Check-engine and warning lights
Share which light appeared, when it started, and whether the vehicle is driving differently.
Warning lights & drivability
Diagnostics before parts are guessed at.
Check-engine lights, no-starts, charging problems, electrical concerns, misfires, and drivability issues need testing before repair decisions are made.
No-start and charging concerns
Battery, starter, alternator, wiring, and other faults can create similar symptoms.
Drivability symptoms
Loss of power, rough running, stalling, hesitation, or unusual fuel use can guide the diagnostic process.
A real diagnostic example
2022 Ram 1500 power-loss concern.
The truck arrived with an existing propane conversion and a reported loss of power. Wrenches identified a misfire and replaced the affected ignition components.
Hard-to-pin-down issue?