2004 Chrysler Pacifica Base Sport Utility 4-door 3.5l on 2040-cars

Up for sale is a 2004 Chrysler Pacifica front wheel drive with a 3.5 L V6 gas engine and automatic transmission.  Third Row Seating, Cloth Interior, Sunroof, All electric, CD Player, radio, memory seats, etc.  Mileage - 175K.  This is a car I ride and drive in each day but it is having some issues.  One of the issues is that in the odometer display there is a reading that says "tire sensor failure - Inspect tires"  I took this to our local Chrysler dodge dealer and he checked all of the tires and said I was not loosing any pressure and all of the tires were in good condition but told me that one of the sensors that reads the pressure has probably come demagnitzed or failed and said that it would cost to just hook their computer up to detect which sensor it was and told me that it was fine sense I would be checking tire pressure with each oil change anyway.  The sensors are apparently not that expensive but there is a cost to finding the flawed sensor and changing it out so I just didn't bother.  The second issue is that the engine light is on and when they plugged the computer up to read the message it said something like "O2 Oxygen Sensor failure" This is not just the sensor it is apparently a problem with the catalytic converter ability to convert emissions.  I am not a mechanic but this may be the reason that when I start the engine it has a little bit of a spurt when it first starts kind of like a slow gurgle (I know this sounds weird but I have video of the start and run of the engine so just email me and Ill send you the video) but then keeps running and runs and drives great.  The Heat and AC work great but the display dims. Radio works great and I trust the car to drive anywhere but I am told that this O2 leak will have to be fixed or it will wear the engine down over time.  I don't know if this is a cheap or expensive fix so I just wanted to lay it all out there and make sure you know everything about the car.  I have lots of pics so if something more than what is displayed needs to be seen just let me know.

I encourage anyone close to Owensboro, Ky to give me a message 2sevenzero9twonine5onefive8 and ill give you directions to come for a test drive.  thanks for looking have a great day.