Operation Section Table 2. Diagnostic Fault Codes (Flash Codes) cont’d. (*) Fault actions shown are default values specified by the OEM. 80 DFC PROBABLE FAULT FAULT ACTION * CORRECTIVE ACTION FIRST CHECK 933 TransOilTemp Excessive transmission oil temperature (1) TurnOnMil (2) DelayedEngine Shutdown Refer to drivetrain manufacturer’s transmission service procedures. 994 ServiceFault4 Service Interval 4 has been reached-replace HEGO sensors TurnOnMil Replace Pre-catalyst HEGO sensor Replace Post-catalyst HEGO sensor 995 ServiceFault5 Service Interval 5 has been reached-replace timing belt TurnOnMil Replace engine timing belt