Clearing the Service Engine Soon light on your Infiniti G35 isn’t just about turning off a warning—it’s about understanding what triggered it. This guide walks you through safe, effective methods using OBD2 scanners, battery disconnects, and professional tools, plus tips to prevent future issues.
Key Takeaways
- Diagnose before clearing: Always check the trouble codes first to identify the root cause of the light.
- Use an OBD2 scanner: This is the most reliable and recommended method for clearing the light on a G35.
- Avoid battery disconnect unless necessary: Disconnecting the battery can reset systems but may also erase important settings.
- Not all lights are equal: The “Service Engine Soon” light can indicate minor maintenance or serious engine problems.
- Reset after repairs: Only clear the light after fixing the underlying issue to avoid recurrence.
- Keep records: Document codes and repairs for future reference and resale value.
- When to see a mechanic: If the light returns quickly or flashes, seek professional help immediately.
How to Clear Service Engine Soon Light on Infiniti G35
If you’ve noticed the dreaded “Service Engine Soon” light glowing on your Infiniti G35 dashboard, don’t panic—but don’t ignore it either. This warning light, often confused with the “Check Engine” light (they’re the same on most models), is your car’s way of saying something needs attention. Whether it’s a loose gas cap or a more serious engine issue, understanding how to properly diagnose and clear the light is essential for keeping your G35 running smoothly.
In this guide, you’ll learn exactly how to clear the Service Engine Soon light on your Infiniti G35—safely and effectively. We’ll cover the best tools, step-by-step methods, and important precautions to take. You’ll also discover why simply clearing the light without fixing the problem is a bad idea. By the end, you’ll be equipped to handle this common issue like a pro.
Understanding the Service Engine Soon Light
Before you try to clear the light, it’s important to know what it means. The “Service Engine Soon” light is part of your G35’s onboard diagnostics system (OBD2), which monitors engine performance, emissions, and other critical systems. When a problem is detected, the car’s computer stores a diagnostic trouble code (DTC) and triggers the light.
Common causes include:
– A loose or faulty gas cap
– Oxygen sensor failure
– Mass airflow sensor issues
– Spark plug or ignition coil problems
– Catalytic converter inefficiency
– Exhaust gas recirculation (EGR) valve malfunction
The light can appear steady or flash. A steady light usually means a minor issue, while a flashing light indicates a severe problem—like engine misfire—that can damage the catalytic converter if not addressed immediately.
Tools You’ll Need
To clear the Service Engine Soon light on your Infiniti G35, you’ll need one or more of the following tools:
- OBD2 Scanner: The most effective and recommended tool. Affordable models start around $20 and plug into the OBD2 port under the dashboard.
- Smartphone with OBD2 App: Pair a Bluetooth OBD2 adapter (like BlueDriver or OBD Fusion) with your phone for wireless diagnostics.
- Multimeter: Useful for testing sensors or electrical connections if you’re troubleshooting manually.
- Basic Hand Tools: Screwdrivers, wrenches, and pliers may be needed if repairs are required before clearing the light.
Method 1: Using an OBD2 Scanner (Recommended)
The safest and most accurate way to clear the Service Engine Soon light is with an OBD2 scanner. This method allows you to read the trouble codes, understand the problem, and clear the light after repairs.
Step 1: Locate the OBD2 Port
The OBD2 port in your Infiniti G35 is usually located under the dashboard on the driver’s side. It’s a 16-pin connector, often near the steering column. You may need to crouch down or use a flashlight to find it.
Visual guide about How to Clear Service Engine Soon Light on Infiniti G35
Image source: youcanic.com
Step 2: Plug in the Scanner
Turn off the ignition, then plug the OBD2 scanner into the port. Make sure it’s securely connected. Some scanners power on automatically; others require you to turn the ignition to the “ON” position (without starting the engine).
Step 3: Read the Trouble Codes
Follow the scanner’s instructions to retrieve the diagnostic trouble codes (DTCs). Common codes for the G35 include P0420 (catalytic converter efficiency) or P0171 (system too lean). Write down the codes—they’ll help you diagnose the issue.
Step 4: Address the Underlying Problem
Don’t clear the light yet! Use the codes to identify and fix the problem. For example, if the code points to a loose gas cap, tighten or replace it. If it’s an oxygen sensor, you may need to replace it. Skipping this step means the light will likely return.
Step 5: Clear the Codes
Once the issue is resolved, use the scanner’s “Clear Codes” or “Erase DTCs” function. This resets the engine control unit (ECU) and turns off the Service Engine Soon light. Wait a few seconds, then turn off the ignition and unplug the scanner.
