I am a new subscriber and fairly new to the internet. I need some help troubleshooting a problem with my 94 Ford Ranger. I have been getting an intermitent check engine light recently. When I retrived the codes it came up with 181 and 189. O2 sensor faults. The sensors had 60000 miles on them so I changed them. I'm still getting the same codes. The Chilton book says that this is a rich problem on both sides. What direction should I go in now?