Q: new car battery on 2005 Chevrolet Malibu Maxx

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
put in a new battery & i failed inpection. ?
(1) Answer
Are you saying you failed the state mandated smog inspection? If so here is why. There are emission "monitors" which the powertrain control module (PCM) must run before the smog inspection will pass no matter what the tail pipe readings are. This system is not special to your 2005 Chevrolet Malibu. This is mandated by the federal government and all vehicles sold in the US since 1996 are so equipted. Disconnecting the battery can sometimes cause the PCM to reset all its emission monitors. Normal driving (city and highway) for a few days (about 30 miles) should cause the emission monitors to run and allow you to pass your smog inspection if everything else is OK.
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