Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why. A P0302 code, for example, would tell you cylinder number two is misfiring. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. Repair short, open, or high resistance on o2 signal circuitĪ P0300 diagnostic code indicates a random or multiple misfire. High resistance or open on O2 signal circuitįuel pressure very high or low - fuel pump or pressure regulatorĬheck for restriction in catalyst and replace as necessary P0137 means the O2 oxygen sensor's voltage remained low for longer than 2 minutes.Ī code P0137 may mean that one or more of the following has happened: P0137 refers to the second oxygen sensor on Bank 1.
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