What is p1128?

P1128 is a diagnostic trouble code (DTC) that typically indicates a problem with the fuel mixture being too rich or too lean, depending on the vehicle's make and model. It often suggests an issue with the fuel system, such as a malfunctioning oxygen sensor, fuel injectors, or an air intake leak. This code can lead to decreased fuel efficiency and increased emissions if not addressed. It's important to diagnose the underlying cause to ensure proper vehicle performance.