How to remove the ignition coil unit with a single DIS coil on Audi A3?

To disconnect the ignition coil unit on a single DIS coil engine, make sure that the ignition has been switched off and the key has been turned out. When needed to access the engine top cover, remove the engine top cover that may have hidden accessing retaining nuts or plastic screws with a wide-bladed screwdriver. Removing the cover, pull out the main wiring plug at the base or side of the ignition coil. Original ignition leads must be labeled with 1 through 4, the 1 being at the end of the timing belt. Without markings, mark the ignition leads before removing them and either mark the terminals of the ignition coil or sketch the positions of leads to be connected at. To remove the coil unit, disconnect the ignition leads to the ignition coil terminals, unscrew the three mounting bolts and remove the coil unit. In one coil per spark plug engines, the ignition coils are to be disconnected to reach the spark plugs. Refitting is the reverse procedure that includes first fixing the coil mounting bolts firmly in place and fitting the previously mentioned marks to reconnect the ignition leads, which can be enhanced by applying a water-dispersant to each connector on the refitting.

How to disconnect and remove the ignition coil on Audi A4?

Disconnect the cable from the negative battery terminal. For four-cylinder models, remove the engine cover on 1.8L models, then take out the screws securing the wiring harness and disconnect all four connectors from the ignition coils, ensuring to depress the tabs to release them. To remove an ignition coil, grasp it firmly and pull it straight up, then apply a little silicone dielectric compound to the inside of the spark plug boot before installing the coil, with installation being the reverse of removal. For V6 models, if removing a coil from the left valve cover of a 3.0L model, first remove the left front engine compartment cover and the engine coolant reservoir; for a 3.2L model, remove the front and rear engine covers, and if working on the right valve cover, also remove the fresh air inlet duct and the air intake duct. Disconnect the electrical connectors from any components with harnesses obstructing access, then set the harnesses aside. Remove the fasteners securing the clips for the ignition coil harness, disconnect all three electrical connectors from the coils, and ensure all three connectors are disconnected to pull the harness back far enough for the coil to clear the connector. To remove an ignition coil, grasp it firmly and pull it straight up, then apply a little silicone dielectric compound to the inside of the spark plug boot before installing the coil.

