Recently I've been getting 12.9 MPG in my 2.5rs, it's completely stock exept for the K&N Panel Filter, I get a CEL for my knock sensor, it comes and goes, could this be the problem? or maybe my o2 sensors are going?
yes....sorry to hijack, but would a bad 02 sensor cause bad mpg?
front o2 sensorA/F Sensor?