Bosch 0221504029 Ignition Coil

Bosch Ignition Coil for BMW Applications

The Bosch 0221504029 ignition coil is an OE-quality replacement built for BMW engines that use a pencil-style coil with SAE terminal connection. It supports proper ignition voltage, consistent spark delivery, smoother engine operation, improved fuel economy, and lower exhaust emissions.

Designed for BMW 540i, M5, X5, Z8, 325Ci, 325i, 325xi, 330Ci, 330i, 330xi, 525i, 530i, Z3, 320i, 740i, 740iL, 750iL, 323Ci, 323i, 328Ci, 328i, 528i, 323is, 328is, M3, 840Ci, and 850Ci applications, this Bosch ignition coil supports direct-fit service on many inline-six and V8 BMW platforms. The part number 0221504029 is also previously cataloged as 0221504004.

Key Features

• OE-quality Bosch ignition coil for BMW ignition systems
• Pencil coil design for direct cylinder-mounted applications
• 14-volt electrical specification
• SAE terminal type
• Supports correct ignition voltage and stable spark output
• Helps maintain smoother combustion and reduced emissions
• Cross-references Bosch 0221504004 for the same application

Detailed Description

Bosch 0221504029 is an ignition coil replacement for BMW engines that require a pencil coil configuration. Bosch’s OE-level engineering focuses on delivering the correct ignition voltage and a long-lasting spark, which helps the engine run more consistently under load and during everyday driving. If you are replacing a failing coil on a BMW 540i, BMW M5, or BMW X5, this part number 0221504029 provides a direct service solution for the listed applications.

This Bosch ignition coil is used across a wide range of BMW models from 1995 through 2003, including BMW Z3, BMW 528i, BMW 330i, and BMW 750iL applications. For fitment verification, match the vehicle year, model, and ignition coil style before ordering.

What It Helps Address

• Engine misfire or intermittent misfire codes
• Rough idle or uneven engine operation
• Hard starting caused by weak ignition output
• Loss of power under acceleration
• Increased fuel consumption from incomplete combustion

Installation Notes and Tips

Confirm the vehicle uses a pencil coil with SAE terminal connection before installation. Inspect the spark plug connector and surrounding ignition components for wear, carbon tracking, or corrosion while servicing the coil. On BMW engines with multiple coils, compare the existing part number and connector style to Bosch 0221504029 to ensure correct replacement.

Quality Assurance

Bosch ignition coils are built to OE-quality standards and are engineered to deliver the specified ignition voltage and spark performance for the listed BMW applications. This part number 0221504029 is a direct reference for service replacement and is also cataloged under 0221504004.