{
    "lazyNodes": false,
    "abFitnotesFlag": false,
    "abCrawlReviews": false,
    "productOptionsCookie": false,
    "orderDelayFlag": false,
    "skipSessionCookie": false,
    "covidMessage": false,
    "fullTitleCookie": false,
    "nrLoggerCookie": false,
    "checkoutReviewCookie": false,
    "productOptionSeqCookie": false,
    "maintenanceFlag": false,
    "bufferETACookie": false,
    "multiShippingDiscountFlag": false,
    "newFitmentFlag": false,
    "surveyOptInFlag": false,
    "crossSellFlag": false,
    "skuMappingFlag": false,
    "paySplitCookie": false,
    "callDisableFlag": false,
    "zipPaymentFlag": "u",
    "hassleFreeReturn": false,
    "lifetimeReplacement": false,
    "cpn_off": false
}
0
0
Price Match Guarantee
60-Day Returns
Lifetime Replacement
Price Match Guarantee
60-Day Returns
Lifetime Replacement
Select your vehicle

BMW Ignition Coils

Don’t let a BMW ignition coil deteriorate to the point of causing issues like exhaust backfiring and rough idling. Protect your car’s engine and exhaust systems by replacing a faulty ignition coil with a new one from CarParts.com. We are your one-stop shop for competitively-priced ignition coils for models like the 135i, 230i, 330e, and more. Every product in our selection is designed to fit and perform like its stock counterpart. Check out our ignition coils below and shop now!
Refine by:
See All
See All

