Toyota Sequoia rear O2 sensors loose due to nuts falling off causing popping out issue on Toyota Sequoia

Some Toyota Sequoia owners report experiencing issues with loose rear O2 sensors, which can lead to problems such as the sensors popping out of position. This situation arises when the sensors are not securely fastened, causing them to move and potentially affect their proper functioning. Owners may notice that malfunctioning O2 sensors can result in the engine running less efficiently, impacting the air-to-fuel ratio adjustments critical for optimal performance. Additionally, an illuminated check engine light may signal sensor failures, indicating the need for prompt attention. While these popping out issues are concerning, it is crucial for owners to differentiate them from other engine troubles, such as backfiring or rough running. Addressing the loose rear O2 sensors promptly is essential to maintain the vehicle's performance and efficiency.