A diagnostic testing system for a vehicle comprising an oxygen sensor
having a heating element for heating the oxygen sensor to its minimum
operational temperature, an analyzer having a user interface, a
communications link between the analyzer and the vehicle to obtain data
from the oxygen sensor, and a diagnostic heuristic analyzing the data and
confirming proper operation of the heating element, the diagnostic
heuristic being adapted to generate an output and transmit the output to
the user interface, the output including the results generated by
analysis of the data by the diagnostic heuristic.