2000 Ford Taurus O2 sensors not heating at idle

2000 FORD TAURUS
120,000 MILES • 6 CYL • FWD • AUTOMATIC
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MBCT
  • MEMBER
  • 1 POST
all four O2 sensors are not heating up at idle. watching them with scan tool the voltage on all four goes very low, engine fuel control switches to open loop. what controls the heating of the o2 sensors? fuse, relay, pcm?
Nov 16, 2009 at 8:23 AM
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BMRFIXIT
  • ✓Experienced Mechanic
  • 19,053 POSTS
When engine 1st start battery volts supplied to the O2 sensors heater
check fuses and relays
Nov 16, 2009 at 12:33 PM
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