P0161 Fault Code

O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 2)

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0161 fault code refers to a malfunction in the oxygen (O2) sensor heater circuit for Bank 2 Sensor 2. This sensor plays a crucial role in monitoring the exhaust gases and ensuring optimal fuel efficiency and emissions control. When the engine control unit (ECU) detects a problem with the heater circuit, it triggers this fault code, which can lead to various performance issues.

What are the symptoms of the P0161 code?

• Decreased fuel efficiency
• Rough idling or poor engine performance
• Increased emissions leading to possible failure in emissions testing
• Check Engine Light (CEL) illuminated on the dashboard

What causes the P0161 code?

• Faulty O2 sensor heater element
• Wiring issues or damaged connectors in the heater circuit
• Blown fuse related to the O2 sensor heater
• ECU malfunction or programming errors

How to fix P0161?

• Inspect and repair any damaged wiring or connectors in the O2 sensor heater circuit.
• Replace the faulty O2 sensor if the heater element is defective.
• Check and replace the blown fuse if applicable.
• Clear the trouble codes and perform a test drive to ensure the issue is resolved.