This guide walks you through how to reset the service engine soon light on an Infiniti FX35 using both manual methods and OBD2 scanners. Whether the light came on due to routine maintenance or a minor issue, you’ll learn safe, effective ways to clear it and keep your luxury SUV running smoothly.
Quick Answers to Common Questions
Tip/Question?
Can I reset the service engine light without a scanner?
Yes, on 2003–2008 Infiniti FX35 models, you can use the manual method with the trip odometer button. However, a scanner is more reliable and recommended for accurate diagnostics.
Tip/Question?
How long does it take for the light to reset?
The manual method takes about 30 seconds. With an OBD2 scanner, clearing codes takes just a few minutes once connected.
Tip/Question?
Will resetting the light affect my emissions test?
Yes. If the light is on during an emissions test, you’ll fail. Always reset and drive the vehicle for a few days to complete drive cycles before testing.
Tip/Question?
What if the light flashes instead of staying on?
A flashing light indicates a severe misfire that can damage the catalytic converter. Stop driving immediately and have the vehicle towed to a mechanic.
Tip/Question?
Can I use my phone to reset the light?
Yes, with a Bluetooth OBD2 scanner like BlueDriver. The app reads and clears codes directly from your smartphone.
How to Reset Service Engine Soon Light on Infiniti FX35
If you own an Infiniti FX35, you know it’s a powerful, stylish luxury SUV that blends performance with comfort. But like any vehicle, it occasionally sends signals that something needs attention—like the dreaded “Service Engine Soon” light. This amber warning on your dashboard can cause anxiety, especially if you’re not sure what’s causing it. The good news? In many cases, you can reset this light yourself—safely and effectively—without a trip to the dealership.
In this comprehensive guide, you’ll learn exactly how to reset the service engine soon light on your Infiniti FX35. We’ll cover why the light comes on, how to diagnose the issue, and two proven methods to clear it: a manual reset (for compatible models) and using an OBD2 scanner (the most reliable option). You’ll also get practical tips, troubleshooting advice, and answers to common questions so you can keep your FX35 running smoothly.
Whether you’re a DIY enthusiast or just want to save money on mechanic visits, this step-by-step guide will give you the confidence to handle this common issue like a pro.
Why Does the Service Engine Soon Light Come On?
Before you reset the light, it’s important to understand what it means. The “Service Engine Soon” light—also known as the Malfunction Indicator Lamp (MIL)—is part of your FX35’s onboard diagnostic system (OBD2). When the engine control unit (ECU) detects a problem that could affect emissions or performance, it triggers this light.
Common causes include:
- Loose or damaged gas cap: This is the #1 cause of a false alarm. If the cap isn’t sealed properly, fuel vapors escape, triggering the light.
- Oxygen (O2) sensor failure: These sensors monitor exhaust gases. A faulty one can reduce fuel efficiency and increase emissions.
- Spark plug or ignition coil issues: Misfires can cause the light to come on and lead to poor performance.
- Catalytic converter problems: A failing converter can trigger the light and reduce engine power.
- Mass airflow (MAF) sensor dirt or damage: This sensor measures incoming air. If it’s dirty or broken, the engine runs poorly.
- Evaporative emissions system leak: A small leak in the fuel vapor system can set off the light.
The key takeaway? Never reset the light without addressing the root cause. If you ignore a real problem, you risk damaging your engine or failing an emissions test.
Method 1: Manual Reset (For 2003–2008 Infiniti FX35 Models)
Some older Infiniti FX35 models (typically 2003 to 2008) allow you to reset the service engine light manually—without any tools. This method works best if the light came on due to routine maintenance (like an oil change) and the issue has been resolved.
Note: This method may not work on 2009 and newer FX35 models, which often require an OBD2 scanner. Always check your owner’s manual or try the scanner method if the manual reset fails.
Step 1: Ensure the Problem Is Fixed
Before resetting, make sure the issue that triggered the light is resolved. For example:
- If you just changed the oil, confirm the oil level is correct and the cap is tight.
- If the gas cap was loose, tighten it securely until it clicks 3–5 times.
- If you replaced a sensor or part, double-check the installation.
Resetting the light while a problem persists will only cause it to come back—and possibly worsen the underlying issue.
Step 2: Turn Off the Engine and Access the Dashboard
Make sure your FX35 is parked on a level surface, the engine is off, and the key is removed from the ignition. This prevents accidental starts and ensures safety.
Locate the trip odometer button on your instrument cluster. It’s usually a small button near the speedometer, labeled “TRIP” or “ODO/TRIP.”
Step 3: Press and Hold the Trip Odometer Button
With the ignition off, press and hold the trip odometer button. Keep it held down throughout the next steps.
Step 4: Turn the Ignition to “ON” (Do Not Start the Engine)
While still holding the trip button, turn the key to the “ON” position. You’ll see the dashboard lights illuminate, but the engine should not start. Hold the button for about 10–15 seconds.
Step 5: Watch for the Light to Flash
After holding the button and turning the ignition on, the “Service Engine Soon” light should begin to flash. This indicates the system is in reset mode.
Continue holding the trip button until the light stops flashing and turns off completely. This may take up to 30 seconds.
Step 6: Release the Button and Turn Off the Ignition
Once the light is off, release the trip odometer button. Turn the key back to the “OFF” position and remove it.
Step 7: Start the Engine to Confirm
Start your FX35. If the reset was successful, the “Service Engine Soon” light should remain off. If it comes back on immediately, the issue may not be resolved—or your model may not support manual reset.
