I'm currently contemplating preventative maintenance on my O2 Sensors. I'm only going to do the pre-cat's at this upcoming DIY, followed by the post-cat's at the next event. I'm just trying to figure out if its best to change out the pre-cat's or the post-cat's for the best bang for the buck. I'm having no trouble from either pre or post cat's at this time. I'm just nearing 277,000 and the O2 sensors are next on my list of tasks to complete prior to 300,000 miles. Thanks for your input. Happy Motoring...
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