OBD
I and Prior Check Engine Light (CEL)
The
emissions malfunction indicator on pre OBD II vehicles (most models
prior to 1996) is known on some models as the "Check Engine", "Power
Loss", "Service Engine Now", or "Service Engine Soon" light. This light
is intended to alert the operator when there is a failure in the system
that may cause an increase of harmful emissions.
The
light illuminates when the ignition key is in the ON position and the
engine is OFF; this is to functionally test the system and check the
bulb. When the light turns ON during engine operation, even
momentarily, a system diagnosis is necessary to determine the fault.
When
the light is ON steady it means there is a fault currently detected. If
the light illuminates and then turns off it can mean that the fault is
intermittent or that the fault is only being detected intermittently.
In either case, if the light is intermittent it usually means the
technician will have to try to recreate the operating conditions under
which the light illuminates in order to diagnose the problem.
Diagnosis
of an intermittent problem is more difficult, sometimes a hit or miss
situation, and sometimes requires bringing the vehicle in several times
before the fault is located. Although this warning lights purpose is to
warn of increased emissions, in most cases if the system is not
promptly repaired, damage to other components can occur.
For more
information please contact us!
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