Diagnostic Aids
WARNING: This page is about a different car, the 2006 Suzuki Reno and 2006 Suzuki Forenza. However, it is still accessible from the selected car via links, so may be relevant.
Normal scan tool voltage varies between 0.15 - 8.5 mV while in Closed Loop. If DTC P0139 is intermittent, refer to Intermittents .