02 sensor help

[justinhill]

I went to go get my check engine light read and came up that all three of my 02 sensor are not reading and that the truck is running lean. any in put what could cause my 02 sensor to not be reading? truck is running strong but is runninh lean. every thing is pluged in and this is for a 1999 ranger with the 4.0

 

[modelageek]

I went to go get my check engine light read and came up that all three of my 02 sensor are not reading and that the truck is running lean. any in put what could cause my 02 sensor to not be reading? truck is running strong but is runninh lean. every thing is pluged in and this is for a 1999 ranger with the 4.0

welcome to the forum.........you will save a lot of time if you go look up the actual codes and post what they are. The actual #'s........trust me........

 

[Earl43P]

Well, they all three share the same heater circuit power from fuse #13 under the hood (15A).

They also share the same signal return path to the PCM, O2 OG wire ties to GY/RD and into the PCM. That should be good since that same return path is shared with CMP and CKP.

I would suggest thoroughly inspecting the wiring to each O2. Might find a wire shorted to the exhaust or something, affecting all 3.