BMW 3 (E46). Manual — part 27
BMW
code
P-code
Fault type and
function
Signal type and
range
Explanation
222
P0125
Insufficient coolant
temp. to permit
closed loop
operation
Input analog
(0-5V)
Comparison of actual coolant
temperature against
calculated DME value which
varies with load signal.
223
P1180
Oxygen sensor
post-cat (Bank 1),
switching time 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 too long, fault will
set.
224
P1181
Oxygen sensor
post-cat (Bank 2),
switching time 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 too long, fault will
set.
225
P1192
Post-cat sensor
(Bank 1); trim
control
Input analog
(0-5V)
Rationality check for O2
control adaptation with post
catalyst sensor bank 1.
226
P0193
Post-cat sensor
(Bank 2); trim
control
Input analog
(0-5V)
Rationality check for O2
control adaptation with post
catalyst sensor bank 2.
227
P0188
Fuel trim (Bank 1),
O2 control
adaptation limit
DME internal
values logical
Range control of adaptation
values.
228
P0189
Fuel trim (Bank 2),
O2 control
adaptation limit
DME internal
values logical
Range control of adaptation
values.
229
P0133
Oxygen sensor
pre-cat (Bank 1,
slow response time
Input analog (high
is lean) (0-5V)
Checks amount of time
oxygen sensor takes to switch
from rich to lean and vice
versa. If too long, fault will
set.
230
P0153
Oxygen sensor
pre-cat (Bank 2),
slow response time
Input analog (high
is lean) (0-5V)
Checks amount of time
oxygen sensor stays in its rich
or lean state. If it remains
there too long in either fault
will set.
231
P1178
Oxygen sensor
pre-cat (Bank 1),
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
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
BMW
code
P-code
Fault type and
function
Signal type and
range
Explanation
for cylinder 2 is longer, fault
will set.
240
P0303
Cyl. 3 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 3 is longer, fault
will set.
241
P0304
Cyl. 4 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 4 is longer, fault
will set.
242
P0305
Cyl. 5 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 5 is longer, fault
will set.
243
P0306
Cyl. 6 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 6 is longer, fault
will set.
244
Segment timing
faulty, flywheel
adaptation
Input analog
(0-5V)
Flywheel segments are
monitored during deceleration
to establish baseline for
misfire calculation. If
segments are too long/short
(bad flywheel) and exceed
limit, fault will be set.
BMW
code
P-code
Fault type and
function
Signal type and
range
Explanation
245
P1423
Secondary air
injection (Bank 1),
flow too low
Input analog
(0-5V)
Checks to see if oxygen
sensor reacts to increase in
unmetered airflow generated
by secondary air pump
operation. Oxygen sensor
must sense lean condition or
fault will set.
246
P1421
Secondary air
injection (Bank 2),
flow too low
Input analog
(0-5V)
Checks to see if oxygen
sensor reacts to increase in
unmetered airflow generated
by secondary air pump
operation. Oxygen sensor
must sense lean condition or
fault will set.
247
P1432
Secondary air
valve stuck open
Input analog
(0-5V)
Checks to see if oxygen
sensor reacts to increase in
unmetered airflow generated
by secondary air pump
operation. Oxygen sensor
must sense lean condition or
fault will set.
248
P1184
Post-cat sensor;
signal after decel
phase not
plausible; (Bank 1)
Input analog
(0-5V)
Signal is checked for a lean
signal in decel and a
transition between lean to rich
after decel
249
P1185
Post-cat sensor;
signal after decel
phase not
plausible; (Bank 2)
Input analog
(0-5V)
Signal is checked for a lean
signal in decel and a
transition between lean to rich
after decel
250
P0440
Functional check
purge valve
Input analog
(0-5V)
This functional check looks
for reaction of oxygen sensor
signal during canister
purging. Oxygen sensor, air
flow meter and RPM values
must react to purging of
canister.
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