Shop Catalog

Showing 1 - 15 of 409 results
Display item:
15
30
45
Sort by:
Ignition Coil, (6 Cyl., 2.2L/2.5L/3.0L/3.2L)/(8 Cyl., 4.4L/4.6L/4.8L)/12 Cyl., 6.0L Engines, Black and Silver Coil
DriveWire
Ignition Coil, (6 Cyl., 2.2L/2.5L/3.0L/3.2L)/(8 Cyl., 4.4L/4.6L/4.8L)/12 Cyl., 6.0L Engines, Black and Silver Coil
Part Number: REPB504617
Vehicle Info Required to Guarantee Fit
$17.50
Product Details
Notes : Black and Silver CoilRecommended Use : OE ReplacementProduct Fit : Direct FitReplaces OE Number : 00042, 00044, 00124, 20438, 48888, 49021, 50283, 230154, 230546, 250170, 250221, 250274, 368059, 368212, 522050, 522053, 522190, 1788480, 1788508, 1788522, 1788533, 9212098, 9212111, 9212252, 9212259, 9212275, 92121116, 92122756, 92840986, 0221504464, 0221504465, 0221504470, 0221504800, 358000471, 2505317709, 2505424598, 2505484831, 12137594596, 12137594936, 12138616153, 12138647689, 1IC199, 26C1016, 2IGC0102, 2IGC0155, 2IGC0222, 5C1401, 5C1476, 5C1695, 5C1698, 5C1852, 5C1883, C1404, C1477Interchange Part Number : UF667, 00042, 00044, 00124, 20438, 48888, 49021, 50283, 230154, 230546, 250170, 250221, 250274, 368059, 368212, 522050, 522053, 522190, 1788480, 1788508, 1788522, 1788533, 9212098, 9212111, 9212252, 9212259, 9212275, 92121116, 92122756, 92840986, 0221504464, 0221504465, 0221504470, 0221504800, 358000471, 2505317709, 2505424598, 2505484831, 12137594596, 12137594936, 12138616153, 12138647689, 1IC199, 26C1016, 2IGC0102, 2IGC0155, 2IGC0222, 5C1401, 5C1476, 5C1695, 5C1698, 5C1852, 5C1883, C1404Warranty : 1-year DriveWire unlimited-mileage warrantyReturns Policy : 30-Day Return PolicyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Quantity Sold : Sold individually
Ignition Coils, Set of 4, (6 Cyl., 2.2L/2.5L/3.0L/3.2L)/(8 Cyl., 4.4L/4.6L/4.8L)/12 Cyl., 6.0L Engines, Black and Silver Coil
DriveWire
Ignition Coils, Set of 4, (6 Cyl., 2.2L/2.5L/3.0L/3.2L)/(8 Cyl., 4.4L/4.6L/4.8L)/12 Cyl., 6.0L Engines, Black and Silver Coil
Part Number: SET-REPB504617-4
Vehicle Info Required to Guarantee Fit
$63.99
Product Details
Notes : Black and Silver CoilComponents : (4) Ignition CoilRecommended Use : OE ReplacementProduct Fit : Direct FitReplaces OE Number : 00042, 00044, 00124, 20438, 48888, 49021, 50283, 230154, 230546, 250170, 250221, 250274, 368059, 368212, 522050, 522053, 522190, 1788480, 1788508, 1788522, 1788533, 9212098, 9212111, 9212252, 9212259, 9212275, 92121116, 92122756, 92840986, 0221504464, 0221504465, 0221504470, 0221504800, 358000471, 2505317709, 2505424598, 2505484831, 12137594596, 12137594936, 12138616153, 12138647689, 1IC199, 26C1016, 2IGC0102, 2IGC0155, 2IGC0222, 5C1401, 5C1476, 5C1695, 5C1698, 5C1852, 5C1883, C1404, C1477Interchange Part Number : 00042, 00044, 00124, 20438, 48888, 49021, 50283, 230154, 230546, 250170, 250221, 250274, 368059, 368212, 522050, 522053, 522190, 1788480, 1788508, 1788522, 1788533, 9212098, 9212111, 9212252, 9212259, 9212275, 92121116, 92122756, 92840986, 0221504464, 0221504465, 0221504470, 0221504800, 358000471, 2505317709, 2505424598, 2505484831, 12137594596, 12137594936, 12138616153, 12138647689, 1IC199, 26C1016, 2IGC0102, 2IGC0155, 2IGC0222, 5C1401, 5C1476, 5C1695, 5C1698, 5C1852, 5C1883, C1404, C1477Warranty : 1-year DriveWire unlimited-mileage warrantyReturns Policy : 30-Day Return PolicyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Quantity Sold : Set of 4
Ignition Coils, Set of 6, (6 Cyl., 2.2L/2.5L/3.0L/3.2L)/(8 Cyl., 4.4L/4.6L/4.8L)/12 Cyl., 6.0L Engines, Black and Silver Coil
DriveWire
Ignition Coils, Set of 6, (6 Cyl., 2.2L/2.5L/3.0L/3.2L)/(8 Cyl., 4.4L/4.6L/4.8L)/12 Cyl., 6.0L Engines, Black and Silver Coil
Part Number: SET-REPB504617-6
Vehicle Info Required to Guarantee Fit
$96.49
Product Details
Notes : Black and Silver CoilComponents : (6) Ignition CoilRecommended Use : OE ReplacementProduct Fit : Direct FitReplaces OE Number : 00042, 00044, 00124, 20438, 48888, 49021, 50283, 230154, 230546, 250170, 250221, 250274, 368059, 368212, 522050, 522053, 522190, 1788480, 1788508, 1788522, 1788533, 9212098, 9212111, 9212252, 9212259, 9212275, 92121116, 92122756, 92840986, 0221504464, 0221504465, 0221504470, 0221504800, 358000471, 2505317709, 2505424598, 2505484831, 12137594596, 12137594936, 12138616153, 12138647689, 1IC199, 26C1016, 2IGC0102, 2IGC0155, 2IGC0222, 5C1401, 5C1476, 5C1695, 5C1698, 5C1852, 5C1883, C1404, C1477Interchange Part Number : 00042, 00044, 00124, 20438, 48888, 49021, 50283, 230154, 230546, 250170, 250221, 250274, 368059, 368212, 522050, 522053, 522190, 1788480, 1788508, 1788522, 1788533, 9212098, 9212111, 9212252, 9212259, 9212275, 92121116, 92122756, 92840986, 0221504464, 0221504465, 0221504470, 0221504800, 358000471, 2505317709, 2505424598, 2505484831, 12137594596, 12137594936, 12138616153, 12138647689, 1IC199, 26C1016, 2IGC0102, 2IGC0155, 2IGC0222, 5C1401, 5C1476, 5C1695, 5C1698, 5C1852, 5C1883, C1404, C1477Warranty : 1-year DriveWire unlimited-mileage warrantyReturns Policy : 30-Day Return PolicyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Quantity Sold : Set of 6
