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Ultimate-BMW.com BMW Knowledgebase :: The place to go
when you need to know about BMWs
| BMW OBD (On Board Diagnostics) and
Fault Codes |
Last edited/updated on 8/31/04 |
There
are two engine management systems used on 92-99 BMW's,
which differ in significant ways. They are:
OBD
I …………………………………… used on 1992-1995 models
OBD II…………………………………… used on 1996-1999 models (note:
some 99 models are E46 BMWs)
If
you have a BMW car with OBD II engine management you
will need to purchase a fault code or scan tool reader
in order to utilize the BMW codes below.
If
you have a BMW with an OBD I engine mangament system,
then you can read the fault codes from your BMW as follows.
1.
Turn the ignition key on and fully depress the accelerator
five times within a five second period.
2. After this, the check engine light will go through
a sequence of: staying on for five seconds, go off,
stay on for 2.5 seconds, go off for 2.5 seconds.
3. After
this the fault code will flash.
The
BMW fault code is a four digit number, however your
BMW may display more than one fault code. In this case
each code will be seperated by a 2.5 second pause. After
all codes have been displayed there will be a .5 second
flash and the light will stay off. The table below lists
some of the fault codes that could be displayed.
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BMW OBD Fault Codes
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Code
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Reason
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1211
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DME Control
module may be bad.
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1215
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Mass air
flow sensor or wiring to the sensor may be faulty
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1216
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Throttle
Potentiometer wiring may be faulty
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1221
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Oxygen Sensor
#1 might be faulty
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1222
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Oxygen Sensor
mixture ratio out of bounds (rich/lean)
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1223
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Coolant
temperature sensor might be faulty. Check wiring
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1224
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Air Temperature
Sensor might be faulty. Check wiring
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1225
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Knock Sensor
#1 Check knock sensor and wiring
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1226
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Knock Sensor
#2 Check knock sensor and wiring
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1231
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Battery
voltage monitor. Check battery voltage and charging
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1234
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Speedometer.
Check wiring to instrument cluster
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1237
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AC compressor
cutoff. Test control module inputs from AC system
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1242
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AC compressor
signal. Test control module inputs from AC system
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1243
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Crankshaft
Position sensor. Check wiring from sensor to control
module
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1244
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Camshaft
Position sensor. Test camshaft position sensor
and wiring
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1245
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Electronic
transmission control intervention
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1247
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Ignition
monitor. Check secondary voltage to coils
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1251
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Fuel Injector
#1
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1252
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Fuel Injector
#2
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1253
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Fuel Injector
#3
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1254
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Fuel Injector
#4
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1255
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Fuel Injector
#5
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1256
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Fuel Injector
#6
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1261
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Fuel Pump
Control. Check relay and wiring
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1262
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Idle speed
control. Check air control valve
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1263
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Evaporative
system (fuel tank)
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1264
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Oxygen sensor
heater. Check heater and relay
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1265
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Check engine
lamp.
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1266
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VANOS. Check
VANOS solenoid
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1267
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Air pump
relay. Check relay and wiring.
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1271
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Ignition
Coil #1
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1272
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Ignition
Coil #2
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1273
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Ignition
Coil #3
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1274
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Ignition
Coil #4
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1275
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Ignition
Coil #5
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1276
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Ignition
Coil #6
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1281
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DME Control
module memory supply
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1282
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Fault code
memory. Control module may be faulty
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1283
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Fuel Injector
output stage. Control module may be faulty
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1286
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Knock Control
test pulse. Control module may be faulty
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1000
|
Light remains
off. All fault codes have been displayed
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1444
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No more
faults
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