DTC P0157 Acura
Front Secondary HO2S (Bank 2, Sensor 2) Circuit Low Voltage
Front Secondary HO2S (Bank 2, Sensor 2) Circuit Low Voltage
Description
The execution time is continuous and the duration time is 40 seconds or more. The system is in closed loop with the engine coolant temperature at 156 ºF (69 ºC) and the intake air temperature at -13 ºF (-25 ºC). The rear secondary HO2S output voltage is 0.05 V or less for at least 40 seconds. After current is applied to the rear secondary HO2S heater, if the rear secondary HO2S output continues low (lean) during feedback control, a malfunction is detected and a DTC is stored. NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot.
Cause and Solution
Poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM
Open or Short circuit between the PCM and the secondary HO2S (Sensor 2)
Faulty secondary HO2S (Sensor 2)
Video Guide
Diagnostic Info
- DTC Code: P0157
- Brand: Acura