p1168 closed loop control function bank 2

P1168 Closed Loop Control Function Bank 2

OBD2 Code: P1168

Description: Closed Loop Control Function Bank 2

Definition: This code indicates that the engine control module (ECM) has detected a problem with the closed loop fuel control function for bank 2. The ECM is unable to maintain the desired air-fuel ratio due to an issue in the feedback from the oxygen sensor or other related components.

P1168 Description: Closed loop control function for bank 2 does not operate.

Typical Severity: Moderate

Common Causes

Description: Closed loop control function for bank 2 does not operate even when the vehicle is driving in the specified condition.

Common Causes:

Common Misdiagnosis

OBD2 Code: P1168

Description: Closed Loop Control Function Bank 2

Common Misdiagnosis: Replacing the oxygen sensor without checking for vacuum leaks or exhaust leaks that could affect the sensor readings.

Common Diagnostic Steps

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OBD2 Code: P1168

Description: Closed Loop Control Function Bank 2

Check for any additional trouble codes that may be present, as they can provide more context or indicate related issues.
Inspect the oxygen sensor on bank 2 for proper operation. This includes checking the wiring and connectors for damage or corrosion.
Verify that the fuel pressure is within specifications, as incorrect fuel pressure can affect closed loop control.
Examine the exhaust system for leaks before the oxygen sensor, which could cause false readings and improper adjustments by the ECU.
Test the mass air flow (MAF) sensor to ensure it is providing accurate data to the engine control unit (ECU).
Check for vacuum leaks in the intake manifold or associated hoses, as these can lead to incorrect air-fuel mixture calculations.
If applicable, inspect and test any related sensors such as temperature sensors that might influence closed loop operation.
Consider updating or reprogramming the ECU if a software issue is suspected based on technical service bulletins (TSBs).