BDFHYK UF156 ignition coil and 4503 spark plug set for Toyota 3.4L V6

BDFHYK UF156 ignition coil OE-style replacement for Toyota Tacoma

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BDFHYK 3 Ignition Coil UF156 6 Iridium Spark Plug 4503 Fits For Toyota 1995-2004 Tacoma,2000-2004 Tundra,1996-2002 4Runner 3.4L V6

$62.99

Type Ignition Coil + Spark Plug Set
SKU BDDLZ-BD-05-01905-CK
OE Number For Coil: UF156, C1041, GN10184, C-509, 90919-02212
OE Number For Spark plug:4503

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Technical Specifications

Brand & Model	BDFHYK UF156 Ignition Coil & 4503 Iridium Spark Plug Set
Package Includes	3x BDFHYK ignition coils (UF156) + 6x iridium spark plugs (4503)
Replacement Type	OE-style aftermarket ignition coil and spark plug service kit
Ignition Coil OE	UF156, C1041, GN10184, C-509, 90919-02212
Spark Plug OE	4503
Toyota Tacoma Fitment	Toyota Tacoma 1995-2004 3.4L V6 listed applications
Toyota Tundra Fitment	Toyota Tundra 2000-2004 3.4L V6 listed applications
Toyota 4Runner Fitment	Toyota 4Runner 1996-2002 3.4L V6 listed applications
Toyota T100 Fitment	Toyota T100 1995-1998 3.4L V6 listed applications
Fitment Checks	Confirm 3.4L V6 engine, coil reference, spark plug reference, connector shape, mounting points, plug reach, seat type, and gap requirement
Common Symptoms	Engine misfire, rough idle, hard start, hesitation under load, poor acceleration, poor fuel economy, check engine light
Diagnostic Notes	Symptoms may also come from plug wires if equipped, damaged connectors, fuel delivery issues, vacuum leaks, sensor faults, or compression problems
Installation Notes	Inspect old plugs, check gap requirements, and follow Toyota-specific torque guidance
Critical Note	Do not order by Toyota model name alone. Year, engine, OE reference, connector, and plug specification must match
Important Note	This is not a factory-branded Toyota part

UF156 Ignition Coil and 4503 Spark Plug Set for Toyota 3.4L V6

This BDFHYK UF156 ignition coil and 4503 iridium spark plug set is designed for listed Toyota 3.4L V6 applications including Tacoma, Tundra, 4Runner, and T100. It is intended for ignition system service when the original coils or spark plugs have been diagnosed as worn, weak, damaged, or related to misfire symptoms. For many Toyota truck owners, the main concerns are exact year and engine fitment, OE reference matching, plug quantity, connector fit, and whether replacing ignition coils and spark plugs together makes sense.

Vehicle Fitment for This Toyota Ignition Kit

Make	Model	Listed Years	Engine	Fitment Check
Toyota	Tacoma	1995-2004	3.4L V6	Confirm UF156-style coil, 4503 plug reference, connector shape, and ignition layout.
Toyota	Tundra	2000-2004	3.4L V6	Compare original coil reference, mounting points, and plug requirement.
Toyota	4Runner	1996-2002	3.4L V6	Confirm engine and original coil design before ordering.
Toyota	T100	1995-1998	3.4L V6	Check coil reference, connector, and plug specification against the removed parts.

Fitment note: Toyota model names alone are not enough for ignition parts. Confirm the exact year, 3.4L V6 engine, original coil reference, connector shape, and spark plug specification before installation.

When Ignition Coils and Spark Plugs May Need Replacement

Ignition coils and spark plugs may need service when a Toyota 3.4L V6 has hard starting, rough idle, hesitation under load, misfire symptoms, poor acceleration, reduced fuel economy, or a check engine light. These symptoms can also come from worn plug wires if equipped, damaged connectors, fuel delivery issues, vacuum leaks, sensor faults, or compression problems. If a coil circuit code appears, review the P0351-P0354 codes guide before replacing parts.

UF156 and 4503 Reference Checks

Compare UF156, C1041, GN10184, C-509, and 90919-02212 with the original ignition coil.
Compare spark plug reference 4503 with the plug required for the Toyota 3.4L V6 application.
Confirm that 3 ignition coils and 6 iridium spark plugs match your repair quantity.
Check connector fit, coil mounting, plug reach, seat type, heat range reference, and gap requirement.

Service Notes for Toyota Ignition Coils and Spark Plugs

Before installing ignition coils and spark plugs, inspect the old plugs for fouling, check plug gap requirements, inspect coil connectors and boots, and follow vehicle-specific torque guidance. If the engine still misfires after installation, continue diagnosis by checking wiring, fuel pressure, intake leaks, and compression. For parts and labor planning, see ignition coil replacement cost. This BDFHYK set is an OE-style aftermarket replacement, not a factory-branded Toyota part.

Q: Will this UF156 ignition coil and spark plug set fit my Toyota 3.4L V6?

A: It is listed for selected Toyota Tacoma, Tundra, 4Runner, and T100 3.4L V6 applications. Confirm year, engine, original coil reference, and 4503 plug reference before ordering.

Q: What does the package include?

A: The package includes 3 ignition coils and 6 iridium spark plugs. Confirm this quantity matches the repair plan for your engine.

Q: Which OE references should I compare?

A: Compare UF156, C1041, GN10184, C-509, 90919-02212, and spark plug reference 4503 with the original parts.

Q: Can this help with a check engine light?

A: It may help if the coil or spark plugs are diagnosed as faulty. A check engine light can also involve wiring, fuel, vacuum, sensor, or compression faults.

Q: Should I check the plug gap before installation?

A: Yes. Follow vehicle-specific service information for spark plug gap and torque. Avoid damaging fine-wire electrodes during inspection.

Q: Is this a factory Toyota part?

A: No. This is a BDFHYK OE-style aftermarket replacement, not a factory-branded Toyota 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.

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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.