Check Engine Light Diagnosis
The dedicated page for check-engine-light-specific OBD-II codes.
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ASE-Certified Technicians
Every Warning Light Covered
Mobile Auto Diagnostics in Sparks, NV
ABS, airbag, TPMS, transmission, emissions, any warning light beyond the check engine light gets a full-system scan with manufacturer-level equipment, so we find the actual cause instead of guessing.
Only the check engine light on? See our dedicated page →
Written Warranty
On any repairs performed
Manufacturer-Level Scan Tools
Every control module, not just the engine
Modern vehicles have a dozen or more separate computer modules (engine, transmission, ABS, airbag/SRS, TPMS, body control, and more) each capable of triggering its own dashboard warning light. Auto diagnostics means connecting to every one of those modules, not just the engine, to find out what's actually happening across your vehicle's electronics.
Quick AnswerAuto diagnostics is a full-system scan covering every warning light on your dashboard besides the check engine light: ABS, airbag, TPMS, transmission, and emissions systems included. It's the right service when more than one light is on, or when the light you're seeing isn't the check engine light.
- Covers ABS, airbag/SRS, TPMS, transmission, and emissions modules
- Especially useful when multiple lights are on at once
- Uses the same manufacturer-level tools as a dealership
- Only the check engine light on? See our dedicated diagnosis page instead
What's Included
Systems We Scan
A full diagnostic scan checks every module your vehicle's computer network makes available, including:
- ABS and anti-lock brake system modules
- Airbag / SRS restraint system
- Tire pressure monitoring system (TPMS)
- Transmission control module
- Emissions system components
- General body/electrical control modules
Signs You Need This
When to Book a Full Diagnostic Scan
- More than one dashboard warning light is on
- The ABS, airbag, or TPMS light is on
- The transmission is shifting oddly alongside a warning light
- You're not sure which dashboard light you're looking at
- A pre-purchase inspection calls for a full electronic health check
Telling Them Apart
Auto Diagnostics vs. Check Engine Light Diagnosis
These are two different services for two different situations. If the only light on your dashboard is the check engine light, our dedicated check engine light diagnosis page covers that specific OBD-II code reading in more depth.
Auto diagnostics, this page, is the broader service: used when the ABS, airbag, TPMS, or transmission light is on, when multiple lights are on at once, or as part of a full electronic health check on a used vehicle.
How It Works
Our Diagnostic Process
The same thorough process across every system we check.
1
Full-System Scan
We connect a manufacturer-level scan tool and read every available control module, not just the engine.
2
Isolate the Cause
We test the specific components each code points to, especially when multiple lights share a root cause.
3
Review Your Options
You get a written estimate before any parts are ordered or work begins.
4
Repair & Verify
We complete the repair and confirm every light stays off after a road test.
Transparent Pricing
What a Full Diagnostic Scan Typically Costs
The scan itself is a fixed, predictable cost, what you pay beyond that depends entirely on what it finds.
A full-system diagnostic scan runs $99–$149, applied toward the repair if you move forward. Multiple systems flagged at once doesn't necessarily mean multiple separate repairs. We'll always confirm the actual cause and give you a written estimate before starting any work.
Frequently Asked Questions
Auto Diagnostics Questions, Answered
A full-system diagnostic scan runs $99–$149, applied toward the repair if you move forward. The final repair cost depends entirely on what the scan finds.
Check engine light diagnosis focuses specifically on that one light and its OBD-II engine codes. Auto diagnostics covers every other warning light on the dashboard (ABS, airbag, TPMS, transmission, and emissions systems) and is the right service when more than the check engine light is involved.
Multiple lights firing together often point to a shared root cause, like a failing sensor feeding several systems or a battery/charging issue affecting the whole electrical system, rather than several unrelated problems. A full scan across every module helps us find the actual common cause instead of chasing each light separately.
An ABS light usually means your regular brakes still work but the anti-lock system may not engage in an emergency stop, worth getting checked soon. An airbag/SRS light means the restraint system may not deploy correctly in a crash, which is a safety-relevant issue we recommend addressing promptly.
Yes. We use manufacturer-level scan tools capable of reading every control module on your vehicle, the same class of equipment used at dealerships, across domestic, Japanese, Korean, and European brands.
A full-system scan typically takes 30–60 minutes. Confirming the exact cause of a specific warning light can take longer depending on how many systems are involved.
Also Worth Knowing About
Related Services
Once we know the cause, one of these teams often picks up the repair.
Electrical Repair
Wiring and electrical faults not tied to a specific control module light.
Learn more
Transmission Repair
When the transmission control module code points to internal wear.
Learn more
Emergency Auto Repair
Multiple lights on and worried about driving? Same-day priority service.
Learn moreAuto diagnostics is part of our complete auto repair services. If it's only the check engine light, see our dedicated check engine light diagnosis page instead.
Where We Work
Auto Diagnostics Near You
Based in Sparks, with easy reach across the greater Reno-Sparks area.
Not Sure What's Wrong?
Book a full diagnostic scan online in under a minute, or call now and talk to a real technician, not a call center.
Our Promise
Every Diagnosis Is Backed by Our Written Warranty
We stand behind the diagnosis and the repair. Warranty terms are printed on every invoice, so you know exactly what's covered.
- ASE-certified technicians on every job
- Written parts-and-labor warranty
Get In Touch
Contact Auto Repair Sparks
Service Area
Based in Sparks, NV - mobile service across Sparks & Reno
Phone
Business Hours
| Monday | 7:30 AM – 6:00 PM |
| Tuesday | 7:30 AM – 6:00 PM |
| Wednesday | 7:30 AM – 6:00 PM |
| Thursday | 7:30 AM – 6:00 PM |
| Friday | 7:30 AM – 6:00 PM |
| Saturday | 8:00 AM – 4:00 PM |
| Sunday | Closed · Mobile service - we come to you |
Auto Repair Sparks
Mobile service across Sparks, Reno & the Truckee Meadows