Genuine Audi Ignition Coil

Ignition Coil Resistor

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28 Ignition Coils found

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Audi Ignition Coil Part Number: 079-905-110-P
$72.59 MSRP: $101.68
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Product Specifications
- Other Name: Ignit.Coil; Ignition Coil
- Replaces: 079-905-110-K, 079-905-110-L, 079-905-110-H
Fits the following Audi Models:
- A8 Quattro | 2013-2018 | Base, L, L Sport | 8 Cyl 4.0 L GAS
- RS7 | 2014 | Base | 8 Cyl 4.0 L GAS
- S6 | 2013-2018 | Base, Premium Plus, Prestige | 8 Cyl 4.0 L GAS
- S7 | 2013-2018 | Base, Premium Plus, Prestige | 8 Cyl 4.0 L GAS
- S8 | 2017-2018, 2013-2014 | Base, Plus | 8 Cyl 4.0 L GAS
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Audi Ignition Coil Part Number: 079-905-110-R
$77.35 MSRP: $108.34
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Product Specifications
- Other Name: Ignit.Coil; Ignition Coil
- Replaces: 079-905-110-N, 079-905-110-J
Fits the following Audi Models:
- A8 Quattro | 2013-2018 | Base, L, L Sport | 8 Cyl 4.0 L GAS
- RS7 | 2015-2018 | Base, Performance | 8 Cyl 4.0 L GAS
- S7 | 2015 | Base | 8 Cyl 4.0 L GAS
- S8 | 2013-2018 | Base, Plus | 8 Cyl 4.0 L GAS
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Audi Ignition Coil Part Number: 06E-905-115-G
$79.73 MSRP: $111.67
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Product Specifications
- Other Name: Ignit.Coil; Ignition Coil
- Replaces: 06E-905-115-C, 06E-905-115-F, 06E-905-115-E, 06E-905-115, 06E-905-115-A, 06E-905-115-B, 06E-905-115-D
Fits the following Audi Models:
- A4 | 2016, 2006-2008 | Base, Premium, Premium Plus | 4 Cyl 2.0 L GAS, 6 Cyl 3.2 L GAS
- A4 Quattro | 2016, 2005-2009 | Avant, Base, Cabriolet, Premium, Premium Plus | 4 Cyl 2.0 L FLEX, 4 Cyl 2.0 L GAS, 6 Cyl 3.0 L GAS, 6 Cyl 3.2 L GAS
- A5 Quattro | 2008-2010 | Base | 6 Cyl 3.2 L GAS
- A6 | 2006-2011 | Base | 6 Cyl 3.2 L GAS
- A6 Quattro | 2005-2018 | Avant, Base, Competition, Premium, Premium Plus, Prestige, Sport, TDI Premium Plus, TDI Prestige | 6 Cyl 3.0 L DIESEL, 6 Cyl 3.0 L GAS, 6 Cyl 3.2 L GAS, 8 Cyl 4.2 L GAS
- A7 Quattro | 2012-2018 | Base, Competition, Premium Plus, Prestige, TDI Premium Plus, TDI Prestige | 6 Cyl 3.0 L DIESEL, 6 Cyl 3.0 L GAS
- A8 Quattro | 2007-2018 | Base, L, L TDI | 6 Cyl 3.0 L DIESEL, 6 Cyl 3.0 L GAS, 8 Cyl 4.2 L GAS
- Q5 | 2009-2017 | Premium, Premium Plus, Prestige | 6 Cyl 3.0 L GAS, 6 Cyl 3.2 L GAS
- Q7 | 2017-2019, 2007-2015 | Base, Premium, Premium Plus, Prestige, TDI Premium, TDI Premium Plus, TDI Prestige | 6 Cyl 3.0 L DIESEL, 6 Cyl 3.0 L GAS, 6 Cyl 3.6 L GAS, 8 Cyl 4.2 L GAS
- R8 | 2014-2015, 2008-2012 | Base, GT, GT Spyder, Plus, Spyder | 10 Cyl 5.2 L GAS, 8 Cyl 4.2 L GAS
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Audi Ignition Coil Part Number: 077-905-115-T
$92.81 MSRP: $129.98
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Product Specifications
- Other Name: Ignittion Coil
- Replaces: 077-905-115-P, 077-905-115-E, 077-905-115-H, 077-905-115-Q, 077-905-115-K, 077-905-115-C, 077-905-115-F
Fits the following Audi Models:
- A6 Quattro | 2005-2006 | Base | 8 Cyl 4.2 L GAS
- A8 Quattro | 2004-2006 | Base, L | 8 Cyl 4.2 L GAS
- Allroad Quattro | 2004-2005 | Base | 8 Cyl 4.2 L GAS
- RS4 | 2007-2008 | Base | 8 Cyl 4.2 L GAS
- S4 | 2004-2009 | Avant, Base, Cabriolet | 8 Cyl 4.2 L GAS
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Audi Ignition Coil Part Number: 058-905-105
$123.75 MSRP: $173.32
You Save: $49.57 (29%)
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Product Specifications
- Other Name: Coil
Fits the following Audi Models:
- A4 | 1997-2001 | Base | 4 Cyl 1.8 L GAS, 6 Cyl 2.8 L GAS
- A4 Quattro | 1997-2001 | Avant, Base | 4 Cyl 1.8 L GAS, 6 Cyl 2.8 L GAS
- A6 Quattro | 2000-2004 | Base | 6 Cyl 2.7 L GAS
- A8 | 1997-1999 | Base | 8 Cyl 3.7 L GAS
- A8 Quattro | 1997-1999 | Base | 8 Cyl 4.2 L GAS
- Allroad Quattro | 2001-2003 | Base | 6 Cyl 2.7 L GAS
- S4 | 2000-2002 | Avant, Base | 6 Cyl 2.7 L GAS
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Audi Ignition Coil Part Number: 211-905-115-D
$135.65 MSRP: $189.98
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Product Specifications
- Other Name: Coil
Fits the following Audi Models:
- 4000 | 1985 | S | 4 Cyl 1.8 L GAS
- 4000 Quattro | 1985 | S | 5 Cyl 2.2 L GAS
- 5000 | 1985 | CS Turbo, S | 5 Cyl 2.2 L GAS
- Coupe | 1985 | Base | 5 Cyl 2.2 L GAS
- Quattro | 1985 | Base | 5 Cyl 2.2 L GAS
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Audi Ignition Coil Part Number: 078-905-101-C
$321.30 MSRP: $450.00
You Save: $128.70 (29%)
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Product Specifications
