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Old 10-17-2009, 10:13 AM   #9
MarkD's Avatar
Join Date: Apr 2002
Location: In Your DME!
Posts: 2,404
Originally Posted by jasonlau8023 View Post
anybody know if i should replace both or 4 of o2 sensors?
i checked the price online, the price is killing me!!! around 160 each!!!
maybe i have to look for some used ones......
Don't buy used ones. And you only need to replace the after cat ones if the diagnostics indicate they are dead. I think you should go to a mechanic if you aren't familiar with cars.
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