P0157 2016 Chevrolet Silverado Code - HO2S Circuit Low Voltage Bank 2 Sensor 2

P0157 indicates that the oxygen sensor in Bank 2 Sensor 2 is reporting consistently low voltage, suggesting it may not be functioning properly or detecting a lean exhaust condition.

Symptoms may include reduced fuel efficiency, poor engine performance, the check engine light illuminated, and potentially excessive emissions.

Common causes include a faulty oxygen sensor, damaged wiring or connectors, exhaust leaks near the sensor, or issues with the engine control module (ECM).

Bank 2 refers to the side of the engine opposite the number one cylinder, and Sensor 2 is the downstream oxygen sensor located after the catalytic converter.

Yes, a degraded catalytic converter can affect exhaust flow and oxygen readings, potentially leading to this code.

Begin by inspecting the wiring and connectors for damage or corrosion. If no issues are found, replace the oxygen sensor and clear the code. If the code persists, further diagnosis may be needed.

Driving with this code for a short period is unlikely to cause immediate damage, but prolonged driving can lead to increased emissions and reduced performance, potentially harming the catalytic converter.

Repair costs vary, but replacing the oxygen sensor typically costs $150–$300, including parts and labor. Wiring repairs or catalytic converter replacement may cost more.

You'll need an OBDII scanner, a multimeter for testing wiring, and basic hand tools for replacing the oxygen sensor.

A dirty air filter can affect air-fuel ratios, but it is unlikely to directly cause this code. However, it’s always a good idea to check and replace the air filter if needed during diagnosis.