Pro Tip: If the light returns after a few miles, use an OBD2 scanner to read the trouble code and diagnose the problem properly.
Method 2: Using an OBD2 Scanner (Recommended for All Models)
For the most reliable and accurate reset—especially on 2009 and newer Infiniti FX35 models—an OBD2 scanner is the best tool. It reads diagnostic trouble codes (DTCs), tells you exactly what’s wrong, and allows you to clear the light permanently.
Even if you used the manual method, using a scanner ensures the issue is truly fixed and gives you peace of mind.
Step 1: Choose the Right OBD2 Scanner
You don’t need a professional-grade tool. Affordable, user-friendly scanners work great for home use. Recommended options include:
- BlueDriver Bluetooth Scanner: Pairs with your smartphone via app. Reads and clears codes, shows live data, and provides repair suggestions.
- Autel MaxiCOM MK808: A mid-range scanner with advanced features, ideal for serious DIYers.
- Innova 3160g: Easy to use, with code reading, clearing, and ABS/SRS diagnostics.
Most scanners cost between $50 and $150 and are worth the investment if you plan to maintain your FX35 long-term.
Step 2: Locate the OBD2 Port
In the Infiniti FX35, the OBD2 port is typically located under the dashboard, near the driver’s side knee panel. It’s a 16-pin connector, usually black or gray.
To access it:
- Kneel or crouch in the driver’s footwell.
- Look up under the dashboard, near the steering column.
- The port is often covered by a small plastic panel—gently pull it off.
Tip: If you can’t find it, consult your owner’s manual or search online for “Infiniti FX35 OBD2 port location.”
Step 3: Plug in the Scanner
With the engine off, plug the OBD2 scanner into the port. Make sure it’s fully seated and secure.
If using a Bluetooth scanner like BlueDriver, open the companion app on your phone and pair it with the device.
Step 4: Turn the Ignition to “ON”
Turn the key to the “ON” position (do not start the engine). This powers the scanner and allows it to communicate with the ECU.
Wait a few seconds for the scanner to initialize and connect.
Step 5: Read the Trouble Codes
Follow the scanner’s instructions to read the diagnostic trouble codes (DTCs). These codes (like P0420 or P0171) tell you exactly what system is malfunctioning.
Write down the codes or take a screenshot if using a smartphone app.
Example: Code P0420 means “Catalytic Converter Efficiency Below Threshold”—a common issue in older FX35s.
Step 6: Address the Underlying Issue
Before clearing the light, fix the problem. For example:
- If the code is P0442 (small EVAP leak), check the gas cap and hoses.
- If it’s P0300 (random misfire), inspect spark plugs and ignition coils.
- If it’s P0133 (O2 sensor slow response), consider replacing the sensor.
Use online resources or repair manuals to guide your fix. If you’re unsure, consult a mechanic.
Step 7: Clear the Codes and Reset the Light
Once the issue is resolved, use the scanner to clear the trouble codes. On most devices, this is as simple as selecting “Clear Codes” or “Erase DTCs.”
The scanner will send a command to the ECU to turn off the “Service Engine Soon” light.
Step 8: Verify the Reset
Turn the ignition off, then start the engine. The light should remain off. Drive the vehicle for a few miles to ensure the system completes its self-checks.
If the light returns, the problem may not be fully fixed—or a new issue has emerged.
Pro Tip: Some scanners allow you to view live data (like engine RPM, oxygen sensor readings, and fuel trim). Use this to confirm repairs are working.
Troubleshooting Common Reset Issues
Even with the right method, you might run into problems. Here’s how to handle common issues:
The Light Won’t Turn Off After Reset
- Cause: The underlying problem wasn’t fixed.
- Solution: Re-scan for codes and address the root cause. Don’t keep resetting without repairs.
Manual Reset Doesn’t Work
- Cause: Your FX35 model may not support manual reset (common in 2009+ models).
- Solution: Use an OBD2 scanner instead.
Scanner Won’t Connect
- Cause: Loose connection, dead battery, or incompatible scanner.
- Solution: Check the OBD2 port for debris, ensure the ignition is on, and try a different scanner if needed.
Light Comes Back On After a Few Days
- Cause: Intermittent issue or incomplete repair.
- Solution: Monitor driving conditions. If the light returns, have a professional diagnose it.
Safety Tips and Best Practices
Resetting the service engine light is generally safe, but follow these guidelines:
- Never reset the light while driving. Always do it with the engine off.
- Wear safety glasses when working under the dashboard.
- Use a code reader you understand. Read the manual before use.
- Keep a record of trouble codes for future reference or mechanic visits.
- Don’t ignore persistent lights. If the light flashes (not just stays on), it indicates a severe misfire—stop driving and get help immediately.
Conclusion
Resetting the “Service Engine Soon” light on your Infiniti FX35 doesn’t have to be stressful or expensive. With the right approach, you can safely clear the light and keep your luxury SUV in top condition.
For older models (2003–2008), the manual reset method using the trip odometer button can work—if the issue is resolved. But for all models, especially 2009 and newer, an OBD2 scanner is the most reliable and informative tool. It not only clears the light but also helps you understand what’s really going on under the hood.
Remember: The light is your vehicle’s way of asking for help. Always diagnose the problem before resetting. A loose gas cap is easy to fix, but a failing catalytic converter isn’t. Addressing issues early saves money and keeps your FX35 running smoothly for years to come.
By following this guide, you’re not just resetting a light—you’re taking control of your vehicle’s health. Stay proactive, use the right tools, and enjoy the confidence that comes with being a knowledgeable car owner.