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Poorly running engine, No Malfunction Indicator Lamp
Most likely, this condition is not due to computer system failures, but reading
codes can still be useful as part of a basic troubleshooting procedure. Check
wiring and bulb for Check Engine light failures. Refer to vehicle service manual
for additional diagnostic information.
On OBD II vehicles, the Malfunction Indicator Lamp also signals an emissions-
control related failure. The vehicle may not run any differently, but the OBD II
system is designed to note very small changes in the engines operation which
could lead to emissions damage or failure.