Diagnosing Rich Engine DTCs
Rich fuel system DTCs are less common than lean DTCs but can be more difficult to diagnose. The problem is that they can be caused by many things including fuel delivery, fuel control, and engine mechanical problems.
- Learn methods that can quickly identify the source of the problem
- Leverage scan data to improve diagnostic speed
- Learn to tell when is “really” rich or if there is a fault in the control system
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