What happens when the 02 sensor go bad?

When an O2 sensor goes bad, it can lead to incorrect readings of the oxygen levels in the exhaust gases, causing the engine control unit (ECU) to miscalculate the air-fuel mixture. This may result in decreased fuel efficiency, increased emissions, and poor engine performance. Additionally, a failing O2 sensor can trigger the check engine light and potentially damage other engine components over time if not addressed. Regular maintenance and timely replacement of a faulty O2 sensor are essential for optimal vehicle performance.