Sealey VS8801 Manual page 38

 If a "Stored" Diagnostic Trouble Code is causing the
Yellow LED to light, it is still possible that the vehicle will
be allowed to be tested for emissions and certified.
 If a "Pending" Diagnostic Trouble Code is causing the
Yellow LED to light, it is still possible that the vehicle will
be allowed to be tested for emissions and certified.

If the illumination of the Yellow LED is being caused by
monitors that have not completed their diagnostic testing,
then the issue of the vehicle being ready for an Emissions
Test depends on the emissions regulations and laws of your
local area.
NOTE: From the code retrieval procedure, determine the status of
each Monitor. Take this information to an emissions professional to
determine (based on your test results) if your vehicle is ready for an
Emissions Test.
3) RED LED – Indicates there is a problem with one or more of
the vehicle‟s system. A vehicle displaying a red LED is
definitely not ready for an Emissions Test. The red LED is also
an indication that there are DTCs present. The MIL lamp on the
vehicle‟s instrument panel will light steady. The problem that is
causing the red LED to light must be repaired before an
Emissions Test can be performed. It is also suggested that the
vehicle be inspected/repaired before driving the vehicle further.
If the RED LED was obtained, there is a definite problem
present in the system(s). In these cases, you have the following
options:
 Repair the vehicle yourself. If you are going to perform the
repairs yourself, proceed by reading the vehicle service
manual
recommendations.
and following
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all its procedures and