Ignition Coil, (6 Cyl., 2.2L/2.5L/3.0L/3.2L)/(8 Cyl., 4.4L/4.6L/4.8L)/12 Cyl., 6.0L Engines
DriveWire
Ignition Coil, (6 Cyl., 2.2L/2.5L/3.0L/3.2L)/(8 Cyl., 4.4L/4.6L/4.8L)/12 Cyl., 6.0L Engines
Part Number: REPB504614
Vehicle Info Required to Guarantee Fit
$16.99
Product Details
Recommended Use : OE ReplacementProduct Fit : Direct FitReplaces OE Number : 00044, 20438, 522050, 1788508, 0221504470, 12137594937, 12138647689, 12137562744, 12137571643, 12137594938, 5C1695, C1638, C806, E1092, GN10328Interchange Part Number : UF592, 00044, 20438, 522050, 1788508, 0221504470, 12137594937, 12138647689, 12137562744, 12137571643, 12137594938, 5C1695, C1638, C806, E1092, GN10328Warranty : 1-year DriveWire unlimited-mileage warrantyReturns Policy : 30-Day Return PolicyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Quantity Sold : Sold individually
Ignition Coils, Set of 2, (6 Cyl., 2.2L/2.5L/3.0L/3.2L)/(8 Cyl., 4.4L/4.6L/4.8L)/12 Cyl., 6.0L Engines
DriveWire
Ignition Coils, Set of 2, (6 Cyl., 2.2L/2.5L/3.0L/3.2L)/(8 Cyl., 4.4L/4.6L/4.8L)/12 Cyl., 6.0L Engines
Part Number: SET-REPB504614-2
Vehicle Info Required to Guarantee Fit
$32.49
Product Details
Components : (2) Ignition CoilRecommended Use : OE ReplacementProduct Fit : Direct FitReplaces OE Number : 00044, 20438, 522050, 1788508, 0221504470, 12137594937, 12138647689, 12137562744, 12137571643, 12137594938, 5C1695, C1638, C806, E1092, GN10328Interchange Part Number : 00044, 20438, 522050, 1788508, 0221504470, 12137594937, 12138647689, 12137562744, 12137571643, 12137594938, 5C1695, C1638, C806, E1092, GN10328Warranty : 1-year DriveWire unlimited-mileage warrantyReturns Policy : 30-Day Return PolicyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Quantity Sold : Set of 2
Ignition Coils, Set of 4, (6 Cyl., 2.2L/2.5L/3.0L/3.2L)/(8 Cyl., 4.4L/4.6L/4.8L)/12 Cyl., 6.0L Engines
DriveWire
Ignition Coils, Set of 4, (6 Cyl., 2.2L/2.5L/3.0L/3.2L)/(8 Cyl., 4.4L/4.6L/4.8L)/12 Cyl., 6.0L Engines
Part Number: SET-REPB504614-4
Vehicle Info Required to Guarantee Fit
$64.49
Product Details
Components : (4) Ignition CoilRecommended Use : OE ReplacementProduct Fit : Direct FitReplaces OE Number : 00044, 20438, 522050, 1788508, 0221504470, 12137594937, 12138647689, 12137562744, 12137571643, 12137594938, 5C1695, C1638, C806, E1092, GN10328Interchange Part Number : 00044, 20438, 522050, 1788508, 0221504470, 12137594937, 12138647689, 12137562744, 12137571643, 12137594938, 5C1695, C1638, C806, E1092, GN10328Warranty : 1-year DriveWire unlimited-mileage warrantyReturns Policy : 30-Day Return PolicyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Quantity Sold : Set of 4
Ignition Coils, Set of 6, (6 Cyl., 2.2L/2.5L/3.0L/3.2L)/(8 Cyl., 4.4L/4.6L/4.8L)/12 Cyl., 6.0L Engines
DriveWire
Ignition Coils, Set of 6, (6 Cyl., 2.2L/2.5L/3.0L/3.2L)/(8 Cyl., 4.4L/4.6L/4.8L)/12 Cyl., 6.0L Engines
Part Number: SET-REPB504614-6
Vehicle Info Required to Guarantee Fit
$96.99
Product Details
Components : (6) Ignition CoilRecommended Use : OE ReplacementProduct Fit : Direct FitReplaces OE Number : 00044, 20438, 522050, 1788508, 0221504470, 12137594937, 12138647689, 12137562744, 12137571643, 12137594938, 5C1695, C1638, C806, E1092, GN10328Interchange Part Number : 00044, 20438, 522050, 1788508, 0221504470, 12137594937, 12138647689, 12137562744, 12137571643, 12137594938, 5C1695, C1638, C806, E1092, GN10328Warranty : 1-year DriveWire unlimited-mileage warrantyReturns Policy : 30-Day Return PolicyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Quantity Sold : Set of 6
Ignition Coils, Set of 8, (6 Cyl., 2.2L/2.5L/3.0L/3.2L)/(8 Cyl., 4.4L/4.6L/4.8L)/12 Cyl., 6.0L Engines
DriveWire
Ignition Coils, Set of 8, (6 Cyl., 2.2L/2.5L/3.0L/3.2L)/(8 Cyl., 4.4L/4.6L/4.8L)/12 Cyl., 6.0L Engines
Part Number: SET-REPB504614-8
Vehicle Info Required to Guarantee Fit
$128.99
Product Details
Components : (8) Ignition CoilRecommended Use : OE ReplacementProduct Fit : Direct FitReplaces OE Number : 00044, 20438, 522050, 1788508, 0221504470, 12137594937, 12138647689, 12137562744, 12137571643, 12137594938, 5C1695, C1638, C806, E1092, GN10328Interchange Part Number : 00044, 20438, 522050, 1788508, 0221504470, 12137594937, 12138647689, 12137562744, 12137571643, 12137594938, 5C1695, C1638, C806, E1092, GN10328Warranty : 1-year DriveWire unlimited-mileage warrantyReturns Policy : 30-Day Return PolicyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Quantity Sold : Set of 8
