BMW 1999-2005 M3, Service Manual

Page: 112 / 1258

BMW
code P-code Fault type and
function Signal type and
range Explanation
switch fault will set.
232 P0179 Oxygen sensor
pre-cat (Bank 2),
switch time too
slow Input analog (high
is lean) (0-5V) Checks amount of time
oxygen sensor takes to switch
from rich to lean and vice
versa. If it takes too long to
switch fault will set.
233 P0420 Catalyst efficiency
(Bank 1), below
threshold Input analog
(0-5V) Compares value of pre-cat
oxygen sensor to value of
post-cat oxygen sensor to
measure oxygen storage
capability / efficiency of
catalytic converter. Post-cat
oxygen sensor must be
relatively lean.
234 P0430 Catalyst efficiency
(Bank 2), below
threshold Input analog
(0-5V) Compares value of pre-cat
oxygen sensor to value of
post-cat oxygen sensor to
measure oxygen storage
capability / efficiency of
catalytic converter. Post-cat
oxygen sensor must be
relatively lean.
235 P1190 Pre-cat sensor
(Bank 1):trim
control Input analog (high
is rich) (0-1V) Rationality check for O2
control adaptation with
pre-cat sensor bank 1
236 P1191 Pre-cat sensor
(Bank 2):trim
control Input analog (high
is rich) (0-1V) Rationality check for O2
control adaptation with
pre-cat sensor bank 2
238 P0301 Cyl. 1 misfire
detected DME internal
values logical Crankshaft
speed/acceleration is
monitored by crank sensor.
Time for each cylinder
combustion is compared
against avg. of others. If time
for cylinder 1 is longer, fault
will set.
239 P0302 Cyl. 2 misfire
detected DME internal
values logical Crankshaft
speed/acceleration is
monitored by crank sensor.
Time for each cylinder
combustion is compared
against avg. of others. If time
On-Board Diagnostics http://ebahn.bentleypublishers.com/BMW/3/E46/Repair%20Manuals/8...
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