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If i were a betting man, i'd say that your O2's are on their way out. If it were a "hard" fault (bad egr solenoid) your light would be blazing. If your car has more than 50,000 i'd replace the O2 sensors. Does you car seem to be using more gas, lately?
OBD II was first introduced (if i remember correctly) in 1995. The code scanner you'll need from Autozone is the expensice one. Wouldn't you know it. The cheapie $30 will not work.
If you pm me, i'll shoot you the testing procedures for the O2, as i don't have them here in front of me.
Hope this helps
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