A second teen gang member has been busted in last week’s carwash shootout that killed a 13-year-old bystander, authorities said yesterday.

Gregory Calas, 18, an alleged member of the Crips, was arrested Thursday for firing the stray bullet that hit Kevin Miller in Cambria Heights. Calas could get 25 years to life if found guilty of second-degree murder.

Nnonso Ekwegbalu, 16, also a suspected Crip, was arrested last week and faces a similar charge.

Cops said the two opened fire after an altercation with rival Bloods. An unidentified teen was also shot, in the leg.

Neither Miller, a freshman at Campus Magnet Humanities and the Arts HS, nor the second victim was believed to be involved with either gang.

“This case is another example of the mindless gun-related violence and street-gang mentality that turn our streets into battlefields and too often take innocent lives and recklessly endangers public safety,” said Queens DA Richard Brown.

“The result of such gunplay is that a 13-year-old boy . . . is being buried today, and his family must struggle with his loss, and a second innocent teenager is recovering from a gunshot wound.”