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  1. P0603 and Sound

    2002-2006 Nissan Altima Discussion (2.5 & 3.5)
    I'm an idiot and forgot to disconnect the negative lead on my battery yesterday before welding the exhaust. The code clears after removing the neg lead and reattaching, but comes back after driving for a bit. I noticed the sound when turning the key to the ON position before turning it over. I'm...
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