What is the code P1132 for 1997 Ford Expedition?

The code P1132 for a 1997 Ford Expedition indicates a problem with the air-fuel mixture, specifically relating to the oxygen sensor readings. It typically means that the engine control module (ECM) is detecting a lean condition, where there may be too much air or not enough fuel in the combustion chamber. This could be caused by issues such as a vacuum leak, faulty fuel injectors, or a malfunctioning mass airflow sensor. Addressing this code often involves inspecting the fuel system and related components to ensure proper operation.