BDFHYK 6 Ignition Coil UF226 and 6 Iridium Spark Plug 6418 for BMW 320i, 325i, 325is, 525i, 525iT 2.0L 2.5L L6

$106.99

Type Ignition Coil + Spark Plug Set
SKU BDDLZ-BD-05-11354-CK
OE Number For Coil: UF226, 12131730766, 12131402440, 12131726178, 12131748395, 1727108, 1317232, 1703360
OE Number For Spark plug:6418

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Technical Specifications

Brand	BDFHYK
Product Type	Ignition Coil & Iridium Spark Plug Kit
Primary Coil Reference	UF226
Spark Plug Reference	6418
Package Quantity	12 Pieces Total
Includes	6 Ignition Coils + 6 Iridium Spark Plugs
Ignition Coil Design	Coil-on-Plug / Bolt-On Style
Spark Plug Construction	Iridium Center Electrode with Ceramic Insulator
Engine	2.0L L6; 2.5L L6
Listed Vehicle Fitment	1992-1995 BMW 320i 2.0L L6; 1992-1995 BMW 325i 2.5L L6; 1992-1995 BMW 325is 2.5L L6; 1991-1995 BMW 525i 2.5L L6; 1993 BMW 525iT 2.5L L6
OE / Interchange References	UF226, 12131730766, 12131402440, 12131726178, 12131748395, 1727108, 1317232, 1703360
Common Service Scenarios	Rough idle, cold-start shaking, hard starting, cylinder-specific misfire, hesitation under acceleration, load-related misfire, scheduled ignition maintenance
Fitment Checks	Confirm model year, 2.0L/2.5L L6 engine, UF226 or one listed OE/interchange coil reference, 6418 spark plug reference, and original connector/component shape before ordering.
Installation Checks	Inspect connectors, coil boots and plug wells; keep plug wells clean and dry; verify plug reference; install spark plugs to vehicle service specifications; fully seat coils and electrical connectors.

UF226 Ignition Coil & 6418 Iridium Spark Plug Kit for BMW 320i, 325i, 325is, 525i & 525iT L6

The BDFHYK UF226 ignition coil and 6418 iridium spark plug kit includes six ignition coils and six iridium spark plugs for the listed BMW inline-six applications. The 6-coil + 6-plug quantity matches a complete ignition service set for the confirmed 2.0L and 2.5L L6 fitments below.

UF226 / 6418 BMW 2.0L & 2.5L L6 Fitment

Year	Model	Engine
1992–1995	BMW 320i	2.0L L6
1992–1995	BMW 325i	2.5L L6
1992–1995	BMW 325is	2.5L L6
1991–1995	BMW 525i	2.5L L6
1993	BMW 525iT	2.5L L6

Confirm the exact model year and engine before ordering. Compare the original ignition coil with UF226 or one of the listed OE/interchange references and verify spark plug reference 6418.

What Is Included in the UF226 & 6418 BMW Ignition Set?

6 BDFHYK UF226 OE-style aftermarket ignition coils
6 6418 iridium spark plugs
Complete six-cylinder service quantity for the listed BMW L6 applications

UF226 Coil and 6418 Spark Plug Reference Numbers

Ignition coil references: UF226, 12131730766, 12131402440, 12131726178, 12131748395, 1727108, 1317232, 1703360.

Spark plug reference: 6418.

UF226 / 6418 Service Scenarios for BMW Inline-Six Engines

Rough Idle or Cold-Start Shaking

Uneven idle, hard starting or cold-start shaking may involve a weak ignition coil, worn spark plug or another ignition-system fault. Inspect coil connectors, boots, plug wells and spark plugs before replacing components.

Hesitation or Misfire Under Acceleration

A cylinder-specific or load-related misfire can be associated with ignition coil or spark plug condition, but wiring, injectors, fuel delivery, vacuum or intake leaks, sensors, compression and mechanical timing should also be considered.

Complete Six-Cylinder Ignition Maintenance

For the listed 2.0L and 2.5L L6 applications, six ignition coils and six spark plugs provide a full-cylinder service quantity when complete ignition maintenance is appropriate.

A diagnostic trouble code alone does not prove that an ignition coil has failed. Confirm the affected cylinder and continue system diagnosis if a misfire remains after service.

How to Confirm UF226 and 6418 Fitment Before Ordering

Confirm the exact BMW model and model year.
Confirm the listed 2.0L L6 or 2.5L L6 engine.
Compare the original coil with UF226 or one of the listed OE/interchange references.
Verify spark plug reference 6418.
Compare the electrical connector, coil body and boot profile with the original components.

Installation Checks for the UF226 / 6418 BMW Kit

Inspect electrical connectors and terminals for corrosion, looseness or heat damage.
Inspect coil boots and spark plug wells for oil, coolant, moisture or debris.
Keep spark plug wells clean and dry before installation.
Verify the 6418 spark plug reference and follow vehicle service information for installation specifications.
Fully seat each ignition coil and electrical connector before restarting the engine.
If a misfire remains, inspect the rest of the ignition, fuel, intake and mechanical systems rather than assuming another new coil is required.

For additional service guidance, see when to replace ignition coils and spark plugs together and how to test an ignition coil.

Difficulty Moderate

Estimated Time 0.5–1 hour

Tools Required

Screwdrivers
Service manual specific to your vehicle
Socket set and ratchet
Wrenches

Pre-Installation Checklist

Stop the engine before disassembling or replacing the ignition coil.
Check the spark plugs and spark plug wires as part of diagnosis.
Keep the installation area clean and dry.
Make sure the ignition coil connections are correct.
Refer to the service manual for your specific vehicle because removal order and connector or fastener details can vary by make and model.
Disconnect the negative battery cable before working on the ignition system.

