2003 Hyundai tibouron check engine light is on and report says b1s1 but I just replaced it last week u can see on the computer that is is working but the check engine light comes back on
I had something similar but my airbag light also came on for some reason. It turned out eventually that my alternator had a faulty regulator on that sometimes allowed more than 14V back to my battery and that made the lights well light up for nothing.
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