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Lexus GS450h Direct Ignition Coil Kits

Lexus Gs450H Direct ignition coil kits

Starting at $284.95, AutoBuffy stocks 1 direct ignition coils from Standard Ignition for the Lexus Gs450H. A direct ignition coil (also called a coil-on-plug) sits directly over each spark plug and fires it independently. When one fails, that cylinder misfires continuously, triggering a check engine light, rough idle, and real damage to the catalytic converter if ignored.

Signs your Lexus Gs450H needs a new direct ignition coil

  • Check engine light on with a stored misfire code (P030X) pointing to a specific cylinder
  • Rough, shuddering idle that worsens when the engine is cold or under load
  • Noticeable hesitation or stumble during acceleration, especially at low RPM
  • Reduced fuel economy — unburned fuel passes through when a cylinder misfires repeatedly
  • Engine surges or bucks at highway speed without a clear throttle input
  • Strong fuel smell from the exhaust caused by raw fuel entering the catalytic converter

Which direct ignition coil should you buy for your Lexus Gs450H?

The main decision is whether to replace one failed coil or the full set, and whether to choose OEM-equivalent or upgraded output. Coils on the same engine age at the same rate, so replacing all of them at once when one fails is common practice and saves labor. Match the coil design — pencil-type, square-body, or remote-mount — to your engine's specific configuration.

Single OEM-equivalent coil
Best for
One confirmed failed coil on a lower-mileage engine
What you get
Drop-in fit, matches factory output, lowest upfront cost
Full set — OEM-equivalent
Best for
High-mileage engines where remaining coils are likely near end of life
What you get
Uniform coil health across all cylinders, one labor charge covers all
Performance / high-output coil
Best for
Modified engines, forced induction, or upgraded spark plugs with wider gaps
What you get
Higher spark energy improves combustion efficiency under demanding conditions
OEM dealer coil
Best for
Vehicles still under powertrain warranty or with repeated aftermarket coil failures
What you get
Exact factory specification, longest documented service history for that platform

Direct ignition coil kits brands we stock for your Lexus Gs450H

Standard Ignition
1 option · from $284.95

Replacing direct ignition coils on a Lexus Gs450H

Easy⏱ 30 minutes to 1.5 hoursOBD-II scan tool (to confirm cylinder and clear codes)Socket set with extensionFlathead screwdriver or trim tool (for electrical connector clips)Torque wrenchDielectric grease

Disconnect the battery, unplug the coil's electrical connector, remove the single retaining bolt, and pull the coil straight up off the spark plug. Seat the new coil firmly, snug the bolt to the manufacturer's specified range — consult your service manual since specs vary by platform — and apply a small amount of dielectric grease to the plug boot interior before reinstalling. Clear any stored misfire codes after the repair and confirm with a short test drive.

Frequently asked questions

How much does it cost to replace direct ignition coils on a Lexus Gs450H?
Parts start at $284.95 per coil at AutoBuffy. DIY replacement keeps total cost close to that figure. A shop will add one to two hours of labor per coil, and replacing a full set at once reduces the total labor bill significantly compared to returning for each coil individually.
Can I drive my Lexus Gs450H with a bad ignition coil?
You can drive short distances, but you should not. A misfiring cylinder sends raw, unburned fuel into the exhaust stream, which can overheat and permanently damage the catalytic converter within a few hundred miles. Repair cost for a converter is typically far higher than a coil replacement.
How do I know which coil is bad on my Lexus Gs450H?
Read the stored OBD-II misfire code with a scan tool — a P0301 through P030X code identifies the misfiring cylinder directly. To confirm the coil is the cause and not the spark plug, swap the suspect coil with an adjacent one. If the misfire code moves to the new cylinder, the coil is faulty.
Should I replace all ignition coils at once on my Lexus Gs450H?
It is strongly recommended on high-mileage engines. Coils on the same engine share identical age, heat cycles, and vibration exposure. When one fails, the rest are statistically close behind. Replacing the full set during one labor visit costs less overall than returning for each successive failure.
How long do direct ignition coils last on a Lexus Gs450H?
Most OEM-quality coils last somewhere between 60,000 and 120,000 miles under normal conditions, though heat, oil leaks onto the coil boots, and extended plug replacement intervals can shorten that range. Engines running high-ethanol blends or boost pressure tend to wear coils faster than naturally aspirated engines on standard fuel.
Will a bad ignition coil cause my Lexus Gs450H to fail an emissions test?
Yes. A misfiring cylinder sends unburned hydrocarbons into the exhaust, which will exceed emissions limits and trigger a failure. The active check engine light alone is also grounds for automatic failure in most OBD-II emissions testing programs. Fix the coil before testing.

Shop direct ignition coil kits by year for the Lexus Gs450H

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Direct ignition coil kits for other Lexus models

Lexus ES350Lexus IS300Lexus IS350Lexus GS300Lexus RC300Lexus CT200h