Check Engine Light & Computer Diagnostics in Port Jefferson Station, NY

Is your check engine light on? Don’t ignore it, and don’t let just any shop guess at it. At Family Automotive Center in Port Jefferson, we run full computer diagnostics with dealer-level scan tools that read every system on your vehicle — engine, transmission, ABS, airbags, emissions, body control, and more. We don’t just clear the code. We find the root cause and fix it.

A check engine light has more than a hundred possible triggers, from a loose gas cap to a failing catalytic converter. Generic auto-parts-store scanners only read the most basic codes — and even those, they often misinterpret. Our diagnostic process pulls live data, freeze-frame snapshots, and manufacturer-specific codes most shops can’t even see.

What our diagnostic service covers

• Check engine light (CEL / MIL) — solid or flashing, we find it.
• ABS / traction control / stability light — wheel speed sensors, ABS module, brake pressure issues.
• Airbag / SRS light — seat belt sensors, clock springs, impact sensors, module faults.
• Transmission warning lights — shift solenoids, speed sensors, fluid temperature, internal faults.
• Drivability complaints — rough idle, hesitation, stalling, hard starting, surging, misfires.
• Performance loss — power loss, poor fuel economy, limp mode, “reduced engine power” message.
• Emissions / smog test failures — including readiness monitors that won’t set.
• Battery drain & electrical gremlins — parasitic draws, intermittent faults, communication errors.
• Pre-purchase inspections — buying a used car? We’ll scan every module before you sign anything.

Warning signs — call today, not next month

• Flashing check engine light — active misfire. Pull over and call us.
• Engine running rough, vibrating at idle, or shaking under load.
• Sudden drop in fuel economy.
• Smell of rotten eggs, fuel, or burning oil.
• Black, white, or blue smoke from the exhaust.
• Transmission slipping, banging into gear, or refusing to shift.
• Multiple warning lights on at once.

Why Family Automotive Center for diagnostics?

• Dealer-level scan tools covering domestic, Asian, and European vehicles.
• ASE-certified diagnostic technicians who train on the latest systems every year.
• Manufacturer service information — we read the same TSBs the dealer reads.
• Honest results — if it’s a $20 fix, that’s what we tell you. If it’s a $2,000 fix, we’ll show you the data so you understand why.
• Diagnostic charge applied to repair if you have us do the work.

Frequently asked questions