I think it's time for new O2 sensors
 

Hi Folks. I've been getting codes P0134 and P00154 lately. I clear them and eventually they come back. I guess after 87k in the clock, it may be time to replace the pre cat sensors. Can anything else cause the codes?

yep... lots of things can cause the codes. It's extremely rare for more than one O2 to go at a time (unless there is another underlying issue). A fault code for O2s only means the value they are reporting to ECU are outside of norm. Test the O2s individually using using a multi-meter to see if they are really bad...

Good luck :)

P0134/P0154 sound like broken connection or failed DME, not aging O2 sensors. Possibly a rodent damaged the wiring at a bulkhead.