The motorist has no way of knowing if the problem is something serious or only a minor glitch. The Check Engine light is very confusing to most motorists because it doesn’t reveal anything about the nature of the fault. In some situations, the OBD II system will set a “pending” code in its memory that does not turn on the Check Engine light, but will eventually turn the light on if the same fault happens on a subsequent trip. If a fault is detected, the OBD II system will set a code and turn on the Check Engine light to alert the driver that something is amiss. The Onboard Diagnostic (OBD II) system is capable of detecting most sensor faults if a sensor is not reading within its normal range or if the signal is lost altogether. In other words, they are designed to last the life of the vehicle or until they fail. This, in turn, can cause emissions, performance and drivability problems.Ĭlick here for a video about replacing O2 sensorsĮxcept for some early 1980s vintage oxygen sensors, most sensors have no factory recommended replacement intervals. Without accurate input data, the computer may not make the correct command decisions. They are like the nerve endings of the vehicle. Sensors provide the inputs the Powertrain Control Module (PCM) needs to make critical control decisions.
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