P0165 O2 Sensor Circuit Slow Response Bank 2 Sensor 3

Definition: The P0165 code indicates that the oxygen sensor circuit for bank 2, sensor 3 is responding slower than expected. This means the sensor is not switching between rich and lean conditions as quickly as it should.

p0165: O2 Sensor Circuit Slow Response Bank 2 Sensor 3

Typical Severity: Moderate

Common Causes

P0165 – O2 Sensor Circuit Slow Response Bank 2 Sensor 3

Common Causes:

• Faulty oxygen sensor
• Wiring or connector issues in the oxygen sensor circuit
• Exhaust leaks near the oxygen sensor
• Engine running too rich or too lean
• Faulty engine control module (ECM)

 

Common Misdiagnosis

OBD2 Code: P0165

Description: O2 Sensor Circuit Slow Response Bank 2 Sensor 3

Common Misdiagnosis: Replacing the oxygen sensor without checking for exhaust leaks, wiring issues, or a faulty catalytic converter that could affect sensor performance.

 

Common Diagnostic Steps

OBD2 Code: P0165

Description: O2 Sensor Circuit Slow Response Bank 2 Sensor 3

Common Diagnostic Steps:

• Verify the code with an OBD-II scanner and clear it to see if it returns.
• Inspect the wiring and connectors for damage or corrosion at Bank 2 Sensor 3.
• Check for exhaust leaks near the sensor that could affect its readings.
• Test the oxygen sensor’s response time using a multimeter or oscilloscope.
• Examine the fuel system for issues such as incorrect fuel pressure or injector problems.
• Ensure there are no vacuum leaks that could impact engine performance.
• If necessary, replace the oxygen sensor with a new one and retest to confirm resolution.