P1158 – Ford DTC

Ford DTC P1158 – Lack of Downstream Heated Oxygen Sensor Switch – Sensor Indicates Rich – Bank No. 2

DTC P1158 meaning on Ford

1. DTC: P1158
2. Definition: Lack of Downstream Heated Oxygen Sensor Switch – Sensor Indicates Rich – Bank No. 2
3. Meaning: The downstream oxygen sensor in Bank 2 is indicating a rich air-fuel mixture for an extended period, which can lead to increased emissions and potential engine performance issues.

Ford DTC P1158 symptoms

• Check Engine Light (MIL) illuminated
• Decreased fuel efficiency
• Rough idling or engine misfires
• Increased emissions

Ford DTC P1158 causes

• Faulty downstream oxygen sensor
• Vacuum leaks in the intake system
• Fuel pressure regulator issues
• Exhaust system leaks
• Engine misfires

Ford DTC P1158 seriousness

1. Severity: Moderate
2. Driving with this DTC may lead to increased emissions and potential engine performance issues.
3. It is recommended to address this issue promptly to prevent further damage to the vehicle.

How to diagnose DTC P1158 on Ford

• Use an OBD-II scanner to retrieve the DTC codes and freeze frame data
• Inspect the downstream oxygen sensor in Bank 2 for any signs of damage or contamination
• Check for vacuum leaks in the intake system
• Test the fuel pressure regulator for proper operation
• Inspect the exhaust system for leaks

How to fix DTC P1158 on Ford

• Replace the downstream oxygen sensor in Bank 2 if faulty
• Repair any vacuum leaks in the intake system
• Replace the fuel pressure regulator if necessary
• Fix any exhaust system leaks
• Address any engine misfires

How to erase DTC P1158 on Ford

1. Use an OBD-II scanner to clear the DTC codes
2. Ensure the underlying issue causing the DTC has been resolved
3. Perform a test drive to verify the repair and ensure the DTC does not return