Infiniti Check Engine Light Services in Tustin

Performance and precision are the hallmarks of the Infiniti experience. When a warning light interrupts your drive in your QX50, QX55, QX60, QX80, or Q50, it is more than a distraction—it is a communication from your vehicle's sophisticated onboard diagnostic system.

At AutoNation INFINITI Tustin, we understand that your time is valuable and your vehicle's integrity is paramount. While a check engine light (CEL) can trigger for over 3,000 different OBD-II codes, our factory-trained technicians in Tustin utilize specialized Infiniti diagnostic software to pinpoint the exact requirement of your vehicle.

Common Causes & Expert Solutions

• Evaporative Emission (EVAP) System / Loose Gas Cap The Issue: A leak in the sealed system that contains fuel vapors. Often, this is a simple loose or cracked gas cap, but it can also indicate a failing charcoal canister.
  The Fix: We perform a pressure test of the fuel system. Fixes range from a genuine Infiniti gas cap replacement to purging the EVAP lines.
• Catalytic Converter Integrity The Issue: Over time, the precious metals inside the converter can degrade or become "poisoned" by engine misfires, leading to failed emissions and restricted exhaust flow.
  The Fix: If the converter is failing, we replace it with an OEM unit to ensure your Infiniti meets California’s strict emissions standards and maintains its signature exhaust note.
• Ignition Coil & Spark Plug Wear The Issue: High-performance Infiniti engines require precise ignition. Worn plugs or failing "coil-on-plug" units cause rough idling and decreased fuel velocity.
  The Fix: A comprehensive ignition tune-up using laser-platinum or iridium spark plugs specifically gapped for your Infiniti engine model.
• Oxygen (O2) Sensor Malfunction The Issue: These sensors monitor the oxygen level in your exhaust to regulate fuel injection. A faulty sensor leads to "rich" or "lean" running conditions, potentially damaging your engine.
  The Fix: Precision replacement of the upstream or downstream sensors to restore optimal MPG and engine smoothness.
• Mass Air Flow (MAF) Sensor Contamination The Issue: Common in the dusty Southern California climate, particles can coat the MAF sensor, tricking the computer into improper fuel delivery.
  The Fix: Professional cleaning of the sensor element or a full replacement if the delicate internal hot-wire is damaged.

Why Choose AutoNation INFINITI Tustin for Your Infiniti Service?

Your Infiniti is a masterpiece of Japanese engineering. Don't trust a generic "code reader" at a local parts store that only gives you half the story. Our Tustin service center provides a transparent, white-glove experience, ensuring your luxury vehicle returns to the road in peak condition with a documented service history that preserves its resale value.