If your Infinity Q50 check engine light is on, don’t panic—you can read the trouble code yourself. This guide walks you through using an OBD2 scanner, checking for loose gas caps, and understanding what the code means. Save time and money by diagnosing the issue at home.
Key Takeaways
- Use an OBD2 scanner: This tool reads diagnostic trouble codes (DTCs) from your Q50’s onboard computer and is the most reliable way to get accurate information.
- Check the gas cap first: A loose or damaged gas cap is a common cause of the check engine light and can trigger a false code.
- Locate the OBD2 port under the dashboard: In the Infinity Q50, it’s usually found near the driver’s knee panel, below the steering wheel.
- Understand code formats: DTCs follow a standard format (e.g., P0420), where the first character indicates the system, and the rest specify the issue.
- Clear codes after repair: Once the issue is fixed, use the scanner to reset the light and confirm the problem is resolved.
- Seek professional help for complex codes: Some issues require advanced diagnostics or parts replacement best handled by a certified technician.
- Keep a code log: Recording past codes helps track recurring problems and improves communication with mechanics.
How to Get Code for Infinity Q50 Check Engine Light
Seeing the check engine light pop up on your Infinity Q50 dashboard can be stressful. It’s like your car is waving a red flag, but you’re not sure what it means. Is it serious? Can you drive safely? Should you call a mechanic right away?
The good news? You don’t have to guess. Most check engine light issues can be diagnosed at home with the right tools and a little know-how. In this guide, we’ll walk you through exactly how to get the code for your Infinity Q50 check engine light—step by step. Whether you’re a DIY enthusiast or just want to save on diagnostic fees, this guide will help you understand what’s going on under the hood.
By the end of this article, you’ll know how to use an OBD2 scanner, interpret diagnostic trouble codes, and take the right next steps—whether that’s tightening a gas cap or scheduling a repair. Let’s get started.
Why Is the Check Engine Light On?
Before diving into how to get the code, it helps to understand why the light comes on in the first place. The check engine light—also known as the malfunction indicator lamp (MIL)—is part of your Q50’s onboard diagnostic system (OBD2). This system constantly monitors engine performance, emissions, fuel efficiency, and other critical functions.
Visual guide about How to Get Code for Infinity Q50 Check Engine Light
Image source: images.simplepart.com
When something goes outside normal parameters, the computer stores a diagnostic trouble code (DTC) and triggers the light. The issue could be minor—like a loose gas cap—or more serious, such as a failing oxygen sensor or catalytic converter.
Common causes include:
- Loose or faulty gas cap
- Faulty oxygen (O2) sensor
- Mass airflow (MAF) sensor issues
- Catalytic converter problems
- Spark plug or ignition coil failure
- Evaporative emissions system leaks
Don’t ignore the light. Even if your car seems to run fine, underlying issues can reduce fuel efficiency, increase emissions, or lead to more expensive repairs down the road.
Tools You’ll Need to Read the Code
To get the code for your Infinity Q50 check engine light, you’ll need just a few basic tools. The most important is an OBD2 scanner. Here’s what you should have:
1. OBD2 Scanner
This handheld device plugs into your car’s OBD2 port and communicates with the engine control unit (ECU) to retrieve stored trouble codes. There are three main types:
- Basic code readers: Affordable (under $30), they read and clear codes but offer limited details.
- Mid-range scanners: Cost $50–$100, they provide more detailed descriptions, freeze frame data, and sometimes live sensor readings.
- Advanced scanners: Priced over $150, these offer full system diagnostics, graphing, and compatibility with multiple vehicle brands.
For most Q50 owners, a mid-range scanner is ideal. Popular models include the BlueDriver Bluetooth Scanner (works with smartphones) or the Autel MaxiCOM MK808 for more advanced users.
2. Smartphone (Optional)
If you choose a Bluetooth OBD2 scanner, you’ll need a smartphone with a compatible app. Apps like Torque Pro (Android) or OBD Fusion (iOS) display codes, graphs, and even real-time engine data.
3. Flashlight
The OBD2 port is often tucked away under the dashboard. A small flashlight helps you locate it quickly, especially in low light.