- Other Name: Coil
Fits the following Audi Models:
- A4 | 1996-1999 | Avant, Base | 6 Cyl 2.8 L GAS
- A4 Quattro | 1996-1999 | Avant, Base | 6 Cyl 2.8 L GAS
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Audi Ignition Coil Part Number: 078-905-104-A
$431.36 MSRP: $604.16
You Save: $172.80 (29%)
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Product Specifications
- Other Name: Coil
- Replaces: 078-905-104
Fits the following Audi Models:
- A4 | 1998-2001 | Avant, Base | 6 Cyl 2.8 L GAS
- A4 Quattro | 1998-2001 | Avant, Base | 6 Cyl 2.8 L GAS
- A6 | 1995-2001 | Avant, Base | 6 Cyl 2.8 L GAS
- A6 Quattro | 1995-2001 | Avant, Base | 6 Cyl 2.8 L GAS
- S6 | 1995 | Base | 5 Cyl 2.2 L GAS
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Audi Ignition Coil Part Number: 06C-905-115-M
$43.56 MSRP: $60.00
You Save: $16.44 (28%)
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Product Specifications
- Other Name: Ignittion Coil
- Replaces: 06C-905-115-L, 06C-905-115-J, 06C-905-115-E, 06C-905-115-G, 06C-905-115-F, 06C-905-115-D, 06C-905-115-K, 06C-905-115-B, 06C-905-115-H
Fits the following Audi Models:
- A4 | 2002-2005 | Base, Cabriolet | 6 Cyl 3.0 L GAS
- A4 Quattro | 2002-2006 | Avant, Base, Cabriolet | 6 Cyl 3.0 L GAS
- A6 | 2002-2004 | Base | 6 Cyl 3.0 L GAS
- A6 Quattro | 2002-2004 | Avant, Base | 6 Cyl 3.0 L GAS
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Audi Ignition Coil Part Number: 07P-905-715
$55.04 MSRP: $75.82
You Save: $20.78 (28%)
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Product Specifications
- Other Name: Ignittion Coil
- Replaced by: 07P-905-715-A
Fits the following Audi Models:
- A8 Quattro | 2012-2016 | L W12 | 12 Cyl 6.3 L GAS
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Audi Ignition Coil Part Number: 07P-905-715-A
$55.04 MSRP: $75.82
You Save: $20.78 (28%)
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Product Specifications
- Other Name: Ignit.Coil; Ignition Coil
- Replaces: 07P-905-715
Fits the following Audi Models:
- A8 Quattro | 2012-2016 | L W12 | 12 Cyl 6.3 L GAS
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Audi Ignition Coil Part Number: 022-905-715-D
$65.44 MSRP: $91.65
You Save: $26.21 (29%)
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Product Specifications
- Other Name: Ignit.Coil; Ignition Coil
- Replaces: 022-905-715-B
Fits the following Audi Models:
- A3 Quattro | 2006-2009 | Base | 4 Cyl 2.0 L GAS, 6 Cyl 3.2 L GAS
- Q7 | 2007-2009 | Base, Premium | 6 Cyl 3.6 L GAS
- TT Quattro | 2008-2009 | Base | 6 Cyl 3.2 L GAS
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Audi Ignition Coil Part Number: 07K-905-715-G
$65.44 MSRP: $91.65
You Save: $26.21 (29%)
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Product Specifications
- Other Name: Ignit.Coil; Ignition Coil
- Replaces: 06H-905-115-A, 07K-905-715-F, 06F-905-115-F, 07K-905-715-D, 06F-905-115-E, 06H-905-115-B, 06H-905-115, 07K-905-715-E
Fits the following Audi Models:
- A3 | 2006-2013 | Base, TDI | 4 Cyl 2.0 L DIESEL, 4 Cyl 2.0 L GAS
- A3 Quattro | 2009-2013 | Base | 4 Cyl 2.0 L GAS
- A4 | 2005-2016 | Base, Cabriolet, Premium, Premium Plus, Prestige | 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L GAS, 6 Cyl 3.2 L GAS
- A4 Quattro | 2005-2016 | Avant, Base, Cabriolet, Premium, Premium Plus, Prestige | 4 Cyl 2.0 L FLEX, 4 Cyl 2.0 L GAS, 6 Cyl 3.2 L GAS
- A5 | 2010-2014 | Cabriolet | 4 Cyl 2.0 L GAS
- A5 Quattro | 2010-2017 | Base, Cabriolet, Premium, Premium Plus, Prestige, Sport | 4 Cyl 2.0 L FLEX, 4 Cyl 2.0 L GAS
- A6 | 2012-2015 | Premium, Premium Plus | 4 Cyl 2.0 L GAS
- A6 Quattro | 2013-2015 | Premium, Premium Plus | 4 Cyl 2.0 L GAS
- Q3 | 2015-2018 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L GAS
- Q3 Quattro | 2015-2018 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L GAS
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Audi Ignition Coil Part Number: 04E-905-110-P
$66.63 MSRP: $93.32
You Save: $26.69 (29%)
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Product Specifications
- Other Name: Ignit.Coil; Ignition Coil
- Replaces: 04E-905-110-K, 04E-905-110-E, 04E-905-110-B
Fits the following Audi Models:
- A3 Sportback e-tron | 2016-2018 | Premium, Premium Plus, Prestige | 4 Cyl 1.4 L PLUG-IN HYBRID EV-GAS (PHEV)
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Audi Ignition Coil Part Number: 06B-905-115-E
$61.51 MSRP: $86.15
You Save: $24.64 (29%)
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Product Specifications
- Other Name: Ignittion Coil
- Replaces: 06B-905-115
Fits the following Audi Models:
- A6 Quattro | 2000-2004 | Base | 8 Cyl 4.2 L GAS
- A8 Quattro | 2000-2003 | Base, L | 8 Cyl 4.2 L GAS
