Michael Madsen's September joyride continues to be a drag ... cause the actor has just been charged with 2 counts of DUI stemming from his arrest ... TMZ has learned.
We broke the story ... The "Reservoir Dogs" star was popped while hotrodding around Malibu in his badass Pontiac GTO. According to cops, Madsen bombed his field sobriety test and blew .20 on the breathalyzer -- more than twice the legal limit.
At the time, Madsen's attorney Perry Wander insisted the breathalyzer was "flawed."
On Wednesday, the L.A. City Attorney filed 2 misdemeanor counts of DUI against Madsen -- one for driving under the influence of alcohol or drugs, and another for driving with a BAC of .08 or higher.
If convicted on both counts, Madsen could face up to two years in jail ... but since it doesn't appear Michael has a prior DUI conviction, it's unlikely he'll serve any time behind bars.
Madsen's attorney tells TMZ ... "We intend to vigorously defend the charges."
The case is scheduled to go before the judge later this month.