2021 BMW Z4 Electrical Parts

This table covers the alternators that charge the battery and run the electrical load. Typical signs include dim lights at idle, a battery lamp, or a growl from the charging pulley. Load-test the battery and inspect the belt and grounds — a bad ground mimics a failed alternator. Read more

8 Alternator / Generator parts are listed for the 2021 BMW Z4, from PURE ENERGY, FVP and REMY. PURE ENERGY 10396 carries the "Popular" badge. All of them fit every engine offered in the 2021 Z4.

This group includes PURE ENERGY 10396 and PURE ENERGY 10397 and the remaining parts above.

This table covers the batteries listed by group size and specification. Typical signs include slow cranking, a battery lamp, or a no-start after the vehicle sat overnight. Confirm group size and terminal layout in the notes. Clean the posts and the ground before condemning the battery. Read more

16 Battery parts for the 2021 BMW Z4 come from 9 brands — ACDELCO, DEKA, LUCAS and 6 other brands. The "Popular" part is DEKA 9A49. Every part fits both the 2.0L L4 Turbocharged and the 3.0L L6 Turbocharged.

In the AGM (Extended Life) grade, ACDELCO, DEKA, LUCAS and 5 other brands supply 15 parts: grouped under the catalog's "AGM (Extended Life)" designation — the notes column spells out what sets them apart. A representative part number is DEKA 9A49.

In the Performance AGM (Extended Life + Increased Power) grade, FULLRIVER supplies 1 part: grouped under the catalog's "Performance AGM (Extended Life + Increased Power)" designation — the notes column spells out what sets them apart. A representative part number is FULLRIVER FT89049.

This table covers the modules that control the exterior lighting. Read more

VEMO supplies both parts for the 2021 BMW Z4.

Part numbers include VEMO V20730305 and VEMO V20730306.

This table covers the ultrasonic park-aid sensors in the bumper. Typical signs include a warning lamp, a stored code, or a reading that drops out when the harness is wiggled. Inspect the connector and ground before replacing the sensor — wiring faults are often condemned as bad sensors. Read more

5 Parking Aid Sensor parts are listed for the 2021 BMW Z4, from BOSCH, VEMO and STANDARD MOTOR PRODUCTS. All of them fit every engine offered in the 2021 Z4.

Part numbers include BOSCH F00E270801, BOSCH F00E270805 and STANDARD MOTOR PRODUCTS PPS183, among others listed above.

This table covers the brackets that mount the Parking Aid Sensor. Typical signs include a cracked mount, a rattle, or a bracket that no longer holds alignment. Confirm position in the notes. Many brackets look alike and bolt to different corners. Read more

One part is listed for the 2021 BMW Z4 — VARIOUS MFR BM1074121.

This table covers the starter motors that crank the engine. Typical signs include no motion, a squeal, or a motor that only runs on one speed. Confirm power, ground and the control module before replacing the motor. Read more

10 Starter Motor parts are listed for the 2021 BMW Z4, from VALEO, WAI GLOBAL, FVP and 3 other brands. VALEO 438514 carries the "Popular" badge.

In the New grade, VALEO and WAI GLOBAL supply 4 parts: brand-new units rather than rebuilt ones. A representative part number is VALEO 438514.

In the Remanufactured grade, FVP, PURE ENERGY, BOSCH and 1 other brand supply 6 parts: factory-rebuilt units with new wear components. A representative part number is BOSCH SR6597X.