heater AUDI A4 1998 B5 / 1.G AFC Engine Cold Start Driveability Problems Workshop Manual

24-43


Cold start driveability
problems, overview
The time interval between cold start (open loop)
and oxygen sensor control (closed-loop), which
requires an oxygen sensor temperature of
approx. 300 C (572 F), is influenced by the
following variables:
Ambient temperature (summer/winter)
Operating conditions after start
Proper function of the oxygen sensor heater
If driveability difficulties occur during cold start,
determine whether the problem occurred during
the open- or closed-loop phase of the startup as
follows (under cold-start conditions):

- Connect VAG 1551 scan tool Repair Group
01.

- Switch ignition ON but do not start engine.

- Select "Read Measuring Value Block" function
08 and advance until display shows "Read
measuring value block 10" (display group 010)
Repair Group 01.
Pa
ge 1 of 4 Cold start driveabilit
y problems, overview
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