Installation Steps

Disconnect the battery. Remove the negative battery cable by loosening the clamp bolt with a socket or wrench.
Locate the ignition coils on top of the engine. They may be attached to the engine block or surrounding components.
Disconnect and remove the old ignition coil. Remove the mounting bolts or screws and disconnect the electrical connector(s). The order can vary by vehicle, so follow the vehicle-specific service manual. Remove the old coil once fully disconnected.
If one coil serves multiple spark plugs and has multiple electrical connections, mark or label the connectors so they can be reattached to the correct terminals.
Install the new ignition coil in the reverse order of removal. Secure the mounting bolts or screws and reconnect the electrical connector(s) in the correct positions.
Reconnect the negative battery terminal. Hand-tighten the connection, then tighten the terminal bolt with a socket or wrench. Do not over-tighten.
Close the hood, start the engine with the vehicle in Park, and confirm it starts and idles normally. If it does, test-drive the vehicle.

Post-Installation Verification

Confirm the new ignition coil is securely mounted.
Confirm all electrical connectors are connected to the correct terminals.
Confirm the negative battery terminal is reconnected and tightened sufficiently without over-tightening.
Start the engine in Park and confirm it starts and idles normally.
If idle is normal, test-drive the vehicle and check for remaining misfire or drivability symptoms.

Troubleshooting

Spark plug and wire checks from the manual:
With the engine running, disconnect spark plug wires one at a time and observe engine-speed or roughness changes; the manual states that no significant change can indicate a bad spark plug.
The manual describes checking for spark by holding the end of a disconnected spark plug wire near a metal surface and looking or listening for a spark or cracking sound.
While the engine is cranked, check for spark at each spark plug wire; the manual states that no spark can indicate a dead wire.
Make sure battery, ignition, coil, and spark-plug wire connections are secure. Wiggle connections and retest if a loose connection is suspected.
Keep spark plug ends clean and free of dirt, oil, or grease; clean and retest before replacing a plug.
Inspect wires for cracked, cut, scraped, or burned insulation. Check boots and terminals for damage, corrosion, or poor contact.
Check for corrosion between the boot, spark plug, and ignition coil, and inspect the spark plug for discoloration or damage.
Inspect spring clips and wire retention at the distributor and spark plug ends to make sure connections are held securely.
Ignition coil failure can cause one or more cylinders to misfire, stuttering, sluggishness, and other drivability issues.

BDFHYK Ignition Coil Installation Guide

Q: What is included in this UF226 and 6418 kit?

A: The kit includes 6 UF226 ignition coils and 6 6418 iridium spark plugs.

Q: Which BMW models are listed for this kit?

A: It is listed for 1992-1995 BMW 320i, 1992-1995 325i, 1992-1995 325is, 1991-1995 525i and 1993 525iT applications.

Q: Which engines are covered?

A: The confirmed engine applications are 2.0L L6 for the listed 320i and 2.5L L6 for the listed 325i, 325is, 525i and 525iT.

Q: Is the 6-coil and 6-plug package a complete service quantity?

A: Yes. Six coils and six spark plugs provide a full-cylinder ignition service quantity for the listed inline-six applications.

Q: Which ignition coil references should I compare?

A: Compare UF226 and references 12131730766, 12131402440, 12131726178, 12131748395, 1727108, 1317232 and 1703360 with the original coil.

Q: Which spark plug reference is included?

A: The included iridium spark plug reference is 6418.

Q: Can worn coils or spark plugs contribute to a misfire or rough idle?

A: Yes. Coil or spark plug condition may contribute to rough idle, hard starting, hesitation or a cylinder-specific misfire, but other ignition, fuel, intake and mechanical causes should also be diagnosed.

Q: Should all ignition coils and spark plugs always be replaced together?

A: Not always. Replacement should follow condition, diagnosis and service needs. This kit provides a complete six-cylinder quantity when full-set ignition maintenance is appropriate.

Q: What should be checked before installing the ignition coils?

A: Compare the UF226 coil and connector with the original parts, inspect terminals and coil boots, and check the spark plug wells for oil, coolant, moisture or debris.

Q: What should be checked before installing the spark plugs?

A: Verify reference 6418, keep the plug wells clean and dry, inspect the threads and follow vehicle service information for installation specifications.

Q: What should be checked if a misfire remains after installation?

A: Continue diagnosis of wiring, connectors, injectors, fuel delivery, vacuum or intake leaks, sensors, compression and mechanical timing. A trouble code alone does not prove a coil has failed.

Q: Are these factory-branded BMW parts?

A: No. These are BDFHYK OE-style aftermarket service components intended to match the listed applications and references.

Returns & Refunds

We accept returns within 30 days of delivery for eligible items. If the product is unused and in original condition, you may request a return according to our refund policy. Full policy details: View Refund Policy . We recommend contacting our support team before initiating a return to ensure the fastest resolution.

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If you purchased the wrong part, received an incompatible item, or need installation assistance, please contact us directly.

Email: service@bdfhyk.com

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Before vs After Replacement

Replacing worn ignition coils and spark plugs helps restore stable ignition and smoother engine performance.

BEFORE

Rough Idle & Engine Vibration Noticeable engine shaking while idling. Irregular exhaust flow may indicate unstable ignition performance.

AFTER

Fast Start & Stable Idle IMore consistent spark delivery reduces misfires and stabilizes idle speed.

BEFORE

Sluggish Acceleration Weak throttle response at lower RPM. Vehicle may feel underpowered.

AFTER

Enhanced Power Response Improved throttle response and smoother acceleration

BEFORE

Increased Fuel Consumption Poor combustion can lead to higher fuel usage.

AFTER

Improved Fuel Efficiency Optimized ignition supports more efficient combustion.

Performance improvements may vary depending on vehicle condition.