BDFHYK UF491 ignition coil and 12578224 spark plug set for GM L4

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BDFHYK 4 Ignition Coil UF491 and 4 Spark Plug 12578224 for Buick, Chevrolet, GMC 2.0L / 2.2L / 2.4L L4

$63.99

Product Detail

Type Ignition Coil + Spark Plug Set
SKU BDDLZ-BD-05-01796-CK
OE Number Coil: UF491, UF645, D522C, 5C1609, E991, E1145, 522204, 521850, 6737201, IGN00100, GN10485, IC748, IC571, 12629646, 12589623, 12638824, 12578224, CLS1136, IC571SB, 50081, C706, 9212090, 9212109, C1552, C1809
OE Number For Spark plug:12578224, XP5263

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UF491 Ignition Coil and 12578224 Spark Plug Set for GM L4 Applications

This BDFHYK UF491 ignition coil and 12578224 / XP5263 spark plug set is designed for listed Buick, Chevrolet, and GMC 2.0L, 2.2L, and 2.4L L4 applications that use matching UF491 / UF645-style coil references. It is intended for ignition service when the original coils or spark plugs have been diagnosed as worn, weak, damaged, or related to misfire symptoms. Because fitment can vary by model and engine, compare OE numbers and the removed components before ordering.

Vehicle Fitment for This UF491 GM Ignition Kit

Make	Listed Engine Group	Fitment Check
Buick	Listed 2.0L / 2.2L / 2.4L L4 applications	Confirm UF491 / UF645-style coil, 12578224 or XP5263 plug reference, and original ignition layout.
Chevrolet	Listed 2.0L / 2.2L / 2.4L L4 applications	Compare the removed coil, plug reference, connector shape, and service information.
GMC	Listed 2.0L / 2.2L / 2.4L L4 applications	Confirm engine, connector, coil body, mounting points, and spark plug specification.

Fitment note: Do not order by make or engine size alone. The original coil reference, connector shape, spark plug reference, and engine configuration must match.

When This GM L4 Coil and Plug Set May Be Needed

Ignition coils and spark plugs may need inspection when the engine has rough idle, hard start, hesitation, misfire symptoms, reduced power, poor fuel economy, or a check engine light. These symptoms can also come from wiring, fuel delivery, intake leaks, sensor faults, timing issues, or compression problems. For cost and service planning, review GM Ecotec ignition coil replacement planning.

UF491 and 12578224 Reference Checks

Compare UF491, UF645, D522C, 5C1609, E991, E1145, 522204, 521850, 6737201, IGN00100, and GN10485 with the original coil.
Also compare IC748, IC571, IC571SB, CLS1136, 50081, C706, C1552, C1809, 12629646, 12589623, 12638824, 12578224, 9212090, and 9212109 where applicable.
Compare 12578224 and XP5263 with the required spark plug reference.
Check connector orientation, coil body, mounting depth, plug reach, seat type, heat range reference, and gap requirement.

Installation and Service Notes

Install on a cool engine, inspect old plugs for fouling, and follow GM service information for plug torque and gap. If symptoms remain after installation, continue diagnosis by checking wiring, fuel delivery, intake leaks, injector operation, sensor data, and compression. This BDFHYK set is an OE-style aftermarket replacement, not a factory-branded Buick, Chevrolet, or GMC part.

Technical Specifications

Brand & Model	BDFHYK UF491 Ignition Coil & 12578224 / XP5263 Spark Plug Set
Package Includes	4x BDFHYK ignition coils (UF491 / UF645-style) + 4x spark plugs (12578224 / XP5263 reference)
Replacement Type	OE-style aftermarket ignition coil and spark plug service kit
Ignition Coil OE	UF491, UF645, D522C, 5C1609, E991, E1145, 522204, 521850, 6737201, IGN00100, GN10485, IC748, IC571, IC571SB, CLS1136, 50081, C706, C1552, C1809, 12629646, 12589623, 12638824, 12578224, 9212090, 9212109
Spark Plug OE	12578224, XP5263
Buick Fitment	Listed Buick 2.0L / 2.2L / 2.4L L4 applications that match UF491 / UF645-style references
Chevrolet Fitment	Listed Chevrolet 2.0L / 2.2L / 2.4L L4 applications that match UF491 / UF645-style references
GMC Fitment	Listed GMC 2.0L / 2.2L / 2.4L L4 applications that match UF491 / UF645-style references
Fitment Checks	Confirm exact year, model, engine, OE reference, connector shape, coil body, plug reach, seat type, and gap requirement
Common Symptoms	Rough idle, hard start, hesitation, misfire symptoms, reduced power, poor fuel economy, check engine light
Diagnostic Notes	Symptoms may also come from wiring, fuel delivery, intake leaks, sensor faults, timing issues, or compression problems
Installation Notes	Install on a cool engine, inspect old plugs for fouling, confirm plug gap, and follow GM service torque guidance
Critical Note	Do not order by make or engine size alone. Original coil reference, connector, spark plug reference, and engine configuration must match
Important Note	This is not a factory-branded Buick, Chevrolet, or GMC part

Q: Will this UF491 ignition coil and spark plug set fit my GM vehicle?
A: It is intended for listed Buick, Chevrolet, and GMC 2.0L / 2.2L / 2.4L L4 applications that match the UF491 / UF645-style coil and 12578224 / XP5263 plug references.

Q: What is included in the package?
A: The package includes 4 ignition coils and 4 spark plugs for listed L4 service applications.

Q: Which OE or interchange references should I compare?
A: Compare UF491, UF645, D522C, 5C1609, E991, E1145, GN10485, IC748, C706, C1552, C1809, 12629646, 12589623, 12638824, 12578224, 9212090, 9212109, and XP5263 with your original parts.

Q: What symptoms may point to worn ignition coils or spark plugs?
A: Common symptoms may include rough idle, hard start, hesitation, misfire symptoms, reduced power, poor fuel economy, check engine light. Diagnose the cause before replacing parts.

Q: Can this kit solve an engine misfire?
A: It may help only when the ignition coils or spark plugs are confirmed as the failed parts. Misfires can also be caused by wiring, fuel, air, sensor, or compression issues.

Q: Do I need exact vehicle fitment before ordering?
A: Yes. Confirm the exact year, model, engine, OE reference, connector shape, and spark plug reference before ordering.

Q: Do I need to check spark plug gap and torque?
A: Yes. Follow GM service information for spark plug gap and torque, and avoid cross-threading the cylinder head.

Q: Should I compare the connector and mounting style?
A: Yes. Connector shape, coil body, boot length, and mounting points should match the removed parts before installation.

Q: What else can cause similar symptoms?
A: Wiring, fuel delivery, intake leaks, sensor faults, timing issues, or compression problems can create similar symptoms. Continue diagnosis if symptoms remain.

Q: Is this a factory-branded part?
A: No. This is a BDFHYK OE-style aftermarket replacement, not a factory-branded Buick, Chevrolet, or GMC part.

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.

Customer Support

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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Mon–Fri 19:00–04:00 (UTC−6 / CST)

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