Tag Archives: oxygen sensor

Check Engine Light Code P0138: Why You Shouldn’t Assume It’s A Worn Oxygen Sensor

Check Engine Light Code P0138: Why You Shouldn’t Assume It’s A Worn Oxygen Sensor

Check Engine Light Series: Article #2 Did you know there are more than 1,400 reasons that can cause your vehicle’s “Check Engine” or “Service Engine Soon” warning light to turn on? The light is part of your vehicle’s on-board diagnostics (OBD-II) system and can indicate anything from a quick fix like a loose gas cap to a major […]

Oxygen Sensor Basics

Oxygen Sensor Basics

WHAT IS AN OXYGEN SENSOR? Many  people  are  mystified  about  the  workings  of  that device  in  the  exhaust  system  called  the  oxygen  sensor (02S). How  does  something  in  the  exhaust  stream generate voltage  and  help  the  engine  control  module (ECM) to  adjust  the  air/fuel mixture?  What  makes  an 02S go bad? The  heart  of  a  typical  02S  […]