Ford Taurus. Check Engine Light Code P1400 - 2002 Ford Taurus

P1400 Exhaust Gas Recirculation valve position sensor
P1401 Exhaust Gas Recirculation valve position sensor
P1402 Exhaust Gas Recirculation metering orifice restricted
P1403 Exhaust Gas Recirculation differential pressure sensor
P1404 EGR Temperature Sensor circuit
P1405 Exhaust Gas Recirculation Differential Pressure Feedback Sensor upstream hose off or plugged
P1406 Exhaust Gas Recirculation Differential Pressure Feedback Sensor downstream hose off or plugged
P1407 EGR solenoid -No Flow Detected
P1408 EGR solenoid -Flow out of Self- Test Range
P1409 EGR Vacuum Regulator solenoid circuit malfunction
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The sensor for the EGR Valve position is not functioning correctly.

P1400 Heated Catalyst Battery Voltage or Current too Low During Heating (Bank 1)

Many things will set this code.causeing low voltage to dpfe sensor,its alot of times bad,first test egr valve with applied vacum to determine its not bad.tube running to exhaust can and does clog with carbon over years.if its clogged must be cleaned.check dpfe sensor voltage rise and fall differences correct,before just chaung things.egv pressure regulator check also.check thouroughly all wiring,it can aand does get hot ,soften an stick together shorting ang ground as it should not,, make sure pvc valve working and not leaking vacum,all hoses and fittings should be checked for vacum leaak..even a faulty maf sensor that might not set aa code will brigabout this code 1400.thouroughly tesst all components even 02 sensors should be suspect.all this fails at about the same time.take your time ,overlook nothing fix everything right the first time.dont waste your money.most of these parts are available way less than dealership and even autozone on ebay