P0161 is a very common OBDII code that occurs in the Chevy Silverado. It is typically caused by a failure in one of the elements that heat the oxygen sensors, specifically bank 2 sensor 2. Replacing the Oxygen sensor will fix the problem a majority of the time. Some of the other causes of P0161.
The first step in diagnostics for a P0161 trouble code is to perform a visual inspection of the wiring for the bank 2 sensor 2 oxygen sensor. Many times this code will be set due to damaged wiring. This can be caused by either the wiring being routed incorrectly or by road hazards that caused damage to the wiring.
How to repair P0161 Mercedes-Benz code HO2S Heater Performance Bank 2 Sensor 2 The Powertrain Control Module (PCM) supplies a bias voltage (approximately 450 mV) on the Heated Oxygen Sensor (HO2S) signal high and low circuits.
Issue + Repair History: MIL light on. Code P0161 stored indicating oxygen sensor heater circuit failure. Uncertainty about which of the 4 O2 sensors had the faulty circuit. Replaced bank 2 sensor 2 (rear sensor, right side) but the light came back on. All 4 positions use the same part numbered O2 sensor.
The P0161 code only applies to cars with V6 or V8 engines. If your vehicle only has four cylinders, it will only have one bank and, typically, one downstream sensor, so it can't trigger this code. Instead, a faulty downstream heated oxygen sensor will be set as P0141 or Oxygen Sensor Heater Circuit Malfunction (Bank 1, Sensor 2) .
How to Diagnose and Fix the Cause of P0161 Code As the causes of a heater circuit issue are limited, the diagnosis process is fairly straightforward. You'll need simple tools, an OBD II scanner and a way to safely get under the car.
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