Symptoms, specs, maintenance, safety guides and calculators. Everything you need to understand and care for your car.
Every guide on this site falls into one of four structured categories. Pick one.
Noises, lights, vibrations and leaks decoded in plain English.
Browse symptoms →
Oil, brakes, batteries. Clean, practical guides.
Browse maintenance →
Pressure, capacity, torque. By make and model.
Browse specs →
Hot-weather and winter checklists, go/no-go conditions, and driving preparedness.
Browse safety →
Annual cost, road trip risk, and more interactive tools.
Open calculators →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.
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.
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.
The outside temperature on the dash is the ambient air temperature sensor talking. Read the number it shows, rule out the display delay carmakers build in, then measure the circuit at the cluster before the sensor. Tesla, BMW, GM and Audi service documents as the examples.
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.
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.
Published V2X figures with their sources: the 5.9 GHz band plan the FCC finalised in 2024, the 10 Hz, 300 m basic safety message, 3GPP latency targets for C-V2X, ETSI ITS-G5 channels and CAM rates, and what production cars in Europe and the US actually carry.
A road-trip checklist for parking safely at hotels and motels overnight: where to park, how to make the car a poor target for theft, and what to check before you drive off.
A safety checklist for installing a dash cam yourself: legal windshield placement, cable routing clear of airbags, power options, and testing before you drive.
What a car safety inspection and emissions test actually check, what commonly fails, and how to get your car ready before a registration renewal.
