Okay, well yesterday i did an o2 sensor by pass the one at the cat i got a CEL p0420, witch was about the cat, now since that light came on, the cat been making some crazy rattling sound and its just got worse today, so i bypassed the o2 and reset the ECU, CEL was off for maybe 1 day.

now i was at a red light and i went to go forward on the green light and all of a sudden BOOM!

my CEL comes on the Tranny light D4 is Blinking the car hardly moves, i shut down the car just to make sure that its not smoking or anything. i get back into the car i put the car into acc but one light isnt showing and that the BATT light. also when i pull the e-brake my Break light comes on, tell me my trunk and doors are open, everything in the car is dim.

does anyone know what the problem is?

my ALT took a crap on me?

 

Let me tell you why you are just now getting a response:

You use no punctuation and your statements are completely incoherent. It is nearly impossible to understand what you are saying.

 

ok about all i know for sure is your car is OBD II.
Can we have a year and model?

 

Okay, first I would change out the alternator. Then maybe you can explain what else is going on.