- S6 | 2002-2003 | Avant | 8 Cyl 4.2 L GAS
- S8 | 2001-2003 | Base | 8 Cyl 4.2 L GAS
- TT | 2000-2002 | Base | 4 Cyl 1.8 L GAS
- TT Quattro | 2000-2002 | ALMS Edition, Base | 4 Cyl 1.8 L GAS
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Audi Ignition Coil Part Number: 06L-905-110-K
$71.39 MSRP: $99.98
You Save: $28.59 (29%)
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Product Specifications
- Other Name: Ignit.Coil; Ignition Coil
- Replaces: 06L-905-110-D, 06L-905-110-E, 06K-905-110-K, 06L-905-110-F, 06L-905-110-H, 06L-905-110-C
Fits the following Audi Models:
- A3 | 2022-2024, 2015-2016 | Premium, Premium Plus, Prestige | 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L GAS
- A3 Quattro | 2022-2023 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L GAS
- A4 | 2017-2020 | Premium, Premium Plus, Prestige, Titanium | 4 Cyl 2.0 L GAS
- A4 Quattro | 2017-2021 | Premium, Premium Plus, Prestige, Ultra sport | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
- A4 allroad | 2017-2020 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L GAS
- A5 Quattro | 2018-2023 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
- A5 Sportback | 2018-2023 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
- A6 | 2016-2018 | Premium, Premium Plus, Sport | 4 Cyl 2.0 L GAS
- A6 Quattro | 2016-2023 | Premium, Premium Plus, Sport | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
- A7 Sportback | 2021-2022 | Premium Plus, Prestige | 4 Cyl 2.0 L PLUG-IN HYBRID EV-GAS (PHEV)
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Audi Ignition Coil Part Number: 06H-905-110-P
$74.96 MSRP: $104.98
You Save: $30.02 (29%)
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Product Specifications
- Other Name: Ignit.Coil; Ignition Coil
- Replaces: 06H-905-110-G, 06J-905-110-K, 06H-905-110-L, 06J-905-110-D, 06J-905-110-F, 06J-905-110-N, 06J-905-110-E, 06K-905-110-D, 06J-905-110-G, 06H-905-110-H
Fits the following Audi Models:
- A3 | 2022-2024, 2017-2020 | Premium, Premium Plus, Prestige, Titanium | 4 Cyl 2.0 L GAS
- A3 Quattro | 2022-2023, 2015-2020 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L GAS
- A4 | 2017-2020 | Premium, Premium Plus, Prestige, Titanium | 4 Cyl 2.0 L GAS
- A4 Quattro | 2017-2023 | Premium, Premium Plus, Prestige, Ultra sport | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
- A4 allroad | 2021-2023 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
- A5 Quattro | 2021-2023 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
- A5 Sportback | 2021-2023 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
- A6 | 2012-2018 | Premium, Premium Plus, Sport | 4 Cyl 2.0 L GAS
- A6 Quattro | 2013-2023 | Premium, Premium Plus, Prestige, Sport | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV), 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV)
- A6 allroad | 2020-2023 | Premium Plus, Prestige | 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV)
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Audi Ignition Coil Part Number: 022-905-715
$15.75 MSRP: $21.00
You Save: $5.25 (25%)
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Product Specifications
- Other Name: Ignittion Coil
- Replaces: 022-905-100-T, 022-905-100-P, 022-905-100-L, 022-905-100-H, 022-905-100-E, 022-905-100-S
Fits the following Audi Models:
- A3 Quattro | 2006-2007 | Base | 6 Cyl 3.2 L GAS
- Q7 | 2007 | Base, Premium | 6 Cyl 3.6 L GAS
- TT | 2004-2006 | Base | 4 Cyl 1.8 L GAS
- TT Quattro | 2004-2006 | Base, Special Edition | 6 Cyl 3.2 L GAS
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Audi Ignition Coil Part Number: 04C-905-110-L
$24.34 MSRP: $32.45
You Save: $8.11 (25%)
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Product Specifications
- Other Name: Ignit.Coil; Ignition Coil
- Replaces: 04C-905-110-H, 04C-905-110-J, 04C-905-110-D
Fits the following Audi Models:
- A3 Sportback e-tron | 2016-2018 | Premium, Premium Plus, Prestige | 4 Cyl 1.4 L PLUG-IN HYBRID EV-GAS (PHEV)
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Audi Ignition Coil Part Number: 06A-905-115-D
$38.47 MSRP: $52.98
You Save: $14.51 (28%)
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Product Specifications
- Other Name: Ignittion Coil
- Replaces: 06B-905-115-R, 06B-905-115-J, 06B-905-115-L, 06B-905-115-H, 06B-905-115-S, 06B-905-115-Q, 06B-905-115-G, 06B-905-115-P, 06A-905-115-C
Fits the following Audi Models:
- A4 | 2001-2006 | Base, Cabriolet | 4 Cyl 1.8 L GAS
- A4 Quattro | 2001-2005 | Avant, Base | 4 Cyl 1.8 L GAS
- Allroad Quattro | 2003-2005 | Base | 6 Cyl 2.7 L GAS
- TT | 2001-2006 | Base | 4 Cyl 1.8 L GAS
- TT Quattro | 2001-2006 | Base | 4 Cyl 1.8 L GAS
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Audi Ignition Coil

