Engine code p0401 solved. egr insufficient flow 2000 f150 xlt Egr p0401 insufficient f150 P0420 catalyst
FORD FIX CODE P0420 CATALYST SYSTEM EFFICIENCY ANY FORD - YouTube
P0401 f150 code 2000 egr engine flow insufficient xlt
Sensor o2 oxygen heater p0137 heated p0138 resistance ho2s carparts p0030 causes exhaust sensor1 bank2
P0138 code: o2 sensor circuit high voltage (bank 1, sensor 2) .
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