Ignition Coils, Set of 12, (6 Cyl., 2.2L/2.5L/3.0L/3.2L)/(8 Cyl., 4.4L/4.6L/4.8L)/12 Cyl., 6.0L Engines
DriveWire
Ignition Coils, Set of 12, (6 Cyl., 2.2L/2.5L/3.0L/3.2L)/(8 Cyl., 4.4L/4.6L/4.8L)/12 Cyl., 6.0L Engines
Part Number: SET-REPB504614-12
Vehicle Info Required to Guarantee Fit
$193.49
Product Details
Components : (12) Ignition CoilRecommended Use : OE ReplacementProduct Fit : Direct FitReplaces OE Number : 00044, 20438, 522050, 1788508, 0221504470, 12137594937, 12138647689, 12137562744, 12137571643, 12137594938, 5C1695, C1638, C806, E1092, GN10328Interchange Part Number : 00044, 20438, 522050, 1788508, 0221504470, 12137594937, 12138647689, 12137562744, 12137571643, 12137594938, 5C1695, C1638, C806, E1092, GN10328Warranty : 1-year DriveWire unlimited-mileage warrantyReturns Policy : 30-Day Return PolicyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Quantity Sold : Set of 12
Ignition Coil, 6 Cyl., 2.5L/3.0L Engines, Rectangular Connector Shape
DriveWire
Ignition Coil, 6 Cyl., 2.5L/3.0L Engines, Rectangular Connector Shape
Part Number: REPB504613
Vehicle Info Required to Guarantee Fit
$17.49
Product Details
Notes : Rectangular Connector ShapeRecommended Use : OE ReplacementProduct Fit : Direct FitReplaces OE Number : 12137599219Interchange Part Number : UF300, 12137599219Warranty : 1-year DriveWire unlimited-mileage warrantyReturns Policy : 30-Day Return PolicyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Quantity Sold : Sold individually
Ignition Coils, Set of 4, 6 Cyl., 2.5L/3.0L Engines, Rectangular Connector Shape
DriveWire
Ignition Coils, Set of 4, 6 Cyl., 2.5L/3.0L Engines, Rectangular Connector Shape
Part Number: SET-REPB504613-4
Vehicle Info Required to Guarantee Fit
$63.99
Product Details
Notes : Rectangular Connector ShapeComponents : (4) Ignition CoilRecommended Use : OE ReplacementProduct Fit : Direct FitReplaces OE Number : 12137599219Interchange Part Number : 12137599219Warranty : 1-year DriveWire unlimited-mileage warrantyReturns Policy : 30-Day Return PolicyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Quantity Sold : Set of 4
Ignition Coils, Set of 6, 6 Cyl., 2.5L/3.0L Engines, Rectangular Connector Shape
DriveWire
Ignition Coils, Set of 6, 6 Cyl., 2.5L/3.0L Engines, Rectangular Connector Shape
Part Number: SET-REPB504613-6
Vehicle Info Required to Guarantee Fit
$96.99
Product Details
Notes : Rectangular Connector ShapeComponents : (6) Ignition CoilRecommended Use : OE ReplacementProduct Fit : Direct FitReplaces OE Number : 12137599219Interchange Part Number : 12137599219Warranty : 1-year DriveWire unlimited-mileage warrantyReturns Policy : 30-Day Return PolicyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Quantity Sold : Set of 6
Ignition Coils, Set of 8, 6 Cyl., 2.5L/3.0L Engines, Rectangular Connector Shape
DriveWire
Ignition Coils, Set of 8, 6 Cyl., 2.5L/3.0L Engines, Rectangular Connector Shape
Part Number: SET-REPB504613-8
Vehicle Info Required to Guarantee Fit
$129.49
Product Details
Notes : Rectangular Connector ShapeComponents : (8) Ignition CoilRecommended Use : OE ReplacementProduct Fit : Direct FitReplaces OE Number : 12137599219Interchange Part Number : 12137599219Warranty : 1-year DriveWire unlimited-mileage warrantyReturns Policy : 30-Day Return PolicyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Quantity Sold : Set of 8
Ignition Coils, Set of 12, 6 Cyl., 2.5L/3.0L Engines, Rectangular Connector Shape
DriveWire
Ignition Coils, Set of 12, 6 Cyl., 2.5L/3.0L Engines, Rectangular Connector Shape
Part Number: SET-REPB504613-12
Vehicle Info Required to Guarantee Fit
$193.99
Product Details
Notes : Rectangular Connector ShapeComponents : (12) Ignition CoilRecommended Use : OE ReplacementProduct Fit : Direct FitReplaces OE Number : 12137599219Interchange Part Number : 12137599219Warranty : 1-year DriveWire unlimited-mileage warrantyReturns Policy : 30-Day Return PolicyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Quantity Sold : Set of 12
Ignition Coil, (6 Cyl., 2.2L/2.5L/3.0L/3.2L)/(8 Cyl., 4.4L/4.6L/4.8L)/12 Cyl., 6.0L Engines, Triangular Connector Shape
DriveWire
Ignition Coil, (6 Cyl., 2.2L/2.5L/3.0L/3.2L)/(8 Cyl., 4.4L/4.6L/4.8L)/12 Cyl., 6.0L Engines, Triangular Connector Shape
Part Number: REPB504605
Vehicle Info Required to Guarantee Fit
$14.00
Product Details
Notes : Triangular Connector ShapeRecommended Use : OE ReplacementProduct Fit : Direct FitReplaces OE Number : 12131712219Interchange Part Number : UF522, 12131712219Warranty : 1-year DriveWire unlimited-mileage warrantyReturns Policy : 30-Day Return PolicyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Quantity Sold : Sold individually
Page 1 of 28 | Showing 1 - 15 of 409 results

