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International Automotive Technicians Network
Re: 99 Mountianer/Explorer OBD II Trouble Codes...Help.....!!!
Posted to Technical Discussion Forum on 1/20/2003

dtc 1127 definitions courtesy alldata

P1127 EXHAUST NOT WARM ENOUGH, DOWNSTREAM SENSOR NOT TESTED

"The HEGO monitor uses an exhaust temperature model to determine when the HO2S heaters are cycled on. The test fails when the INFERRRED EXHAUST TEMPERATURE is... Login to read more.