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Freeze Frame Diagnostics

Tomorrow's Technician

This standardized many of the onboard emissions protocols and codes and allowed states to perform onboard emissions testing. As time passed, even large trucks and motorcycles adopted this same method to test the emissions status of a vehicle. These PIDs focus on the how the engine burns fuel and manages emissions.

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P0157 Code – Oxygen Sensor Circuit Low Voltage Guide

RepairSmith

Definition of Diagnostic Trouble Code (DTC) P0157 Diagnostic Trouble Code (DTC) P0157 stands for “Oxygen Sensor Circuit Low Voltage (Bank 2, Sensor 2).” ” This code appears when the downstream oxygen sensor on Bank 2 shows a low voltage signal for too long.