Hiya Guys… Need some help please! Took my car to the garage yesterday to have the oxygen sensor changed as the engine light was on and they diagnose was the driver side sensor and the guy at the garage told me that the oxygen sensor is not important and does nothing for the car, and if I get it changed it’s best if I do both sensor as it’s a twin one! Is he right? I’m about to have a Milltek exhaust put on and have car re mapped… and I have spoken to my brothers who drives skyline’s & Evo’s and they told me that I will need oxygen sensor change as this will help the ECU know
