Check engine light on?
Check engine light diagnostics in Corona, CA
That little amber light raises big questions. We find out why it's on: we scan, test, and confirm the cause, then show you what we found before you approve any repair.
Book online any time, day or night. Saturdays by appointment only.
- ASE-certified technicians
- CARFAX Car Care Service Center
- RepairPal
- ATI
- Book soon
- Come in right away
- Stop driving. Call us.
Steady: the vehicle stored a fault that should be diagnosed soon. If it drives normally, schedule testing rather than guessing at a part.
Book a diagnostic visit- Book soon
- Come in right away
- Stop driving. Call us.
Flashing: often an active misfire, which can overheat and damage the catalytic converter. Reduce speed, avoid hard acceleration, and call us. If the vehicle is running badly, stop when it's safe.
Call (951) 393-0278A code is a clue, not a diagnosis.
Scanning tells us where to look. Testing tells us why.
A diagnostic trouble code names a system or condition the vehicle's computer noticed. It doesn't prove which part failed. One code can have several causes, so replacing the part a scanner points to is a guess. We use the code to aim our testing, then confirm the cause before recommending a repair.
In California, a vehicle with the check engine light on won't pass a smog check, one more reason to find the real cause.
How we find the cause
Listen
Tell us what you noticed, when it happens, and what changed. We take the time to understand it.
Scan
We retrieve trouble codes and the data the vehicle recorded.
Analyze
We compare codes, symptoms, and data instead of treating a code as a parts list.
Test
Targeted checks on the system the evidence points to.
Verify
We confirm the cause before recommending a repair.
Explain
Your digital vehicle inspection includes photos and videos, so you can see what we see. We tell you what's urgent, what's recommended, and what can wait.
You decide
You approve all work before it begins. No high-pressure sales. You make the decisions for your vehicle.
Dashboard warning lights, and how urgent they are
Red means stop when it's safe. Amber means get it checked soon. Green and blue lights are usually just information. Tap a light for what it commonly means and what to do.
Check engine Book soon
What it commonly means
The engine computer stored a fault involving emissions, fuel, ignition, sensors, electrical systems, or engine performance.
What to do
Steady and driving normally: schedule diagnostic testing. Flashing, or running badly: treat it as urgent and call us.
Book onlineOil pressure Stop driving. Call us.
What it commonly means
The engine may not be holding safe oil pressure. Low pressure can damage internal engine parts quickly.
What to do
Pull over when it is safe and shut the engine off. Check the oil level only if it is safe to do so, then call us before driving on.
Call (951) 393-0278Engine temperature Stop driving. Call us.
What it commonly means
The engine is running too hot, or the cooling system isn't controlling temperature normally.
What to do
Pull over when it is safe and shut the engine off. Never open a hot radiator or coolant cap. Call us.
Call (951) 393-0278Battery / charging Come in right away
What it commonly means
The charging system may not be keeping the battery charged. The battery can run down and the engine may stall.
What to do
Turn off accessories you don't need and have the charging system tested right away, especially if lights dim or other warnings appear.
Call (951) 393-0278Brake Stop driving. Call us.
What it commonly means
A red brake light can mean the parking brake is on, the brake fluid is low, or there is a hydraulic brake problem.
What to do
Make sure the parking brake is fully released. If the red light stays on or the pedal feels wrong, stop driving and call us.
Call (951) 393-0278ABS Book soon
What it commonly means
The anti-lock braking system found a fault. Normal braking usually remains, but the anti-lock feature may not work.
What to do
Book testing soon. If the red brake light is on too, treat it as stop driving and call us.
Book onlineTire pressure (TPMS) Book soon
What it commonly means
One or more tires may be low, or the tire-pressure monitoring system needs attention.
What to do
Check pressures when the tires are cool. If a tire is visibly low or losing air, don't keep driving on it.
Book onlineAirbag (SRS) Come in right away
What it commonly means
The restraint system found a fault that can affect the airbags or seat-belt pretensioners.
