BMW 12131286087 Ignition Coil

Note the radio security code, then disconnect the negative battery cable. Locate the ignition coil. With the ignition OFF, disconnect the ignition lead from the coil tower. Label and remove the wires from the terminals marked 15 (+) and 1 (-). Note that the high voltage wire connector on the center tower terminal is referred to as 4. Using an ohmmeter, measure the primary resistance between the 15 (+) and 1(-) terminals. The primary winding resistance should be 0.82 ohms. Using an ohmmeter, measure the secondary resistance between the 15 (+) and the high-voltage output secondary winding terminal 4. The secondary winding resistance should be 8,250 ohms (8.25 Kilo ohms). Replace the coil if it's not within specifications. Reconnect the negative battery cable and enter the radio security code. For removal and installation, note the radio security code, then disconnect the negative battery cable. Locate the ignition coil. With the ignition OFF, disconnect the ignition lead from the coil lower. Label and remove the wires from the terminals marked 15 (+) and 1(-), then remove the high voltage wire connector from the center tower terminal. Remove the fasteners securing the ignition coil mounting bracket and remove the ignition coil. Installation is the reverse of the removal procedure, noting to enter the radio security code once the battery is connected.