4. Pen and Paper (or Phone Notes)
Write down the code(s) you retrieve. This helps you research the issue or share it with a mechanic later.
Step-by-Step: How to Get the Code for Your Infinity Q50 Check Engine Light
Now that you have your tools, let’s walk through the process of retrieving the diagnostic code. It’s easier than you think—and takes less than 10 minutes.
Step 1: Turn Off the Engine
Make sure your Infinity Q50 is completely off. Remove the key or press the start button to shut down the engine. This ensures a clean connection when you plug in the scanner.
Step 2: Locate the OBD2 Port
The OBD2 port is a 16-pin connector usually found under the dashboard on the driver’s side. In the Infinity Q50, it’s typically located:
- Below the steering wheel
- Near the knee panel or fuse box
- Sometimes behind a small cover or flap
Look for a trapezoid-shaped plug with multiple pins inside. It’s often black or gray and may have a label nearby saying “OBD” or “Diagnostics.” If you can’t find it, consult your owner’s manual or search online for “Infinity Q50 OBD2 port location.”
Step 3: Plug in the OBD2 Scanner
Insert the scanner’s plug firmly into the OBD2 port. Make sure it’s fully seated—there should be no wiggle. If you’re using a Bluetooth scanner, ensure it’s charged and paired with your phone.
Step 4: Turn the Ignition to “On” (But Don’t Start the Engine)
Turn the key to the “ON” position (or press the start button without pressing the brake). This powers up the car’s electrical system and allows the scanner to communicate with the ECU. The dashboard lights will illuminate, but the engine should remain off.
Step 5: Power On the Scanner
Press the power button on your OBD2 scanner. Most devices will automatically detect the vehicle and begin scanning. If using a Bluetooth scanner, open the app on your phone and wait for it to connect.
Step 6: Read the Trouble Code
Follow the on-screen prompts to retrieve the code. On basic scanners, press “Read” or “Scan.” On smartphone apps, tap “Get DTCs” or “Scan for Codes.”
The scanner will display one or more diagnostic trouble codes (DTCs). These codes follow a standard format:
- P0xxx: Powertrain (engine/transmission)
- P1xxx: Manufacturer-specific powertrain codes
- B0xxx: Body (airbags, climate, etc.)
- C0xxx: Chassis (ABS, suspension)
- U0xxx: Network/communication issues
For example, a common code like P0420 means “Catalyst System Efficiency Below Threshold.” This usually points to a failing catalytic converter.
Step 7: Record the Code(s)
Write down the full code(s) displayed. Some scanners show multiple codes—record them all. Also note any additional information, such as “pending” or “confirmed” status, or freeze frame data (engine conditions when the code was set).
Step 8: Research the Code
Use the code to look up the issue. You can:
- Search online (e.g., “P0420 Infinity Q50 meaning”)
- Check the scanner’s built-in code library
- Use apps like OBD Auto Doctor or websites like OBD-Codes.com
Understanding the code helps you decide whether it’s something you can fix yourself or if you need a mechanic.
Common Infinity Q50 Check Engine Light Codes
While every code is unique, some appear more frequently in the Infinity Q50. Here are a few common ones and what they mean:
P0420 – Catalyst System Efficiency Below Threshold
This code indicates the catalytic converter isn’t reducing emissions as effectively as it should. Causes include a failing converter, oxygen sensor issues, or engine misfires. In the Q50, this often appears after 80,000–100,000 miles.
P0171 – System Too Lean (Bank 1)
The engine is running with too much air and not enough fuel. Possible causes: vacuum leak, dirty MAF sensor, or faulty fuel injector. Common in Q50s with high mileage or after intake modifications.
P0300 – Random/Multiple Cylinder Misfire Detected
The engine is misfiring across multiple cylinders. Could be due to bad spark plugs, ignition coils, or fuel system problems. The Q50’s V6 engine is prone to coil failures over time.
P0442 – Evaporative Emission Control System Leak Detected (Small Leak)
Often caused by a loose or cracked gas cap. Check the cap first—tighten it or replace it if damaged. If the light returns, inspect EVAP system hoses and valves.
