Mike's Workshop Manuals
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Jeep
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2021
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Grand Cherokee Laredo E, AWD, Automatic T/Case Control
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Repair and Diagnosis
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Engine Performance
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System
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3.6L - DTCS B1810 To P0072
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Diagnosis And Testing
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P0057-O2 Sensor 2/2 Heater Circuit Low
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When Monitored
When Monitored
Battery voltage between 10.5 and 15.75 volts.
The O2 Sensor Heater is commanded on.
The O2 Sensor Heater circuit high fault is not active.