What’s Included in a Car Diagnostic Test?
A car diagnostic test scans your vehicle’s internal computer systems for trouble codes and performance issues. This includes the engine, transmission, brakes, emissions, battery health, and more.
At Dr. Jack’s Auto Repair, we also check fluid levels, tire pressure sensors, and brake pad life—offering free diagnostics upon request to help you stay ahead of costly repairs.
Don't let the lights on your dashboard leave you in the dark.
Modern cars are packed with computers that monitor everything from your engine’s performance to your tire pressure. When something’s off—even slightly—your car throws a code.
But what do all those warning lights actually mean?
At Dr. Jack’s Auto Repair in Merrick, NY, we believe car diagnostics shouldn’t be a mystery—or a money pit.
Let’s break down exactly what’s included in a car diagnostic test, what it tells you, and why it can save you a ton of stress (and cash).
What Systems Get Checked?
Whether your dashboard says “Service Engine Soon,” or you just feel something’s off, a full diagnostic test often includes:
Computerized Code Scan (OBD-II):
- Engine misfires
- Oxygen sensor failures
- Transmission issues
- EVAP/emissions faults
- Fuel system performance
Component Checks & Visual Inspections:
- Brake pad wear
- Fluid levels (oil, coolant, transmission, brake)
- Battery condition + charging system
- TPMS (Tire Pressure Monitoring System)
- Belt/hose condition
- Oil life and oil level monitoring
- Air filter health
What’s Included at Dr. Jack’s (That Dealers Might Charge For)
At Dr. Jack’s Auto Repair, we go a step further.
√ Free Diagnostics Upon Request
√ Brake Pad Life, Oil Life, TPMS & Fluid Checks Included
√ NYS-Registered Inspection Center
√ Straightforward results you’ll actually understand
√ No surprise upsells or repairs you don’t need
We believe everyone deserves honest, clear information about their car—before committing to repairs.
Why a Diagnostic Test Is So Important
If you’re delaying repairs or ignoring that light on your dash, here’s what a diagnostic test can prevent:
| Symptom | What It Could Mean | Risk If Ignored |
|---|---|---|
| Check Engine Light | Misfire, O2 Sensor, Catalytic Converter | Poor MPG, failed emissions, engine wear |
| Vibration at Idle | Bad mounts, fuel issue, vacuum leak | Engine damage, rough ride |
| TPMS Warning Light | Tire pressure imbalance | Unsafe handling, tire blowouts |
| Sudden Power Loss | Throttle issue, bad sensor | Dangerous stalls or limp mode |
Serving Merrick and All of Nassau County
Since 1976, Dr. Jack’s Auto Repair has helped Long Island drivers stay safe, avoid overpaying, and understand what their cars actually need.
We’re not here to sell you parts. We’re here to keep your vehicle—and your wallet—in good shape.
Call Today for a Free Diagnostic Test
Don’t wait for a dashboard light to turn into a $1,500 problem.
📍
57 Brooklyn Ave, Merrick, NY
📞
(516) 785-1444 - Call or Text for an appointment
🛠 Family-Owned | Honest Service | Certified NYS Inspection Center
Frequently Asked Questions
What is a car diagnostic test?
A diagnostic test uses a computer to scan your vehicle for internal trouble codes related to the engine, transmission, emissions, and more.
How long does a diagnostic test take?
Most tests take 30–60 minutes, depending on your car and symptoms.
Is a diagnostic test always accurate?
It’s extremely helpful—but not always 100% conclusive on its own. That’s why we combine computer scans with visual inspections and road tests when needed.
How much does a diagnostic cost at Dr. Jack’s?
We offer FREE diagnostics upon request, including brake pad life, oil life, and TPMS checks.
Can I drive my car with a warning light on?
Some lights (like low tire pressure) aren’t urgent, but should be addressed promptly. Others—like the check engine light—can lead to serious damage if ignored. Always get it checked to be safe.
Over 40 Years of Automotive Excellence
For the over 40 years we’ve been in business, we have been striving to provide our clients the best quality service possible to gain their full satisfaction. And they’ve shown their appreciation by coming back to us repeatedly.
We want to be the auto maintenance and repair facility for all your automotive needs.
