N14 barometric pressure sensor

I need some help with my n14 redtop celect plus cummins motor in a 99 freightliner. Yesterday when I was shiftin from 3rd to 4th gear while turning at an intersection I noticed a miss in the motor like it was going to run out of fuel along with loss in power. I checked the guages and noticed that the check engine light was flashing. The ac was on and the engine fan was running at the time. It was very brief and I continued to drive. Once I had a chance to have the code read it came up barometric pressure sensor below level 7 times. Im not sure what that means and several of the shops I have went to said they never heard of it. Any help with this would be much appreciated. I can provide engine model number if needed.

 

Dont recall the code number. It was flashing yellow. Code was inactive when I hooked the scanner up. I called peterbilt dealer just ask the question and the told me to unplug sensor on the bottom of the block on the driver side. I did and the code went active. They said ok we got the sensor you need. I went to pick it up and they sold me the ambient tempture sensor but the sensor I unplugged was and oil sensor. I decided that they did not know what they were talking about and when I unplugged the oil sensor it was just a coincidence that the code went active. There was the barometric pressure sensor code and low coolant level code that were inactive. I think the coolant one was never cleared from when the coolant sensor was going bad. where is the ambient tempture sensor located and the barometric pressure sensor?

 

Not sure of the scanner at this moment. When the shop opens in the morning I can go back and record what code # and the type of scanner and then update the post with that information. Whick scan is the most accurate for the cummins motor?

 

Thanks for the input. You are correct about where the barometric sensor is located. Just some info if some one else has this problem........the sensor code will either read barometric sensor or ambient air temp sensor. This sensor in the 99 model is located in a water jacket to the right of the ecm. Problem is they have discountined the old style sensor that sits inside a water jacket. The new style sensor just plugs into the wire harness and you have to zip tie it to the harness. There is no place on the older motor to snap the new sensor in place. Silly me I thought when the dealership sold me the part they would have told me this seeing that I gave them the engine model number. Never the less the problem has been solved thanks to the input I got here and google. Thanks to all those who replied hope I can pay it forward.