A check-engine light means the onboard computer logged a fault code, and the code alone doesn't say how serious it is — a loose gas cap and a failing catalytic converter can trigger the same light. San Francisco Auto Repair reads the code and diagnoses the actual cause at 7355 Geary Blvd, Monday through Saturday, 9 AM to 6 PM.
The light itself is just a signal that the computer stored a code — it doesn't say whether the problem is a loose gas cap or something in the emissions system that needs real diagnostic time. Reading the code is the easy part; matching it to what's actually happening in your specific engine is the part that takes a trained tech.
San Francisco Auto Repair does that work at 7355 Geary Blvd, six days a week, 9 AM to 6 PM, closed Sundays. The shop's 4.7-star rating across 77 Google reviews comes from customers who brought in exactly this kind of ambiguous problem and got a straight answer instead of a guess.
Is it safe to keep driving with the light on?
A steady light usually means you can drive to your appointment without much risk, but a flashing light is different — that's the computer telling you the engine is actively misfiring, and continuing to drive on it can damage the catalytic converter. The distinction between steady and flashing matters more than most drivers realize before they ask about it.
A code doesn't clear itself just because the light goes out on its own after a few drive cycles — the underlying issue is still there, and it's still stored, even if the dashboard looks normal again.
- Steady light: schedule a diagnostic when convenient
- Flashing light: stop driving and have it looked at as soon as the shop can take it, ideally same day within business hours (9 AM–6 PM, Monday–Saturday)
Will you tell me the code number, or just fix it?
Both — you'll be told the specific code and what it points to, not just handed a bill. Some codes map cleanly to one part; others narrow it down to a system and need a bit more testing to isolate, and that's explained before any repair starts rather than after.
That's part of why two cars with the same check-engine code can need two different repairs — the code names the system, not the specific failure inside it.
What does it mean if the check engine light comes on and off?
It usually means the fault is intermittent — something like a loose connector or a sensor that only misbehaves under certain conditions — and the code is still stored even after the light turns off. San Francisco Auto Repair can pull that stored code even if the light isn't on when you bring the car in.
Can you tell me what's wrong over the phone?
Not accurately — the code narrows down a system, but confirming the actual cause takes a look at the car. Call (628) 444-4559 to book a diagnostic appointment during shop hours, Monday through Saturday, 9 AM to 6 PM.
Do you fix the problem or just diagnose it?
Both — San Francisco Auto Repair diagnoses the code and then repairs what's causing it, rather than sending you elsewhere with a printout. That's handled at the 7355 Geary Blvd location.
How many check-engine codes are there?
Enough that guessing isn't useful — the value is in reading your car's specific code rather than assuming based on symptoms alone. That's why the diagnostic step comes before any repair estimate.