catalytic converter AUDI A4 1998 B5 / 1.G 01V Transmission OBD Functions Workshop Manual

01-5

Malfunction Indicator Lamp (MIL)
function, checking

If emissions malfunctions are recognized by the
TCM, the Malfunction Indicator Lamp (MIL) will
be switched on.

Location of the MIL: integrated in speedometer in instrument cluster
Notes:
When the MIL is switched on, it will either blink or light continuously. The
DTC memory for the TCM must be checked page 01
-43
.
MIL flashing: there is a malfunction that could damage the Three Way
Catalytic Converter (TWC). In this case, drive only with reduced
power. MIL continuously on: there is a malfunction that degrades emissions.
Check DTC memory of the Engine Control Module (ECM) or the TCM. If there are driveability problems (e.g. a customer complaint) and the
MIL is not on, perform the MIL functional because malfunctions can be
stored that do not switch the MIL on.
Pa
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(OBD
), function
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