Glad theres is a thread about o2 sensors, but my question is just a bit different. I am in the process of replacing all 3 sensors on my '99 SE (92K). I bought the Walker universal sensors from oxygensensors.com and they shipped very fast, I used the Maxima.org discount as well. My mechanic says that I shouldn't use the universal sensors because they are not a direct fitament, he says that even though you do the splicing sometimes universal sensors just fail to work properly and you end us replacing them. Has anyone replaced their sensors with universal types and had any problems or particurally with the Walker brand sensors? Thanks in advance for any and all responses.....