Fuel System Monitor Not Ready Uncover the Underlying Reasons

If the PCM reads more or less fuel than that the evap monitor WILL NOT start and this has to be done twice with a minimum of an 8 hour cool ... If too many readiness indicators are "incomplete," the vehicle will fail the inspection because it means that the vehicle has not been operated ... I can have that one show not ready. Fuel system must show ready to pass smog.I have replaced the fuel cap, battery, fresh fuel multiple times, ... Issue #1: -After doing the driving sequence for 3 times, everything was ready, but FUE (Fuel System) monitor was not ready. ... Issue #2: - ... My guess and the most likely culprit of why you're not getting into a ready-state is that the heater element in one of your oxygen sensors is ... The EVAP monitor will only run if the fuel level is between about 1/4 and 3/4. It will not run on a full tank, or a near empty tank. The "Readiness Monitor" reports. Catalyst: Not Ready Fuel System: Not Ready O2 Sensor: Not Ready O2 Sensor Heater: Not Ready not set on certain flex fuel models. Readiness monitors are disabled for operation if greater than >E10 blends. The monitor will ignore all 11 ... Why is my EVAP monitor not ready? ... Your EVAP monitor may not be ready due to incomplete drive cycles, unresolved system issues, or faulty ... Its possible they are not fully passing, yet are not fully failing that monitor test. Sometimes it is not even the sensor itself, but a circuit related issue, ...