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Originally Posted by 2000SoCalBoxsterS
But my question is, why does the actual code definition say it involves my O2 sensors? Should I replace all four of my O2 sensors? I hear they are about $130 a piece.
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The O2 sensors are just reporting the symptoms of the problem. Since they are the last sensor, there is so much upstream that could result in a O2 code. Cleaning the MAF may work, but if it doesn't, look for vacuum leaks. A vacuum leak could cause a rich condition. In addition to checking the usual tubing around the motor, check the oil cap, oil filler tube and oil dip stick. If that doesn't work, get a new MAF. Keep in mind there are 2 versions. It could be the air/oil separator, too. It's doubtful both O2 sensors went bad at the same time, but stranger things have happened--I recently replaced my O2 sensors and one replacement was bad from day 1 and it took forever to figure that out. Or take it to a shop and have them diagnose. These kinds of problems can take a ton of time to figure out without the proper diagnostic tools.