Lets say a particular automobile sets a code for a coolant temperature sensor malfunction of some kind. I have more about inexpensive scanners I own that can read the data stream at my automotive scan tool review page. Learn how to use the scan tool data stream to identify failed components. You might also want to pull up the data stream for the sub system showing the failure and review the information in real time. No matter what you call them, these failures are set in memory, but have not met the criteria to notify the driver by turning on the warning light. Pending codes are sometimes called history codes. If you own an advanced OBD II auto scan tool you can also check for pending codes. This confirms a hard failure or an intermittent one. It also makes sense to clear it and take a test drive to see if the light returns setting the same one.
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