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I just had the same problem myself on my 97 stick shift RAV4. I decided to invest in a OBDII scanner ($68 at Walmart, but you see them for half that on eBay). The code was P0130, oxygen sensor circuit problem. It was really cold here in PA when the light came on, so I wondered if the fault was triggered by that. So I used the "erase" function on the scanner to turn off the light and see what happened. So far (about ten or so engine cycles), the check engine light has not come on again. I'm not at all sure the problem is fixed (but I know where to look if it comes back), but I think the scanner was a good investment (equal to one hour of labor at the shop!) that I can use on my other cars as well as the RAV.
I'd be interested if anyone has any experience with this issue?
Ray
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