It has about 180k miles on it. i read somewhere else about the o2 sensors that i used to replace the old ones not being OEM. It said that they went back to OEM sensors and the codes went away. I think i will try this today and see. We did a tuneup about 40k miles ago. During that tuneup, we replaced all plugs and boots. It was running great, even when the o2 sensor code came up. I thought we were being proactive with replacing both upstream sensors, instead of just the one that was faulted.
Thank you for your response.