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Lean codes and another rear 02 sensor issue
I also have a problem understanding these lean codes and the activity on the rear 02 sensors. This Expedition has 2 codes (both banks lean) set. When monitoring the rear 02 sensors with engine at normal operating temperature, the rear 02 sensors seem to be stu... Login to read more. 
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| Engine | 5.4 L |
| Trans | 4-speed Automatic (Electronic) |
Vehicle Data
2001 Ford Expedition XLT 5.4L
| Engine | 5.4 L |
| Trans | 4-speed Automatic (Electronic) |
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