What still works tells you where to look: a tap that works while walk-up entry fails, a car that unlocks but will not start, a key that only works on the console pad, or a shared key that never activates. The causes Kia, Genesis, Google, Apple, Samsung, BMW, Ford and Tesla document, and the comparisons to make before deleting the key.
NFC at 13.56 MHz over a few centimetres, Bluetooth LE across 2.402 to 2.480 GHz, UWB on channels centred near 6.49 and 7.99 GHz with centimetre ranging: the published figures behind phone keys, which iPhones and Android phones support passive entry, and the fallbacks for a phone that is off.
Published EV charging numbers in one place: DOE charging levels (1.9 kW Level 1, 2.9 to 19.2 kW Level 2, up to 500 kW DC), the NEVI 150 kW and 250 to 920 V minimums, CCS, NACS, CHAdeMO and GB/T coupler ratings, and onboard-charger, pack-voltage and 10 to 80% figures from Hyundai, Kia, Porsche, Nissan and Lucid.
Ford shows Pre-Collision Assist Not Available in two forms: with Sensor Blocked, the manual says clean the camera and radar area and wait several minutes; without it, Ford bulletins tie the fault to an image processing module in low-power mode after remote start, module software, or a loose camera cable. A 2026 recall covers module resets on four Lincoln and Ford SUVs.
Subaru shows EyeSight Disabled with a white temporary-stop indicator that clears itself, and EyeSight Off Check Manual with a yellow warning indicator that means a stored fault. The manual, five Subaru bulletins and two recalls separate glass, temperature, camera software, low voltage and the brake-pedal switch.
Honda ties the Collision Mitigation Braking System Problem message to at least four stored codes: U0401-92 fixed by engine software, P2583-76 radar aiming, C0041-14 brake switch, and temporary sensor shutoffs. Which one you have decides the fix.
