and medical devices.

Do magnets damage phones? A clear look at what everyday magnets can and can not do to a smartphone, from storage and screens to compasses, cards and wireless charging.

Your phone sticks to magnets because it contains several of its own: a MagSafe ring on most iPhones, plus speakers, vibration motors and sensors. Here is what each does.