Malfunction Indicator Light (Mil) - BMW 1999-2005 M3 Service Manual

On-Board Diagnostics
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reset using the special scan tool.
Removing the connector from the
ECM or disconnecting the battery
will not erase the fault memory.
The extra hardware needed to operate
the OBD II system consists mainly of
the following:
Additional oxygen sensors
downstream of the catalytic
converters
Fuel tank pressure sensor and
device to pressurize fuel storage
system
Several engine and performance
monitoring devices
Standardized 16-pin OBD II
connector under the dash
Upgraded components for the
federally required 100,000 mile or
10 year reliability mandate
Malfunction Indicator Light
(MIL)
The OBD II system is designed to
illuminate the Malfunction Indicator
Light (MIL) when emission levels
exceed 1.5 times the Federal
standards.
Note:
On model year 1999 and 2000 cars, the
MIL is labeled Check Engine. On model
year 2001 cars, the MIL is labeled
Service Engine Soon.
2/25/2009 11:22 PM