Diagnostic Trouble Code
P0161
Oxygen O2 Sensor Circuit Low B2S2
Technical Description P0161
Oxygen O2 Sensor Circuit Low Voltage (Bank 2, Sensor 2)
What Does This Mean P0161?
This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles. Although generic, the specific repair steps may vary depending on make/model.
It basically means the PCM detected either an excessive current draw, or an open or short in the circuit powering the oxygen sensor's heater circuit. This is in reference to the Heated Oxygen Sensor (2) located rear of catalytic converter (Bank 2).
It basically means the PCM detected either an excessive current draw, or an open or short in the circuit powering the oxygen sensor's heater circuit. This is in reference to the Heated Oxygen Sensor (2) located rear of catalytic converter (Bank 2).
Possible Causes P0161
1
HO2S heater power circuit open
2
HO2S heater ground circuit open
3
HO2S signal tracking (due to oil or moisture in the connector)
4
HO2S is damaged or has failed PCM has failed
Solutions & Repair Steps P0161
• Replace HO2 Sensor
• Repair open or short in power circuit
• Repair open or short in ground circuit
• Repair damaged connector due to tracking
• Repair open or short in power circuit
• Repair open or short in ground circuit
• Repair damaged connector due to tracking