Catalytic Converter false alarms on 99 Accord?

The 1999 Honda Accord is not known to have any widespread issues with false catalytic converter alarms. However, there are a few things that could cause a false alarm:

- O2 sensor malfunction. Oxygen sensors monitor the amount of oxygen in the exhaust. A faulty O2 sensor can send incorrect signals to the engine control unit (ECU), which can cause it to activate the catalytic converter alarm.

- Faulty wiring. Damaged or loose wiring can also cause false catalytic converter alarms.

- Exhaust leaks. Exhaust leaks can cause the ECU to think that the catalytic converter is not working properly, triggering the alarm.

If you're experiencing a catalytic converter false alarm on your 1999 Honda Accord, it's important to have the vehicle diagnosed by a qualified mechanic to determine the cause.