P0153 O2 Sensor Problem 97 Explorer XLT, V8

[KINNEY201]

1997 Ford Explorer, XLT, V8

Hi,
My CEL produced "O2 Sensor CKT Slow Response (Bank 2 Sensor 1). Could someone please help me pinpoint exactly where this sensor is and give me tips on replacing it? Thanks in advance. Also, how do I know which are "upstream" and which are "downstream"?

 

[reserved50]

probably means O2 sensor is worn
bank 1 are cylinder 1-4 on passenger side
bank 2 are driver side 5-8
upstream is the O2 closest to the engine

so bank 2 would be drivers side front if its sensor 1 upstream, I think you can access that easily, the other ones you have to remove the center console

http://www.explorerforum.com/forums//showthread.php?t=210218

 

[KINNEY201]

If I slide under the truck, right by the driver's side front tire I can access one of the sensors easily. Is it this one, or do I have to go through the console. I would like to know for sure before taking it apart. Thanks.

 

[reserved50]

if i rememeber its the first one on the drivers side, and the connector is on the left side of the transmission, you can reach the connector from under or thru the left front wheel well maybe. Its one of the easier ones to replace though.