Intermittent Failures

If the DTC flagged was not present for 2 or more consecutive drive cycles, it is classed as temporary, and will be deleted following 3 drive cycles in which no fault was present. This could result in a reported warning light/message with no stored DTCs. If a fault is present for 3 consecutive drive cycles, the DTC becomes permanent, and will remain in the module's memory for 40 drive cycles. A cycle is an ignition ON/OFF, which will occur during the owner's normal use of the vehicle. No action on the part of the technician is necessary to perform this cycle. A drive cycle is a series of conditions needed to make the on-board diagnostic routine run, and may need a specific action on the part of the technician. See DRIVE CYCLES .