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hey all, ive had an issue with getting my engine light to stay off. i know what the problem is i just dont know how to fix it without putting the old exhaust back on, (which by now would not be a good idea since its been raining and snow got in it too.) I have an aftermarket exhaust on my 09 lancer gts, and my downstream o2 sensor keeps throwing the code. is there a way to tune the o2 sensor so it doesn't trip, or am i just gonna have to deal? i haven't tried putting an adapter on the downstream yet since i have one on the upstream, but i went to a mitsubishi dealer and they said try tuning. all suggestions are welcome
 
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