You're driving home from work one day when the car owner's worst nightmare
happens: the check engine light pops on. It comes without warning and with no explanation. For most drivers, this means a trip to the mechanic, but it's not difficult to diagnose (and sometimes fix)
What causes it: Over time, the sensor gets covered in oil ash and
it reduces the sensors ability to change the oxygen and fuel mixture. A faulty sensor not only reduces gas mileage, it also increase emissions.
What you should do: Not replacing a broken oxygen sensor can
eventually lead to a busted catalytic convertor which can cost upwards of $2,000. We will find and replace the sensor which can end up with a savings on other parts.