DTC P0161 Acura
Front Secondary HO2S (Bank 2, Sensor 2) Heater Circuit Malfunction
Front Secondary HO2S (Bank 2, Sensor 2) Heater Circuit Malfunction
Description
The front secondary HO2S heater output is 0.38 A or less, or 3.33 A or more, for at least 5 seconds when the heater is on. Engine running the battery voltage (IGP terminal of PCM) is 10.5-16 V, DTCs P0117, P0118 are not active. If the front secondary HO2S heater draws more or less than a specified amperage, the PCM detects a malfunction 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 front secondary HO2S (Sensor 2), the relay and the PCM
Open or Short circuit between the PCM and the front secondary HO2S (Sensor 2)
Video Guide
Diagnostic Info
- DTC Code: P0161
- Brand: Acura