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P1271 Diagnostic Trouble Code Discussion for September 2008

Air Fuel Sensor (Bank 1 Sensor 1) Circuit No Activity

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Trouble Ticket Help Requests for DTC P1271
Help Request Posted
2001 Ford F-250 Super Duty Lariat 7.3L Misfire VIN: 1FTNX21F21
P1271: Cylinder 1 - High To Low Side Open Detected. Retrieved codes P1271 and P1275. Engine is definately misfiring. I followed pinpoint tests and have come down to IDM fault. I checked connector at valve cover and is little melted at glow plug terminal but checked resistance on circuit 555 and 559 to circuit 1...
September 08, 2008