Spent twelve years keeping sixty-two delivery trucks operational for a logistics company outside Chicago. Fleet maintenance at that scale is its own discipline: you learn to read degradation curves, build service intervals around real-world failure data, and develop an instinct for what breaks first and why. A truck that doesn't move stops making money, and that pressure sharpens your diagnostic priorities fast. Left fleet operations in 2021, holding the NAFA Certified Automotive Fleet Manager (CAFM) designation. The focus here is on preventive maintenance — the unglamorous, high-value work that most drivers ignore until something fails completely.
Tesla runs three tire pressure systems: Continental radio-frequency sensors, Tesla Bluetooth Low Energy sensors and sensorless indirect monitoring on Standard trims. How to tell which one your car has from Service Mode, what a replacement involves (8 Nm, 11 mm socket, a clean seat) and why the relearn is a drive above 15 mph, from Tesla service manual pages.
An EV coolant temperature sensor is the same two-wire NTC as on an engine, with a high-voltage shutdown, a litres-scale drain and a software-assisted refill around it. Test the circuit first, then the part, with Mitsubishi and Tesla procedures as the examples.
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.
Where jack points sit and how they are marked, what federal rules require of the jack itself, how to confirm a lift before going underneath, and what to do when the sill has rusted through.
Why Bluetooth pairs perfectly while CarPlay never appears: how to tell a wireless Wi-Fi fault from a wired USB data fault, what to check first, and typical repair costs.
Distorted car speakers usually point to one of a few faults: amplifier clipping, a blown speaker, loose wiring, or a poor audio source. Learn to read the sound, run the swap test, and fix it without replacing good speakers.
A hardwired GPS tracker usually draws only a few milliamps in sleep mode, far too little to kill a healthy battery on its own. Here is how to test the draw and when the tracker is really to blame.
A hardwired dash cam can drain your 12V battery in parking mode. Set the low-voltage cutoff correctly and power the camera from the fuse box to keep recording without risking a no-start.
If your EV will not charge at home, use this checklist to separate outlet, breaker, GFCI, charger, schedule, 12V battery, and car-side faults.
