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O2 Sensor Heater Problem

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Old 05-08-2003, 12:40 PM
hl649 hl649 is offline
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O2 Sensor Heater Problem

I have a 1996 F150 with a 4.9 I6. It keeps throwing a code for the O2 sensor heaters. I have changed all 3 of the sensors out and reset the CEL but it keeps coming back. Does anyone have any ideas what may be causing this?

HL
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Old 05-09-2003, 09:57 AM
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thelonerangerxlt thelonerangerxlt is offline
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O2 Sensor Heater Problem

HL, if you have the four wire sensors, one of the wires is for the heater ground circuit. On most Fords, it will terminate to a bolt somewhere on the rear of the engine. Maybe you have a bad ground where it terminates? I think the ground wire is yellow (maybe with a stripe), but I'm not absolutely sure.....
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