Water Pump, OEM - F22 228i, F3X 328i/428i, F10 528i, X3/X4, Z4 28i (N20/N26)

This is the OEM electric water pump used on the F22 228i, F30 328i, F32 428i, F10 528i, X3/X4 28i, and Z4 28i, including xDrive models.

The water pump is an electrical component now and is controlled by the engine computer. It only works when it has to, including even when the engine is shut off. This reduces fuel consumption and has less parasitic drag on the engine. Failures are usually caused by the electronics inside the pump so there is almost no warning of an impending failure or early signs of overheating. One of the only warning signs of electric water pump failure is if the electric fan suddenly starts working all of the time at its highest speed. This is because the pump has stopped, or not responding, and the fans are kicking in to take up the slack. Depending on operating conditions you may only have minutes before the engine shuts off to prevent serious overheating.

The N20 water pump does not seem to have the high failures of the N54 and N55 engines. But given the sudden and unpredictable failure we suggest a preventative replacement before 100,000 miles. Note: there is a factory service action or recall for these models. There are 3 tiers to the service action: install a splash cover, replace the electrical connector, or replace the whole pump. The dealer decides which action to take. The splash cover is available on its own if you wish to add one to your existing or new water pump (see Related Items below).

This is a new N20 electric water pump manufactured by Pierburg, the original supplier to BMW for this water pump as well as many other models. As the original manufacturer this pump meets the design requirements BMW specified when the car was new. By buying OEM you get a high quality part from the original manufacturer at a substantial discount compared to buying from a BMW dealer. This pump has a two year warranty.

Don't forget new mounting bolts! 
This pump does not include the mounting bolts, which we highly recommend buying new as the old ones should not be reused. The part # for the new bolt is 11517602125 and you will want to buy a quantity of 3 of them for the installation. You can find them here, or see the Related Items below.