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2003
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XJ8 Base
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Repair and Diagnosis (Single Page)
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Engine Controls - Self-Diagnostics
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Diagnostic Trouble Code Identification
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DTC P0031: Ho2S Heater Control Circuit Low Current (Bank 1, Upstream 1)
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Possible Causes
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Possible Causes
HO2S heater power supply circuit open.
HO2S heater control circuit open or high resistance.
HO2S heater failure.