O2 sensors

1993 CADILLAC DEVILLE
150,000 MILES • V8 • FWD • AUTOMATIC
Avatar
DOWNWIND
  • MEMBER
  • 4 POSTS
How many O2 sensors are on a 1993 Cadillac DeVille 4.9?
Apr 26, 2011 at 7:22 PM
Advertisement
Avatar
DOCFIXIT
  • CERTIFIED EXPERT
  • 18,828 POSTS
1
Apr 26, 2011 at 7:27 PM
Avatar
DOWNWIND
  • MEMBER
  • 4 POSTS
Thank you. I'm getting conflicting info, including info from the diagnostic circuits from the vehicle, which indicate there may be as many as 3 O2 sensors. The main complaint on the vehicle is very poor gas mileage (14 mpg on the highway). Thanks again.
Image (Click to enlarge)
Attached Media
Apr 26, 2011 at 7:44 PM
Advertisement
Avatar
DOCFIXIT
  • CERTIFIED EXPERT
  • 18,828 POSTS
Getting code E44 or E45?
Apr 26, 2011 at 7:55 PM
Avatar
DOWNWIND
  • MEMBER
  • 4 POSTS
E44, which says that the right O2 sensor is lean.
Nothing on E45.
Apr 26, 2011 at 8:21 PM
Avatar
DOCFIXIT
  • CERTIFIED EXPERT
  • 18,828 POSTS
Need DVOM follow tests in flow chart see diagrams
Images (Click to enlarge)
Attached Media
Attached Media
Apr 27, 2011 at 3:47 PM