To address a Check Engine light and potentially pass emissions, you need to diagnose and fix the underlying problem, not just reset the code. Here's why and what to do:
* Ignoring the Problem: Simply clearing the code without fixing the problem won't solve the underlying issue causing the emissions failure. The problem will likely return, and you'll still fail the test.
* OBD-II Scanner: You'll need an OBD-II scanner (available at most auto parts stores) to read the diagnostic trouble codes stored in your Neon's PCM. This scanner will tell you *what* is causing the Check Engine light. The code(s) will provide clues as to the specific malfunction.
* Repairing the Problem: Once you know the code(s), you can troubleshoot and fix the problem. This might involve:
* Replacing a sensor: Oxygen sensor (O2 sensor), mass airflow sensor (MAF sensor), etc., are common culprits.
* Fixing a leak: Vacuum leaks can significantly impact emissions.
* Replacing a faulty component: Catalytic converter, ignition system problems, etc., can also cause emissions failures.
* Professional Help: If you're not comfortable diagnosing and repairing the problem yourself, take your Neon to a qualified mechanic. They have the tools and expertise to diagnose and fix the issue efficiently.
Battery Disconnection (Ineffective for Emissions):
While disconnecting the battery for a period of time *might* clear some codes temporarily, it's not reliable for emissions-related codes and is unlikely to work on a 1998 Neon. The PCM often retains codes even after this procedure.
In short, focusing on repairing the actual cause of the Check Engine light (as determined by the OBD-II codes) is the only reliable way to pass emissions. Simply trying to reset the computer without fixing the underlying problem is a waste of time and money.
