[xxx] the engine does not idle. when i would slow to stop for a stop light or stop sign, th engine would quit and require restarting the engine. the check engine light remained illuminated continuously, and, the red battery light would illuminate. a service station diagnosed the problem as either an old battery, and/or, an alternator. ourisman mazda, 801 rockville pike, rockville, maryland 20852 [301-424-7800] advised me this morning, saturday, 01/13/2018, that: 1.)the problem is the mass air flow filter that required replacement. 2.)there are no recalls for mazda mass air flow sensor failures. 3.) total parts and labor are approximately, $575.00. 4.)the dealership said that the 5 years / 100,000 warranty did not apply to the mass air flow filter. 5.)when i brought the car to ourisman mazda, on 01/12/2018, to have the problem diagnosed. i was asked when and where i last filled the gas tank, (as if a mass air flow failure mimics contaminated fuel. the car was purchased, new, in december 2012,, and has approx.., 75,000 miles of urban / suburban driving, not under dusty conditions. the risk is that the car could unexpectedly stall and with no way to recover quickly. *bf *js parts of this document have been redacted to protect personally identifiable information pursuant to the freedom of information act (foia), 5 u.s.c. 552(b)(6). *tr