The Audi Ignition Coil converts the battery's relatively low 12 volts into a high voltage surge that causes each spark plug to go off with precision, giving the engine instant life. Audi began in 1909 and quickly built a reputation for sleek sedans and capable SUVs that balance sporty handling with everyday comfort, reinforced by the legendary Quattro all-wheel drive applied to ensure the car maintains steady traction in rain-soaked or snowy roads. Audi also presses the digital convenience button, equipping cars with clear Virtual Cockpit screens and adaptive matrix headlights that light up curves without blinding oncoming traffic, and the e-tron line indicates the brand's ambition for electric vehicles and the self-driving prototypes they're testing for the future. Behind every start, cruise, and spirited sprint is the unheard Ignition Coil silently supporting performance. Modern engines have an Ignition Coil atop each spark plug, so that the path of energy is shorter, the losses are lower, and the control unit can time each flash to have cleaner combustion. This compact design leads to fewer misfires, smoother idle, and it helps fuel economy; this isn't limited to one model, but for the whole lineup. Built with epoxy-sealed windings and an iron core, each Ignition Coil is impervious to the heat and vibration common in an engine bay, to keep converting voltages reliably mile after mile so that every Audi is eager whenever the driver presses the accelerator.

Stick with genuine OEM Ignition Coil when you need quality that holds up. Audi crafts these parts to hit strict factory specs for every single unit. They also run each part through rigorous checks during production to maintain high quality. You can find exact Audi Ignition Coil you need in our huge stock at AudiPartsGiant.com. You'll love our low, economical prices too. Every OEM part carries a real manufacturer's warranty, so you can buy with confidence. Returns aren't a headache here because our policy is simple. Plus, our speedy delivery gets orders out fast. Shop today and buy with total peace of mind.