Step 6: Test Drive
Start your G35 and take it for a short drive. If the light stays off, the problem is resolved. If it returns, there may be an ongoing issue that needs further diagnosis.
Method 2: Disconnecting the Battery (Not Recommended)
Some people try to clear the light by disconnecting the car battery. While this can work, it’s not the best method and comes with risks.
How It Works
Disconnecting the battery cuts power to the ECU, which may reset the system and clear stored codes. However, this method doesn’t fix the underlying problem—it only resets the computer.
Steps to Disconnect the Battery
- Turn off the ignition and remove the key.
- Locate the negative terminal on the battery (marked with a “-” sign).
- Use a wrench to loosen the clamp and remove the negative cable.
- Wait at least 15–30 minutes to ensure the ECU fully resets.
- Reconnect the cable and tighten the clamp.
- Start the car and check if the light is off.
Risks and Drawbacks
This method can erase important settings like radio presets, climate control preferences, and adaptive transmission learning. It also won’t work if the problem persists—the light will likely return after a few drive cycles. Use this only as a last resort.
Method 3: Using a Smartphone and Bluetooth OBD2 Adapter
For tech-savvy owners, a Bluetooth OBD2 adapter paired with a smartphone app offers a convenient and powerful solution.
Step 1: Get the Right Tools
Purchase a compatible Bluetooth OBD2 adapter (like BlueDriver or Veepeak) and download a free app such as Torque Pro (Android) or OBD Fusion (iOS).
Step 2: Pair the Device
Plug the adapter into the OBD2 port, turn on the ignition, and pair it with your phone via Bluetooth. Open the app and follow the setup instructions.
Step 3: Read and Clear Codes
Use the app to scan for trouble codes. Most apps display the code, a description, and possible causes. After fixing the issue, use the app’s “Clear Codes” feature to reset the light.
Advantages
This method is portable, user-friendly, and often includes live data monitoring. You can track engine performance in real time and catch issues early.
Troubleshooting Common Issues
Even after clearing the light, it may return. Here’s how to handle common scenarios:
Light Comes Back On
If the Service Engine Soon light reappears, the problem wasn’t fully resolved. Re-scan for codes and double-check your repairs. Some issues, like a failing catalytic converter, may require professional diagnosis.
Light Flashes While Driving
A flashing light indicates a severe misfire. Pull over safely, turn off the engine, and call a tow truck. Continuing to drive can cause expensive damage to the catalytic converter.
No Codes Found
If your scanner shows “No Codes,” the light may have been triggered by a temporary glitch. Drive the car for a few days. If the light stays off, no action is needed. If it returns, investigate further.
Scanner Won’t Connect
Check that the ignition is on, the scanner is compatible with your G35, and the OBD2 port is clean and undamaged. Try a different scanner or port if available.
Preventing Future Service Engine Soon Lights
The best way to avoid dealing with the light is to prevent it from coming on in the first place. Here are some tips:
- Regular Maintenance: Follow your G35’s maintenance schedule—oil changes, air filter replacements, and spark plug checks.
- Tighten the Gas Cap: After every fill-up, make sure the gas cap clicks securely.
- Use Quality Fuel: Stick to reputable gas stations to avoid contaminants.
- Listen to Your Car: Unusual noises, poor acceleration, or rough idling can signal trouble before the light comes on.
- Keep an OBD2 Scanner Handy: Early detection saves time and money.
When to See a Mechanic
While many Service Engine Soon issues can be handled at home, some require professional help. Visit a certified mechanic if:
– The light flashes or stays on after repairs
– You’re unsure how to interpret the trouble codes
– The problem involves complex systems like the transmission or emissions
– You don’t have the tools or confidence to fix it yourself
Infiniti dealerships and independent shops with Nissan/Infiniti experience are your best bet for accurate diagnosis and repair.
Conclusion
Clearing the Service Engine Soon light on your Infiniti G35 doesn’t have to be intimidating. With the right tools and knowledge, you can safely diagnose and reset the warning—keeping your car in top shape. Always start by reading the trouble codes, fix the underlying issue, and then clear the light using an OBD2 scanner. Avoid shortcuts like battery disconnects unless absolutely necessary.
Remember, the light is there to protect your engine and emissions system. Ignoring it can lead to costly repairs down the road. Stay proactive, keep your maintenance up to date, and your G35 will reward you with years of reliable performance.
By following this guide, you’re not just turning off a light—you’re taking control of your car’s health.