Sometimes temporary effects appear after washing, particularly brake noise or moisture around sensors, but a warning that stays on should not simply be blamed on the wash.
Wet brakes can sound different briefly
Water and light surface rust can produce noise until the brakes dry through normal use. Braking should still feel normal.
Sensors can be obscured
Parking sensors and cameras may react badly to water, dirt or residue. Cleaning the sensor area can help, but do not dismantle anything.
Persistent warnings need checking
If a light stays on, braking changes or the car behaves oddly, treat it as a real fault until shown otherwise.
A car wash causing a temporary warning is usually maintenance territory. Damage caused by the wash itself is a separate question and should be documented.
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