Audi Ignition Coil Parts and Q&A

Ignition Coil
06H-905-110-P
Q: How to remove the ignition coil unit with a single DIS coil on Audi A3?
A:
To disconnect the ignition coil unit on a single DIS coil engine, make sure that the ignition has been switched off and the key has been turned out. When needed to access the engine top cover, remove the engine top cover that may have hidden accessing retaining nuts or plastic screws with a wide-bladed screwdriver. Removing the cover, pull out the main wiring plug at the base or side of the ignition coil. Original ignition leads must be labeled with 1 through 4, the 1 being at the end of the timing belt. Without markings, mark the ignition leads before removing them and either mark the terminals of the ignition coil or sketch the positions of leads to be connected at. To remove the coil unit, disconnect the ignition leads to the ignition coil terminals, unscrew the three mounting bolts and remove the coil unit. In one coil per spark plug engines, the ignition coils are to be disconnected to reach the spark plugs. Refitting is the reverse procedure that includes first fixing the coil mounting bolts firmly in place and fitting the previously mentioned marks to reconnect the ignition leads, which can be enhanced by applying a water-dispersant to each connector on the refitting.
Ignition Coil
06A-905-115-D
Q: How to disconnect and remove the ignition coil on Audi A4?
A:
Disconnect the cable from the negative battery terminal. For four-cylinder models, remove the engine cover on 1.8L models, then take out the screws securing the wiring harness and disconnect all four connectors from the ignition coils, ensuring to depress the tabs to release them. To remove an ignition coil, grasp it firmly and pull it straight up, then apply a little silicone dielectric compound to the inside of the spark plug boot before installing the coil, with installation being the reverse of removal. For V6 models, if removing a coil from the left valve cover of a 3.0L model, first remove the left front engine compartment cover and the engine coolant reservoir; for a 3.2L model, remove the front and rear engine covers, and if working on the right valve cover, also remove the fresh air inlet duct and the air intake duct. Disconnect the electrical connectors from any components with harnesses obstructing access, then set the harnesses aside. Remove the fasteners securing the clips for the ignition coil harness, disconnect all three electrical connectors from the coils, and ensure all three connectors are disconnected to pull the harness back far enough for the coil to clear the connector. To remove an ignition coil, grasp it firmly and pull it straight up, then apply a little silicone dielectric compound to the inside of the spark plug boot before installing the coil.