P0162 - O2 Sensor Circuit Malfunction (Bank 2, Sensor 3)
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System
Powertrain (Engine & Gearbox)
Related Fault Codes
Technical Description
P0162 is a generic OBD-II diagnostic trouble code (DTC) indicating a malfunction in the O2 sensor circuit for Bank 2, Sensor 3. The Engine Control Module (ECM) monitors the voltage signal from the oxygen sensor to ensure it stays within the expected operating range (typically 100mV to 900mV). If the ECM detects an open circuit, high resistance, or an implausible voltage signal from this specific sensor, P0162 is stored. This sensor is crucial for monitoring catalyst efficiency downstream of the catalytic converter.
Possible Causes
Defective oxygen sensor (internal short or open circuit)
Damaged wiring harness (chafed against exhaust or chassis)
Corrosion or poor connection in the sensor connector
Faulty Engine Control Module (ECM) or software error
Symptoms
Recommended Solution
Workflow
Mechanic's Tip
Before replacing expensive components, always double-check wiring and connections. 80% of all sensor faults are actually due to corroded contacts or broken wires.
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