help 99 ranger 02 sensors

dham99 · 05-14-2011, 10:01 AM

99 ranger how many 02 sensors does a 3.0 flex fuel have/ and thier locations....Thanks for your help. frustrated with engine lights

rwenzing · 05-14-2011, 03:18 PM

There are 2 upstream of all cats (1 for each cylinder bank for mixture control) and 1 more downstream (for the cat efficiency monitor). Each trouble code number will tell you which sensor is being flagged and why.

dham99 · 05-14-2011, 03:27 PM

Thanls for the info... Is there diagram that would show where located on bank sides. agaon thx

rwenzing · 05-14-2011, 06:09 PM

The 2 upstream O2's will either be near the outlets of the exhaust manifolds or in the exhaust pipes just downstream of there - always before entering any cats.

The single cat efficiency O2 sensor will definitely be after the y-pipe joins into one pipe. The one I've seen is in between the two large underbody cats, probably on top where it's a little harder to see.

It is easy to find the sensors by looking for the 4-wire pigtail on each. Usually 2 white wires plus a grey and a black.

dham99 · 05-15-2011, 09:55 AM

thx i will give it shot..

05-14-2011, 10:01 AM	#1
dham99 Wannabe Elite Explorer St. Paul Mn. 99 ranger XLT super cab Join Date: Sep 2010 Posts: 10 Vehicle Specs (Original Poster)	help 99 ranger 02 sensors 99 ranger how many 02 sensors does a 3.0 flex fuel have/ and thier locations....Thanks for your help. frustrated with engine lights

05-14-2011, 03:18 PM	#2
rwenzing Wannabe Elite Explorer Michigan 03 Ranger FX4 LII 5.0 S/C Join Date: Nov 2005 Posts: 964 Vehicle Specs	There are 2 upstream of all cats (1 for each cylinder bank for mixture control) and 1 more downstream (for the cat efficiency monitor). Each trouble code number will tell you which sensor is being flagged and why. __________________ Bob 2003 Ranger FX4 Level II, 5.0L V8, 4R70W, BW4406 T/C, Aussie Locker front, Torsen rear Torque Monsters, Magnaflow, duals; Explorer EATC, steering wheel controls, consoles Bilstein 7100 reservoir shocks, Cadillac/Mustang SVO rear discs, Duff traction bars CarDomain Ford owners' manuals ONLINE, then click on "Glovebox"

05-14-2011, 03:27 PM	#3
dham99 Wannabe Elite Explorer St. Paul Mn. 99 ranger XLT super cab Join Date: Sep 2010 Posts: 10 Vehicle Specs (Original Poster)	02 sensors and location Thanls for the info... Is there diagram that would show where located on bank sides. agaon thx

05-14-2011, 06:09 PM	#4
rwenzing Wannabe Elite Explorer Michigan 03 Ranger FX4 LII 5.0 S/C Join Date: Nov 2005 Posts: 964 Vehicle Specs	The 2 upstream O2's will either be near the outlets of the exhaust manifolds or in the exhaust pipes just downstream of there - always before entering any cats. The single cat efficiency O2 sensor will definitely be after the y-pipe joins into one pipe. The one I've seen is in between the two large underbody cats, probably on top where it's a little harder to see. It is easy to find the sensors by looking for the 4-wire pigtail on each. Usually 2 white wires plus a grey and a black. __________________ Bob 2003 Ranger FX4 Level II, 5.0L V8, 4R70W, BW4406 T/C, Aussie Locker front, Torsen rear Torque Monsters, Magnaflow, duals; Explorer EATC, steering wheel controls, consoles Bilstein 7100 reservoir shocks, Cadillac/Mustang SVO rear discs, Duff traction bars CarDomain Ford owners' manuals ONLINE, then click on "Glovebox"

05-15-2011, 09:55 AM	#5
dham99 Wannabe Elite Explorer St. Paul Mn. 99 ranger XLT super cab Join Date: Sep 2010 Posts: 10 Vehicle Specs (Original Poster)	02 sensors and location thx i will give it shot..