Top Rated Products

DriveWire Ignition Coil, Sold individually
$17.49( Review)
Perfect fit and fixed the issue
Lori L.
VERIFIED PURCHASER
DriveWire Ignition Coils, Black and Silver Coil
$63.99( Review)
Worked as good as the original. Easy install.
Mike M.
VERIFIED PURCHASER
DriveWire Ignition Coil, Set of 6
$96.99( Review)
Work very well
Daljit T.
VERIFIED PURCHASER

Product Questions & Answers

DriveWire Ignition Coils, Set of 8, 6 Cyl., 2.5L/3.0L Engines, Rectangular Connector Shape
$129.49
Q:Do these come with the bolts?
Bryan C.
A:BEST ANSWERHi Bryan, thank you for reaching out. No, this kit does not come with mounting hardware. You can reuse the old bolts. Click the link below to order the set before the sale ends. Have a good one! https://www.carparts.com/ignition-coil/drivewire/set-repb504613-8?can=cpab2020_csqa_20231017 Show less
Andrew B.
 
1 Question, 1 AnswerView all Q&As >

Helpful Automotive Resources

P0354 Code: Ignition Coil “D” Primary/Secondary Circuit
P0354 Code: Ignition Coil “D” Primary/Secondary CircuitDiagnostic trouble code (DTC) P0354 stands for “Ignition Coil ‘D’ Circuit Malfunction.” It indicates that the PCM has detected a problem either in the primary or secondary circuit for ignition coil “D”. Typically, when a cylinder is referenced using letters of the alphabet this way, “A” is cylinder 1,
P0316 Code: Engine Misfire Detected on Startup (First 1000 Revolutions)
P0316 Code: Engine Misfire Detected on Startup (First 1000 Revolutions)This code may be accompanied by some drivability issues, so you’ll need to figure out what’s causing it so you can fix it as soon as possible. If one of your engine’s cylinders misfire during the engine’s first 1,000 revolutions, it may trigger code P0136. What Does the P0316 Code Mean?
What Is A Coil Pack?
What Is A Coil Pack?Once the coil pack fails, engine misfiring can happen because one or more spark plugs in the engine cylinders didn’t receive enough voltage. What are the common symptoms of a faulty coil pack?