I replaced my o2 sensor and got engine light to go off, I have been checking to see if codes clear and this morning I now have a 1594 code -battery highy voltage. Seems like it dosen't start strong and if I leave key on for a few minutes the battery light comes on. Had alt checked at Autozone (guy used a multimeter across battery terms and was reading around 14 V - never seen it done like that. Battery is relitively new Diehard replaced about a year ago.
Any thoughts?

BTT

Simply checking the voltage at the battery is not a accurate diagnosis method for determining battery health. Since your battery is still pretty new, take it back to Sears and have them load test it or swap it out for a replacement under warranty.

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02 Liberty Limited
Silver Outside & Taupe Inside
Heated Seats, Sunroof & Infinity speakers
USA Spec I-Pod adaptor, Mopar Sub, Garmin GPS
Tow Package, Select-Trac
Rock Rails, Tow Hooks