Here's a breakdown of how to approach the situation:
1. Diagnose the Problem:
* Get the Diagnostic Trouble Code (DTC): You need to know *why* the check engine light is on. You can do this in a few ways:
* OBD-II Scanner: This is the best option. Buy a cheap OBD-II code reader from an auto parts store. Plug it into your car's OBD-II port (usually under the dashboard), and it will read the trouble codes. Note down the code(s).
* Auto Parts Store: Most auto parts stores will scan your car for free and tell you the code(s).
* Research the Code(s): Once you have the code(s), search online (e.g., using Google) for their meaning. This will tell you what the car's computer thinks is wrong.
2. Addressing the Potential Cause (Likely Related to the Cold Air Intake):
The most common reason a cold air intake triggers a check engine light is because:
* MAF Sensor Issues: The cold air intake may be disrupting the airflow to the MAF sensor, causing inaccurate readings. This is the most probable cause. Ensure the MAF sensor is correctly seated and clean. A dirty or improperly positioned MAF sensor can send faulty readings. Use MAF sensor cleaner (available at auto parts stores) and follow the instructions carefully. *Never touch the sensor element itself.*
* Improper Installation: Double-check your cold air intake installation. Make sure all connections are secure, clamps are tight, and nothing is obstructing airflow. A leak in the intake system can also cause problems.
* Incorrect Calibration (Some Intakes): Some cold air intakes require tuning or calibration of the car's computer. If your intake kit came with instructions suggesting this, you may need to have it professionally tuned or use tuning software.
3. Resetting the Check Engine Light (Only After Addressing the Problem):
* Disconnect the Battery: This is the simplest method. Disconnect the negative (-) battery terminal for about 10-15 minutes. This will reset the computer's memory. Reconnect the battery and start the car. The light may stay on for a drive cycle (or two) as the car relearns parameters.
* OBD-II Scanner: Many OBD-II scanners have a "clear codes" function. This is a more precise way to clear the codes.
Important Considerations:
* Warranty: If your Mustang is still under warranty, installing an aftermarket cold air intake might void it. The dealership will likely know about the intake if the check engine light is on due to it.
* Professional Help: If you're uncomfortable diagnosing and fixing the problem yourself, take your car to a qualified mechanic. They have the tools and expertise to properly diagnose and resolve the issue.
Do not simply reset the check engine light without figuring out why it's on. Ignoring the problem could lead to further damage to your engine.
