I have a code that is related to this sensor and I wanted to know what it controls and about how much it is for a new one. Thanks.

 

It's a barometer sensor. It measure the density of the air.

 

It's the same thing as a MAP sensor (Manifold Absolute Pressure) except that it isn't connected to the intake manifold- it just reads ambient air pressure. That's about 15 PSI or 30" of pressure unless you're in the eye of a hurricane!

It's located, oh geez, I forget, on the firewall, I think? Should be 2 little black "boxes" close to eachother, one of them has a vacuum line going to it, the other (which looks exactly the same) looks like it should, but it doesn't.

 

so does that mean that there is no MAP sensor? I guess I should replace it if i am getting a code for it. Would this cause the car to run not as it should or give bad gas milage? Thanks.

 

A MAP sensor measures manifold pressure (or present vacuum). They are both pressure sensors, but they measure at different points. The baro sensor is used to determine air density/altitude for fuel mixture reference. The MAP sensor is used to determine engine load, for fuel mixture reference.

You may have a MAP sensor - it depends on what engine you have. When asking questions about your car, it helps to list the car and engine for us to help you...

Before you replace it, do a few quick checks.

1. Is it plugged in?
2. Unplug it and check the terminals - everything OK?
3. Inspect the wiring harness.
4. Make sure NO VACUUM lines are connected to the port on the bottom of the sensor. That's a very common mistake.
5. Remove the sensor and make sure the port is clear. Insects and dirt can clog the port, causing an incorrect signal.

If everything is OK, replace the sensor. It should be pretty cheap.