P0128 – Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
The engine isn’t reaching optimal operating temperature quickly. Usually due to a stuck-open thermostat. Common in colder climates.
Knowing these common codes can help you act faster and avoid unnecessary repairs.
What to Do After Getting the Code
Once you have the code, your next steps depend on the issue. Here’s how to proceed:
If It’s a Simple Fix (e.g., Gas Cap)
Tighten or replace the gas cap, then clear the code using your scanner. Drive the car for a few days. If the light doesn’t return, the issue is resolved.
If It’s a Sensor or Component Issue
Research whether the part is DIY-friendly. For example, replacing an oxygen sensor or spark plugs is doable with basic tools. But if it involves the catalytic converter or transmission, consult a professional.
If You’re Unsure or the Code Is Complex
Take the code to a trusted mechanic or dealership. Share the code and any notes you’ve taken. This saves them time and reduces diagnostic fees.
Clear the Code (After Repair)
Once the issue is fixed, use your scanner to clear the code. On most devices, go to “Clear Codes” or “Reset MIL.” This turns off the check engine light. If the problem is truly fixed, the light should stay off.
Note: Clearing the code without fixing the issue will only turn the light off temporarily. It will return once the ECU detects the problem again.
Troubleshooting Tips and Common Mistakes
Even with the right tools, things can go wrong. Here are some tips to avoid common pitfalls:
1. Don’t Ignore the Gas Cap
Up to 20% of check engine lights are caused by a loose or damaged gas cap. Always check it first—it’s free and takes 30 seconds.
2. Ensure the Scanner Is Compatible
Make sure your OBD2 scanner works with Asian vehicles. Some cheap models only support domestic cars. Look for “OBD2 compliant” and “supports all 10 modes.”
3. Wait for the Scanner to Fully Connect
Don’t rush the process. Give the scanner 10–15 seconds to communicate with the ECU. Interrupting it can cause errors or incomplete readings.
4. Don’t Clear Codes Immediately
Always record the code before clearing it. Once cleared, you lose valuable diagnostic information.
5. Watch for “Pending” Codes
Some scanners show “pending” codes—these haven’t triggered the light yet but may soon. Monitor them, especially after recent repairs.
6. Be Cautious with Aftermarket Parts
Using non-OEM sensors or parts can cause false codes or compatibility issues. Stick to reputable brands like Bosch, Denso, or OEM Infinity parts.
When to See a Mechanic
While many check engine light issues are DIY-friendly, some require professional attention. See a mechanic if:
- The code points to transmission, ABS, or airbag systems
- You suspect electrical or wiring problems
- The light is flashing (indicates a severe misfire that can damage the catalytic converter)
- You’ve tried basic fixes but the light keeps returning
- You don’t have the tools or confidence to perform the repair
Infinities are luxury vehicles with complex systems. When in doubt, it’s better to get a professional diagnosis—especially if the repair involves the engine, emissions, or safety systems.
Preventing Future Check Engine Light Issues
An ounce of prevention is worth a pound of cure. Here’s how to reduce the chances of the check engine light coming on:
- Follow the maintenance schedule: Replace spark plugs, air filters, and fluids on time.
- Use quality fuel: Top-tier gasoline with detergents helps keep injectors clean.
- Inspect hoses and belts: Look for cracks, leaks, or wear during oil changes.
- Keep the gas cap tight: Always hand-tighten it until it clicks.
- Address minor issues early: A small vacuum leak can become a big problem if ignored.
Regular maintenance not only prevents check engine lights but also extends the life of your Q50.
Conclusion
Getting the code for your Infinity Q50 check engine light doesn’t have to be intimidating. With an OBD2 scanner and a few simple steps, you can diagnose the issue yourself—saving time, money, and stress. Whether it’s a loose gas cap or a failing sensor, understanding the code puts you in control.
Remember: the check engine light is your car’s way of asking for help. Don’t ignore it. Read the code, research the issue, and take action. And when in doubt, consult a professional.
By following this guide, you’re not just fixing a light—you’re becoming a more informed and confident car owner. Now go grab that scanner and take charge of your Q50’s health.