The deflection pulley keeps the main drive belt on-track as it runs the water pump, alternator, and other auxiliaries. This deflection pulley is manufactured by INA, an original equipment supplier to BMW, and repackaged by IPD Germany.
Please note that this part fits the E87 118d without electric steering only, and the 320d/330d with electric steering only. If you're unsure, please feel free to send us your VIN and we will be happy to check on your behalf.