Does anybody know what would cause to trigger this code?
(PO138 heated oxygen sensor high voltage)
Thanks in advance...

 

Anyone?

 

is your car running very rich? I had my front o2 sensor go out.. cant remember if it was p0138 or p0131. The car was getting 4-6mpg.. just dumping fuel.. spark plugs were black.. its steadily will keep getting worse. If your car is feeling sluggish you may want to consider replacing your front o2 sensor.