Not sure about costs. Wheels should be last on your list. Make sure to look into the o2 sensor deal first. Browse around to find out if there is any way to test which sensor has gone bad. However, as a rule of thumb, it is better to change them all uot at the same time. Are you sure that the auxiliary fan is the one not working? The switch that activates it may have gone bad. Check the switch first (switch is a sensor that is attached to the right side of your radiator; disconnect it, then jumper the middle recepticle on the wiring harness to either of the other two with the ignition ON; if the fan activates, then only your sensor is bad). About the power steering: I'm sorry to tell you this, but your pump may have gone bad. I'll have to do a little research to find out what you can check out before taking it to a shop.
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