A check engine light diagnostic isn't a flat fee — it depends on the vehicle and how many systems the code touches. San Francisco Auto Repair diagnoses the code first and quotes the repair after, so you know the number before anything else happens. The shop is open 9 AM–6 PM Monday through Saturday; most scans happen the same visit.
What changes the price of a diagnostic?
A single, well-known code — a loose gas cap, a failing oxygen sensor — is usually quick to confirm and cheap to check. An intermittent fault that only shows up under specific conditions takes longer, because a technician may need to road test the car or clear the code and wait for it to return before pinpointing the cause.
Newer vehicles with more onboard modules can also take longer to scan than an older car with a simpler engine computer, since there's more to rule out before landing on the actual cause.
Steady light or flashing light — does it matter?
A steady check engine light usually isn't urgent enough to strand you today, though it should still get looked at soon. A flashing light is different — it typically points to an active engine misfire, and continuing to drive on it can send unburned fuel into the catalytic converter and damage it.
If the light is flashing, or it comes with a burning smell, a loss of power, or a climbing temperature gauge, that's worth a call before you keep driving rather than waiting for a routine appointment.
How do I get an exact number before work starts?
Call ahead with the year, make, model, and what the car is doing — a rough sense of the symptom helps the shop budget the right amount of time for the scan. San Francisco Auto Repair is at 7355 Geary Blvd and open 9 AM–6 PM Monday through Saturday, closed Sunday, so same-day drop-off is usually possible on any day it's open.
Can I drive with the check engine light on?
If the light is steady, it's usually safe to drive for a short while, but don't put off getting it scanned. If it's flashing, stop driving as soon as it's safe and have it looked at — that pattern points to an active misfire that can damage the catalytic converter the longer you keep driving.
Will the diagnostic fee be applied toward the repair cost?
That varies shop to shop, so ask when you book. San Francisco Auto Repair will lay out the full cost before any repair work starts, so it's never a surprise on the invoice.
What if the code doesn't point to one clear cause?
Some faults are intermittent and don't show up the moment the car is scanned. In that case, expect a road test or a follow-up visit rather than an instant answer — it takes a little longer, but it avoids replacing parts that weren't actually the problem.
Can I get a diagnostic done the same day I call?
Often, yes. The shop is open 9 AM–6 PM Monday through Saturday, and calling ahead with your symptom lets them fit the scan into that day's schedule.