What to do
Have it diagnosed promptly. Don't probe or repair airbag wiring yourself.
Call (951) 393-0278Traction / stability Book soon
What it commonly means
A brief flash usually means the system is working on a slippery surface. A light that stays on can mean it is switched off or has a fault.
What to do
If it stays on after restarting the vehicle, book testing soon.
Book onlineThis guide is for education and can't diagnose your vehicle. A technician confirms the cause.
For the car you drive and the vehicles your business runs on
Fleets are welcome: vehicles one ton and under get the same test-first diagnostics, maintenance, and repair.
- European vehicles
- Domestic vehicles
- Japanese, Asian, and other imports
- Hybrid and electric vehicles
- Diesel vehicles
- Fleet vehicles, one ton and under
The people behind the diagnosis
Super Service traces back to 1978, when Ralph "Buddy" Dubois opened Placentia Super Service. Andrew Bray and Bob Cornwall took the helm in 2016 and built it into four shops, including Super Service of Corona Hills. Along the way, Super Service was named National Multi-Shop of the Year by the nation's leading automotive training group.
Andrew is an ASE Master Technician with ASE World Class status who loves coaching young technicians, and Bob created the "Raving Fan Checklist" so guests leave glad they came. In Corona Hills, that shows up as ASE-certified technicians, straight answers, and no pressure.
A newly licensed teen or a retired driver should feel equally sure they'll be treated fairly.
Warranty
Ask about our 3-year, 36,000-mile nationwide parts and labor warranty on qualified repairs. We're happy to walk you through the details. We make it easy to do business with us.
Warranty detailsCheck engine light questions
Why is my check engine light on?
It can come on for many reasons, from a loose gas cap or a failing sensor to an ignition, fuel, electrical, or engine-performance problem. The light tells you the vehicle detected a fault. Testing is what identifies the cause.
What does a steady check engine light mean?
A steady light usually means the vehicle has stored a fault that should be checked soon. If the vehicle otherwise drives normally, schedule diagnostic testing rather than ignoring the light or replacing a part based only on a code.
What does a flashing check engine light mean?
A flashing light often signals an active misfire, which can overheat and damage the catalytic converter. Reduce speed, avoid hard acceleration, and call us. If the vehicle is running badly, stop when it is safe to do so.
Can I keep driving with the check engine light on?
It depends on whether the light is steady or flashing and how the vehicle is behaving. A steady light with normal driving usually leaves time to schedule a visit. A flashing light, a major loss of power, overheating, a strong fuel smell, or severe shaking needs attention right away.
Does a trouble code tell you which part to replace?
No. A diagnostic trouble code names a system or condition the vehicle's computer noticed. It is a clue that guides testing, and the same code can have more than one cause. That is why we test before recommending a repair.
How do you diagnose a check engine light?
We listen to what you noticed, scan for codes and data, analyze them, run targeted tests, and confirm the cause. Then we explain what we found, with photos and videos from your digital inspection, before you approve any repair.
Will a check engine light affect a California smog check?
Yes. In California, a vehicle with the check engine light on will not pass a smog check. Finding and fixing the cause comes first.
What vehicles do you work on?
Most makes and models: European, domestic, Japanese, Asian, and other imports, including hybrid, electric, and diesel vehicles. Call if you want to confirm a specific vehicle.
Do you diagnose fleet vehicles?
Yes. Fleet vehicles one ton and under are welcome for diagnostics, maintenance, and repair.
When can I bring my vehicle in?
Monday through Friday, 7:30 AM to 5:30 PM. Saturdays are available by appointment only, and we are closed Sundays. You can request an appointment online any time, day or night.
Is this the shop that used to be Car Clinic?
Yes. The Car Clinic location on Sampson Avenue is now Super Service of Corona Hills.
More from Super Service of Corona Hills
Diagnostic and engine services
Before you visit
Nearby areas we serve
We make it easy to do business with us.
Tell us what the light is doing and how the vehicle feels. We'll help you figure out the right next step.
2189 Sampson Avenue #101a
Corona, CA 92879
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