My car idles like shit. then i replace the O2 and it runs and idles awsome for like 2 days, but after the the cel comes back and it starts running all shitty again. Im useing a bosch O2 sensor from autozone with the 3 month warrenty so i just keep replacing them. But im getting kind of sick of it.

my car had this same problem and it cost me almost $1000 to get it fixed. something about a major electrical failure. id get it to a good electrical mechanic as soon as you can. maybe catch it early.