tighten fuel cap light stays on
http://www.smogtips.com/check-engine-light-turn-on-off.cfm. best bet is to take it to a mechanice so he can use a device called a battery tender. This is plugged into the cigar lighter socket before you disconnect the power and ground cables to not only hold the radio station presets, clock settings but also keep the on-board memory alive for the power-train control module (PCM).
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