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P1158 Diagnostic Trouble Code Discussion for April 2007

Heated Oxygen Sensor (Bank 2 Sensor 2) Circuit High Voltage During Decel Fuel Cutoff

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Trouble Ticket Help Requests for DTC P1158
Help Request Posted
1997 Land Rover Discovery SD 4.0L Excessive Emissions, Poor Fuel Economy
P1158: mfr controlled fuel and air meter. hello techs! i have a land rover that failed an e-test. it failed on CO 4x the limit amount at 2500 rpm. car is running rich. O2 voltage is .920v steady, i ran the vehicle with a vac. leak, it made no changes. any ideas guys? thanks.
April 24, 2007