Before I spend the money on these babies, can someone please tell me whether or not the O2 sensors are a DIY project or do I need to have a shop do it??? I need to do the spark plugs this weekend and if I can do the O2 sensors along with the plugs, I will save myself some labor charges.

Thanks in advance!!!

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2001 X5 3.0i (PP/WP/AP) Traded at 213K miles
RARE White on Black - Why does everyone get Tan??
First E53 with 215s on XOutpost!!