How to disconnect the ignition coil and remove the upper engine cover on Mazda 3?

Disconnect the cable from the negative battery terminal. Remove the upper engine cover by pulling it up from each side and lifting it off the mounting posts in the center. Disconnect the electrical connector from the ignition coil and remove the mounting fastener from the ignition coil. Two of the mounting fasteners have the engine cover post on top; pull the mounting post off to access the coil mounting fasteners. Grasp the coil firmly and pull it off the spark plug. Installation is the reverse of removal.

Genuine Mazda 3 Ignition Coil

Ignition Coil Resistor

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6 Ignition Coils found

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Mazda 3 Ignition Coil Part Number: LF2L-18-100A
$93.70 MSRP: $124.96
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Product Specifications
- Other Name: Coil, Ignition
- Replaces: LF2L-18-100
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2010-2013 Mazda 3 | Mazdaspeed | 4 Cyl 2.3 L GAS
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Mazda 3 Ignition Coil Part Number: L3G2-18-100B-9U
$122.51 MSRP: $163.38
You Save: $40.87 (26%)
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Product Specifications
- Other Name: Coil
- Replaces: L3G2-18-100A-9U, L3G2-18-100, L3G2-18-100B, L3K9-18-100B, L3K9-18-100A, L3G2-18-100A
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2006-2013 Mazda 3 | i, Mazdaspeed, S | 4 Cyl 2.0 L GAS, 4 Cyl 2.3 L GAS, 4 Cyl 2.5 L GAS
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Mazda 3 Ignition Coil Part Number: PX5H-18-100
$131.44 MSRP: $175.29
You Save: $43.85 (26%)
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Product Specifications
- Other Name: Coil, Ignition; Ignition Coil
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2023-2024 Mazda 3 | 2.5 S, Carbon Edition, Preferred, Premium, Select, Select Sport | 4 Cyl 2.5 L GAS
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Mazda 3 Ignition Coil Part Number: PE20-18-100A
$131.73 MSRP: $175.67
You Save: $43.94 (26%)
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Product Specifications
- Other Name: Coil, Ignition
- Replaces: P51B-18-100, PE01-18-100, PE01-18-100A, PE20-18-100
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2012-2024 Mazda 3 | 2.0, 2.5 Carbon Turbo, 2.5 S, 2.5 Turbo, 2.5 Turbo Premium Plus, Base, Carbon Edition, Grand Touring, i, i Grand Touring, I Sport, i SV, I Touring, Mazdaspeed, Preferred, Premium, S, s Grand Touring, s Touring, Select, Sport, Touring | 4 Cyl 2.0 L GAS, 4 Cyl 2.3 L GAS, 4 Cyl 2.5 L GAS
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Mazda 3 Ignition Coil Part Number: PYFS-18-100
$147.51 MSRP: $196.73
You Save: $49.22 (26%)
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Product Specifications
- Other Name: Coil, Ignition; Ignition Coil
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2019-2023 Mazda 3 | 2.0, 2.5 S, 2.5 Turbo, 2.5 Turbo Premium Plus, Base, Carbon Edition, Preferred, Premium, Select | 4 Cyl 2.0 L GAS, 4 Cyl 2.5 L GAS
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Mazda 3 Ignition Coil Part Number: ZZCA-18-100
$118.94 MSRP: $158.61
You Save: $39.67 (26%)
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Product Specifications
- Other Name: Coil, Ignition; Coil
- Replaces: LF16-18-100B, LF16-18-100A, LF16-18-100
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2004-2006 Mazda 3 | i, S, SP23 | 4 Cyl 2.0 L GAS, 4 Cyl 2.3 L GAS

Mazda 3 Ignition Coil

The Mazda 3 Ignition Coil transforms the somewhat meager 12 volts of the battery into a ruthless 15,000-40,000-volt burst to allow the spark plugs to ignite fuel without any hesitation. It is a kind of transformer between the low-voltage primary circuit and the high-voltage secondary circuit whereby a pair of copper windings are wrapped around an iron core and all are enclosed in heat-resistant epoxy. As the current passes through the larger primary winding, it generates a magnetic field, and the moment the ECU interrupts the flow the collapsing field causes the charge to jump across the enormous number of thousands of turns of the smaller secondary winding and deliver energy to the plugs. Early Mazda models were based on a single distributor-fed design, and recent Mazda models have a dual-coil waste-spark design firing two cylinders per revolution with one receiving a harmless waste-spark. The new Mazda models fit a single coil on every plug, a coil-on-plug design eliminating high-tension leads, sharpening timing, and enhancing efficiency, and the same construction is applied in current generation 3 models. Insulation can be cracked by heat, vibration, or over-resistance in old wires and enlarged gaps in plugs resulting in misfires, rough idle operation, and an active warning light. Resistance can be checked with a meter or by looking at the patterns on a scope; a weakened Ignition Coil is immediately identified and replacing an open Ignition Coil will make the power and fuel economy smooth again.

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Mazda 3 Ignition Coil Parts and Q&A

Ignition Coil
LF2L-18-100A
Q: How to disconnect the ignition coil and remove the upper engine cover on Mazda 3?
A:
Disconnect the cable from the negative battery terminal. Remove the upper engine cover by pulling it up from each side and lifting it off the mounting posts in the center. Disconnect the electrical connector from the ignition coil and remove the mounting fastener from the ignition coil. Two of the mounting fasteners have the engine cover post on top; pull the mounting post off to access the coil mounting fasteners. Grasp the coil firmly and pull it off the spark plug. Installation is the reverse of removal.