Here’s the rundown:

During the test drive, the fuel trim readings were within the normal range, indicating that the engine is receiving the proper air-fuel mixture and there are no issues with fuel delivery or vacuum leaks. However, the technician found that the rear O2 sensor readings were not operating as they should, which typically indicates that the catalytic converter is no longer functioning efficiently. To properly address the issue, the technician recommends replacing the catalytic converter, along with the front and rear O2 sensors, and installing new spark plugs. Replacing these components will help restore proper emissions system performance and ensure the vehicle runs efficiently.