The P0161 is a generic trouble code that translates to "O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 2)." Since the code has a '0' as the second digit, this means it's a generic or universal code. And it indicates the same issue on any car with an OBD-2 system regardless of make and model. 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. Jak mechanik może zdiagnozować kod P0161? Pierwszym krokiem w diagnozowaniu kodu usterki P0161 jest wizualne sprawdzenie okablowania czujnika tlenu w banku 2. W wielu przypadkach kod ten może być ustawiony z powodu uszkodzonego okablowania spowodowanego nieprawidłowym poprowadzeniem lub zagrożeniami na drodze. What Does the P0161 BMW Code Mean? The heated oxygen sensor 2 (HO2S), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. For optimum catalyst operation, the air fuel mixture (air-fuel ratio) must be maintained near the ideal stoichiometric ratio. Most cases can be solved simply by replacing the oxygen sensor. The oxygen sensor is located in bank 2 of your engine. When the sensor is faulty, it can interfere with the fuel/air mixture. The first thing to do if you notice this code is to take it to a repair shop. This may cost $75 to $150. 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. =====Claim your FREE engine code eraser 👉 👈=====Engine Code HONDA P0161 Saving Repai 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. Follow these steps to fix the P0161 error: Connect the OBD-2 scanner. Check for the displayed error codes. Diagnose the reason for the error without causing a failure in the downstream oxygen sensor system. See if the problem is with the power relay of the sensor or the wiring. Splicing the rDY3UF.