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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.


BMW OBD Fault Codes
   

Code

Reason

1211

DME Control module may be bad.

1215

Mass air flow sensor or wiring to the sensor may be faulty

1216

Throttle Potentiometer wiring may be faulty

1221

Oxygen Sensor #1 might be faulty

1222

Oxygen Sensor mixture ratio out of bounds (rich/lean)

1223

Coolant temperature sensor might be faulty. Check wiring

1224

Air Temperature Sensor might be faulty. Check wiring

1225

Knock Sensor #1 Check knock sensor and wiring

1226

Knock Sensor #2 Check knock sensor and wiring

1231

Battery voltage monitor. Check battery voltage and charging

1234

Speedometer. Check wiring to instrument cluster

1237

AC compressor cutoff. Test control module inputs from AC system

1242

AC compressor signal. Test control module inputs from AC system

1243

Crankshaft Position sensor. Check wiring from sensor to control module

1244

Camshaft Position sensor. Test camshaft position sensor and wiring

1245

Electronic transmission control intervention

1247

Ignition monitor. Check secondary voltage to coils

1251

Fuel Injector #1

1252

Fuel Injector #2

1253

Fuel Injector #3

1254

Fuel Injector #4

1255

Fuel Injector #5

1256

Fuel Injector #6

1261

Fuel Pump Control. Check relay and wiring

1262

Idle speed control. Check air control valve

1263

Evaporative system (fuel tank)

1264

Oxygen sensor heater. Check heater and relay

1265

Check engine lamp.

1266

VANOS. Check VANOS solenoid

1267

Air pump relay. Check relay and wiring.

1271

Ignition Coil #1

1272

Ignition Coil #2

1273

Ignition Coil #3

1274

Ignition Coil #4

1275

Ignition Coil #5

1276

Ignition Coil #6

1281

DME Control module memory supply

1282

Fault code memory. Control module may be faulty

1283

Fuel Injector output stage. Control module may be faulty

1286

Knock Control test pulse. Control module may be faulty

1000

Light remains off. All fault codes have been displayed

1444

No more faults




 

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