im new to the blazers so bare with me lol. everytime we turn the steering wheel the whole front end sinks to either side. say i turn the wheel left then it will sink to the right and when turned to the right it will sink to the left. also how difficult is it to change o2 sensor on a 97 chevy blazer?

 

02 sensors basically just unscrew... hardest part is if they are rusted in there. you can use a 7/8th wrench but if it doesnt come out easily you will start to round it. also for some reason chevys put locks on their s10 oxygen sensor electrical connections like they are gonna fall off or something, so you will see this little blue thing you have to pull out before you can disconnect the clip on the connection

 

anyone have any idea about the front end?

 

When you turn the wheel, alignment angles change and there's a substantial weight shift that causes one side to "sink" and the other to rise.... normal.