All four o2 sensor heater codes coming on - Ford Explorer Forum - Forums for Ford Explorer Enthusiasts
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Old 02-03-2019, 05:05 PM   #1
Csnell
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All four o2 sensor heater codes coming on

Surly all four cant go bad at once ?

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Old 09-19-2019, 06:44 AM   #2
rhoptry
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All four O2 heater codes here too. 2006 explorer 4.0.
Suspecting PCM.
EVAP purge is on same fuse, but works.
suggestions?
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Old 09-27-2019, 11:16 AM   #3
J_C
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I would wonder if you are burning oil and this is fouling them. Otherwise, I would check the electrical connections at the two big connectors under the hood towards the top and rear of the engine bay, unplugging, inspecting, and replugging them in.

If all that seems fine, I might buy ONE O2 sensor and replace it to see if that clears one of the codes, before investing the time and money to do all 4. I'd do one of the upstream first since they take more abuse than downstream.
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