A dead outlet is most often a tripped GFCI upstream — the protecting outlet may be in another bathroom, the garage, or outside. Next suspect: a tripped breaker that doesn't look tripped. An outlet that works intermittently, feels warm, or shows scorch marks is a different story: stop using it until it's replaced.
Typical in San Diego, CA: GFCI or standard outlet replacement $150–$300 by an electrician; adding a new outlet where none exists $250–$500 depending on access.
Sparks, scorch marks, a warm outlet, or one that works 'when you wiggle the plug' — unplug everything from it and call. Those are arc-fault warnings.
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Data by Servik — verified local pros from official license records and public sources. Cost figures are typical ranges, not quotes; a pro's written estimate is the real number.