Here is the deal I got my 01 ssei from this guy tht had it sitting in his driveway for years. It runs okay but I know it needs parts to make it run like its supposed to. I know changing the o2 sensor is good but I heard there is two sensors tht I need to change upstream and downstream? What is better? Also is there preformance sensors I could get?

I would like to know the first things I should get done first matinance wise, the things that are going to make a diffrence in preformance of the car.

The only thing I know is that O2 sensors are now considered like spark plugs - part of a tune up. I change the O2 when I change the plugs, but my O2 only costs about $20 - BC

_________________
In Memory of Brad - 1/21/1977 .. 10/23/2013 ...... Aaron - 1977 .. 2017 .....
2017 Hyundai Santa Fe Sport ..... 1992 Bonneville SSE 1SB 170 HP L27 4T60E retired/sold to MattStrike ..... 2005 Bonneville SE 1SC 205 HP L36 4T65E - retired/salvage yard ..... PBCF user 2321