The exhaust from the driver's side is too lean. A vacuum leak could introduce unmetered air the computer doesn't know about. An injector could be partially blocked with varnish. A misfiring cylinder will flow unburned fuel and air into the exhaust where only the unburned oxygen will be detected. A leak in the exhaust system could allow air to be drawn in before the oxygen sensor.
Saturday, December 15th, 2012 AT 2:12 AM