2003 Ford Focus 02 sensor stuck on lean

Tiny
RANDY SHARP
  • MEMBER
  • 2003 FORD FOCUS
  • 2.3L
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 80,000 MILES
Have a dtc 2274 02 sensor bank 1 sensor 3 stuck on lean. The motor really cuts out when you turn on ac or the defrosters I understand when you turn on defrosters the ac takes the humidity out of air. I have had this problem for awhile now. It still cuts out at other times but not nearly as bad, I thought when you turn on the ac isn't something suppose to step the idle up like the idle control valve. And the other funny thing about this zx3 focus 2.3 Litre motor there is no place to hook up a fuel pressure gauge no place I have looked believe me. So is there something that suppose to step RPM's up when you turn on AC or Defrost Cycle.
Wednesday, October 7th, 2015 AT 5:27 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 44,384 POSTS
Hey Randy,

The lean code is telling us the engine has a vacuum leak or a bad injector/misfire can you inspect the air intake boot for tears, vacuum hose broken, next, pull out all spark plugs to compare their condition, ( White/grey/black) this will help pin point the cylinder.

Please let me know what you find

Best. Ken
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Monday, October 12th, 2015 AT 2:49 PM

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