Vibrating noise when car is off?

[tm123]

thanks
a guess is better than nothing lol
im throwing cel 12 and 41
12 because i blocked egr and removed all the vacuum system
41 is primary oxygen sensor heater

if i replace my o2 sensor NOT with bosch, will it fix it?
and also i will prolly get better mpg...?

[Ghetto_CB7]

O2 sensor error...

You have an o2 sensor error and you wonder why you have bad gas mileage....

The humming is nothing to worry about.

If it is you fuel pump. Then it could pump fuel all day long, or until your battery died, without decreasing your fuel mileage. Fuel will not be put into the engine unless your injectors are open. This does not happen without the car actually being on. So you would just flow fuel up through the pump through the rail and back into the tank, until the battery died.

Unless you had a leak, then you would loose gas, however you would find gallons of gas on the floor every morning.

[tm123]

wordd thanks
i know now why i have low mpg