So your 1992 Toyota Camry failed for high CO. Basically your Toyota Camry is
running "rich". Too much fuel is entering the engine. CO stands for Carbon
Monoxide. It is a by-product of incomplete combustion. If your Toyota does
have a "rich fuel" problem the diagnosis should begin with inspecting all
possible mechanical faults which could cause too much fuel to enter the
combustion chambers. You need to make sure your Toyota Camry doesn't have
high fuel pressure, air restrictions and/or leaking fuel injectors.
Something as simple as a dirty air filter may restrict ample air from
entering the engine. The lack of air will create a rich fuel condition and
result in high CO. Although we do have to note CO in excess of .20 is
usually related to something other then a dirty are filter.
One of the first electronic emissions components to inspect should be the
oxygen sensor and the fuel injection "feedback" system. You need to make
your Toyota Camry's oxygen sensor is working properly, the emission computer
or engine control computer is receiving the signals from the oxygen sensor,
the computer is computing the data properly and sending the correct signals
to the fuel injectors to either increase or decrease fuel delivery to the
engine.
At the end of the feedback test it will be know whether the high CO fault is
electronic or mechanical, and the technician can further diagnose the fault.
Unless you have the proper tools to diagnose smog check or emissions
problems, and the knowledge, we recommend having a certified smog check
repair station conduct a hands on diagnosis to find out why your Toyota
Camry produced high CO and didn't pass the smog test.
