Gathering codes on a BMW made before 1995 is performed using the check
engine light in the instrument cluster. Start by turning the ignition key to the
on position but do not start engine. Press the gas pedal five times to the floor in rapid succession within five seconds. When the code gathering is activated the check engine light will flash
on and then off, count the blinks. The first set of blinks will give
the first digit of the trouble code, there will be a pause and then it will restart blinking.
This will be the beginning of the next code digit and so on. For example: twelve
flashes followed by fifteen more flashes the code number is 1215. Use the chart
below to define the code. Once repairs are complete clear the codes by disconnecting the
battery for five minutes.
Code 1211 MCU (computer) malfunction.
Code 1215 Air mass flow sensor fault (MAF.)
Code 1221 Oxygen sensor (O2.)
Code 1222 Oxygen sensor control.
Code 1223 Engine coolant temperature (ECT.)
Code 1224 Air intake temperature.
Code 1231 Battery voltage.
Code 1232 Idle throttle valve switch.
Code 1233 Full load throttle valve switch.
Code 1251/1252 Injection valve.
Code 1261 Fuel pump relay circuit.
Code 1262 Idle speed control valve.
Code 1263 Fuel tank vent valve.
Code 1264 Oxygen sensor heater relay.
Code 1444 No failure.
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Article first published 2017-01-27