Fuel too rich
Ford E-250 1997 5.4 engine 288000 miles
O2 sensor related I'd bet.
Lack of O2 sensor switch, rich; lean;
Upstream O2 circuit fault
Downstream circuit fault
I've replaced all the sensors, tried the extenders and still the same problem.
Lack of O2 sensor switch, rich; lean;
Upstream O2 circuit fault
Downstream circuit fault
I've replaced all the sensors, tried the extenders and still the same problem.
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