I think it's time for new O2 sensors

[Brockmeister]

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?

[Burg Boxster]

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

[Topless]

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