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Oxygen Sensor

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OBD-II vehicles typically have oxygen sensors in the exhaust flow ahead of and behind the catalytic converter(s), twice the number of sensors as non-OBD-II vehicles. OBD-II systems are also capable of monitoring misfires based on individual engine cylinder. Some codes point to the oxygen sensor as a possible problem, but to be sure, it’s often best to make voltage measurements on the sensors to determine its health.