On OBD II systems, failure to clear DTCs will result in the temporary disablement of the non-continuous system monitors.

Question

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When DTCs (Diagnostic Trouble Codes) are not cleared after a repair or maintenance, the OBD II system will disable the non-continuous monitors temporarily. This is done to prevent false readings and ensure accurate monitoring of emissions and performance. The non-continuous monitors will only resume their testing function after successful completion of a drive cycle, during which the vehicle is driven under specific conditions to allow the monitors to run their tests.

On OBD II Systems, Failure to Clear DTCs Will Result