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P1187 Diagnostic Trouble Code Discussion for September 2014

Fuel Tank Temperature Sensor Circuit Low Voltage


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Trouble Ticket Help Requests for DTC P1187
Help Request Posted
1997 Land Rover Discovery SD 4.0L Excessive Emissions, Poor Fuel Economy VIN: SALJY124XV
P1187: HO2S one heater open circuit. Stumped as to why both upstream and down stream O2's are stuck at 5.00v. Run engine up to 2500 rpm with no change in sensor voltage or short term fuel trim. Have applied shotgun approach to parts/diagnosis: fit 1 new upstream O2, mass air flow, engine ecu, coo...
September 23, 2014
1997 Land Rover Discovery SD 4.0L Excessive Emissions, Poor Fuel Economy VIN: SALJY124XV
P1187: HO2S one heater open circuit. Stumped as to why both upstream and down stream O2's are stuck at 5.00v. Run engine up to 2500 rpm with no change in sensor voltage or short term fuel trim. Have applied shotgun approach to parts/diagnosis: fit 1 new upstream O2, mass air flow, engine ecu, coo...
September 24, 2014