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What is your question?
I had my check engine light come on about two months ago, the part store diagnostic machine said replace o2 sensor,i have replaced the o2 sensor, new plugs, oil change, gas cap, coolant flush, air filter. check engine light has been off for a week, i have been thru inspection 9 times and been told to drive more, every time [ and received one traffic ticket, even after showing the failed inspection reports and parts receipts! ] This is my work truck, A 2.7 4 cyl Toyota prerunner. Any clues would be gladly appreciated. I have read your how to perform a basic drive cycle and will do that in the morning after church. Thanks.
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I don't know if this will help, but when my check engine light came on a few years ago I didn't want to spend the money on the O2 sensor. I disconnected the battery and let it sit overnight, then hooked the battery back up the next day and drove about 35 miles before my inspection. It was enough to register some data and it passed, the check engine light stayed off until about a week later - of course by then it didn't matter to me lol. The following year I tried again but the check engine light would come on after about 5 miles. Then I had to break down and buy the sensor.