P1153 2018 Chevrolet Silverado Code - HO2S Insufficient Switching Bank 2 Sensor 1

P1153 indicates "HO2S Insufficient Switching Bank 2 Sensor 1," which means the oxygen sensor in front of the catalytic converter on Bank 2 is not switching between rich and lean as expected.

Symptoms may include reduced fuel efficiency, rough idling, engine hesitation, the check engine light turning on, and possible emissions test failure.

Common causes include a faulty Bank 2 Sensor 1 oxygen sensor, exhaust leaks, wiring issues, or engine performance problems like a vacuum leak or unbalanced air-fuel ratio.

Bank 2 refers to the side of the engine with cylinder 2. In a V8 Silverado, this is typically the passenger side.

While the truck may still drive, it's not recommended as it can lead to reduced performance, increased emissions, and potential damage to the catalytic converter over time.

Repair steps often include replacing the Bank 2 Sensor 1 oxygen sensor, checking for exhaust leaks, inspecting wiring and connectors, and ensuring the engine is running with the correct air-fuel balance.

You can use a multimeter to check the sensor’s resistance or a scan tool to monitor live data and confirm if the sensor switches properly between rich and lean conditions.

It's unlikely but possible. A restricted or damaged catalytic converter could cause abnormal oxygen sensor readings, though this is less common than sensor or wiring issues.

The cost varies, but replacing the oxygen sensor typically ranges from $150 to $300, including parts and labor. Additional repairs for wiring or exhaust leaks may increase the cost.

Regular maintenance, including inspecting oxygen sensors, addressing exhaust or vacuum leaks promptly, and ensuring proper engine tune-ups, can help prevent this code from returning.