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To be sure you should have the codes pulled; If I were to guess, I would say your Oxygen sensor sensor is faulty causing the light to come on. Once you slow down, it is able to calibrate again. I hope this helps you. Mark

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โˆ™ 2005-11-29 01:57:53
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Q: Why does service engine light come on a 1994 Mazda B4000 after driving on freeway for 20-30 minutes Never happens driving around town Any ideas?
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