2002 Cadillac DeVille Questions

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My dash info and lights went on and finallythe dash lights went out. When I shut the motor of it won't crank at all.Is this an indication of a bad battery or an alternator problem?
I changed the break booster and the break box where lines ore divided and still no luck
I had just stopped at a stop sign and as I was going on I lost D 123 & R ,,,but still have park ! The fluid does not smell burnt, and its not milky,. My code reader gave me nothing on the transmission, according to t...
does this module control the direction of the air flow
assume it is a coil bank issue...how do i know which of the two banks it is?
Check engine light came on and blinking these are the codes what is the problem i'm a female and the shop is telling me different things I need help. thanks what should I be looking for