* Misfires: The problem might worsen, leading to misfires (causing rough running, poor fuel economy, and potentially damage to the catalytic converter). These misfires might not be consistently present.
* Complete Coil Failure: The faulty coil could fail completely, leaving you stranded.
* Further Damage: Continuing to drive with a failing ignition coil can stress other engine components.
Therefore, you should not ignore a PCM code 43, even if the car seems to be running fine. Here's what you should do:
1. Verify the Code: Double-check the code using a reliable OBD-II scanner. Ensure it's truly a code 43 (or its equivalent) and not a related but different code.
2. Inspect the Ignition Coil(s): Visually inspect the suspect ignition coil(s) for any obvious physical damage (cracks, burns, loose connections).
3. Check for Other Issues: Examine the spark plug wires connected to the coil for damage or corrosion. Also check the spark plugs themselves, replacing them if necessary (especially if they are old).
4. Consider Professional Diagnosis: If you're not comfortable working on your car's ignition system, take it to a qualified mechanic. They can properly diagnose the problem and determine the best course of action. They have tools to test the coil's performance more thoroughly than simple visual inspection.
5. Replacement (If Necessary): If the coil is faulty, replace it with a new, high-quality coil. Replacing the spark plug and wire associated with that coil is also often recommended during this process.
In short, while your car might be running fine for now, a code 43 is a warning sign of a potential problem that should be addressed to prevent future, more significant issues. Don't gamble with your car's reliability – get it checked.
