how to fix code p1133 and p1153

Error codes P1133 and P1153 are related to the oxygen (O2) sensors in your vehicle’s exhaust system. These codes indicate a problem with the O2 sensors on bank 1, which is typically the side of the engine where cylinder 1 is located. Here’s how to diagnose and potentially fix these codes:

1. Check for Vacuum Leaks:

  • Vacuum leaks in the intake system can affect the O2 sensor readings. Inspect the intake hoses, vacuum lines, and gaskets for any cracks, leaks, or loose connections.

2. Inspect the O2 Sensors:

  • Check the condition of the upstream (pre-catalytic converter) and downstream (post-catalytic converter) O2 sensors on bank 1. Replace any sensors that are damaged, have loose connections, or are malfunctioning.

3. Clean or Replace Mass Airflow Sensor (MAF):

  • A faulty MAF sensor can impact the air-fuel mixture and trigger these codes. Clean the MAF sensor using specialized MAF cleaner or consider replacing it if cleaning doesn’t resolve the issue.

4. Check for Exhaust Leaks:

  • Exhaust leaks before or after the O2 sensors can affect their readings. Inspect the exhaust system for leaks, including the exhaust manifold, pipes, and the connection points to the catalytic converter.

5. Inspect the Catalytic Converter:

  • A failing or clogged catalytic converter can trigger these codes. Perform a visual inspection for any physical damage or blockages in the catalytic converter. Replace it if necessary.

6. Check Fuel System:

  • Ensure that the fuel system is functioning correctly. Check fuel pressure, fuel injectors, and the fuel filter for any issues that could affect the air-fuel mixture.

7. Reset the Codes:

  • After performing any necessary repairs or inspections, reset the error codes using an OBD-II scanner. Some codes may clear on their own after the issue is resolved.

8. Monitor for Code Recurrence:

  • Drive the vehicle and monitor for the recurrence of error codes P1133 and P1153. If they reappear, further diagnosis may be required to pinpoint the exact issue.

9. Seek Professional Help:

  • If you are unable to diagnose or fix the problem yourself, or if the codes keep returning, it’s advisable to consult a professional mechanic or a dealership service center. They can use more advanced diagnostic tools and techniques to identify and resolve the issue.

Keep in mind that diagnosing and fixing OBD-II error codes can sometimes be complex, and it may require specialized equipment. It’s important to address these codes promptly to prevent potential damage to your vehicle’s engine or emissions system.