2003 Forester 2.5X 5MT & 2008 Impreza WRX 5MT & 2009 Impreza 2.5i 5MT
I have a 2003 forester 2.5X 5 MT. I do not have the check engine light on, but today I connected my laptop to the car's ecu and fired up the FREEssm software. It returned a p0030 and said something about a temporary code. I do not have a check engine light on, but the car idles a little rough. I recently changed spark plugs, wires, etc. I mean the car runs good for it's age, but thought I try out this FREEssm with my laptop. I guess my question is since there is no check engine light on should I replace the front Oxygen Sensor/air fuel ratio sensor or why would I be getting this code without a CEL ??