Yes, you can technically drive with a bad oxygen (O2) sensor, but it's not recommended for several reasons:

Decreased fuel efficiency: A malfunctioning O2 sensor can lead to an incorrect air-fuel mixture, causing the engine to run rich or lean. This can result in decreased fuel efficiency and potentially higher fuel consumption.

Emissions issues: A faulty O2 sensor can cause the vehicle to produce higher emissions than normal. This can lead to a failed emissions test in regions where vehicles are required to pass emissions inspections.

Engine performance: A bad O2 sensor can negatively impact engine performance, leading to rough idling, hesitation, or stalling. In severe cases, it may even cause engine misfires or damage to other components.

Potential damage to catalytic converter: An O2 sensor that is not functioning properly may cause the catalytic converter to overheat or become damaged due to an incorrect air-fuel mixture. Catalytic converter replacement can be costly.

While it is possible to drive with a bad O2 sensor for a short period, it's best to address the issue as soon as possible to prevent further damage to the vehicle and ensure optimal performance and fuel efficiency. If you suspect that your O2 sensor is faulty, it's recommended to have it inspected and replaced by a qualified mechanic.