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Back with my '89 Toy truck the check engine light came on with no preformance issues. I talked to our fleet mechanic and he told me to pull out the air sensor and clean off the crap, reinstall, then disconect the battery to reset the computer. This is for exhaust sensors and a temp fix. It worked for about 15K miles then I would do it again. Try at your own risk I don't want to mess up your truck. Good luck
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