Check engine light on - think it is bad O2 sensor - is there any damage
that can result of running the van with out replacing this sensor? Only
drive less that 150 miles a month and vehicle seems to be running well
with no change in mileage, etc. Do not want to fork over the $200 to $350
to replace it right not. Do any of the auto parts stores read the car
computer for a error code free?