What size socket do I need to replace them? Is it 5/8"?

I was able to use a 5/8” spark plug socket.

Are this good spark plugs for 2014 lexus es300h?

Check the Denso website for fitment information

Do these double Iridium Spark plugs need gapping ?

It doesn't hurt to check gap with gap gauge, but mine were properly adjusted and didn't need to be gapped. FYI...I replaced them at 77,000 miles on my Hyundai Tuscon, but the Service Dept said they can go to 110,000 miles.

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Denso (4703) IKH16TT Iridium TT Spark Plug, (Pack of 1)

Product ID: 313962185

Details

Brand
Denso
Core material
Iridium
Thread size
14 millimeters
Top material type
iridium
Vehicle service type
Car

⚡0.4mm iridium center electrode - max spark power

⛽Larger spark - superior fuel economy

🔥0.7mm platinum ground electrode - enhanced durability

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Description

⚡ Ignite your ride with precision power and fuel-smart performance!

POWER BOOSTED FUEL SAVINGS - Larger spark size translates directly to more power and improved fuel economy—drive smarter, not harder.
PRECISION IGNITION MASTERY - World’s smallest 0.4mm iridium electrode maximizes firing potential for unmatched engine performance.
DURABILITY MEETS EFFICIENCY - 0.7mm platinum ground electrode ensures long-lasting spark consistency and reliability.
TAILORED FIT FOR PEAK PERFORMANCE - Vehicle-specific design guarantees seamless integration and optimal combustion in motorcycles and select cars.
TRUSTED BY PROS LOVED BY DRIVERS - Denso’s premium craftsmanship with a 4.7-star rating from 267+ users ensures you’re joining a community of performance enthusiasts.

The Denso IKH16TT Iridium TT Spark Plug features a groundbreaking 0.4mm iridium center electrode—the smallest in the world—paired with a durable 0.7mm platinum ground electrode. This combination delivers a larger, more efficient spark that enhances engine power and fuel economy. Designed for vehicle-specific fitment, it’s a top choice for motorcycles and select cars, backed by high customer ratings and trusted Denso quality.

Specifications

ASIN	B00TPU8Z3U
Automotive Fit Type	Vehicle Specific Fit
Best Sellers Rank	#228,009 in Automotive ( See Top 100 in Automotive ) #1,633 in Automotive Performance Spark Plugs
Brand Name	Denso
Compatible with Vehicle Type	Car
Core Material	Iridium
Country of Publication	USA
Customer Reviews	4.6 4.6 out of 5 stars (274)
Gap Size	1 Millimeters
Global Trade Identification Number	00042511047037
Included Components	Spark Plug
Item Type Name	Spark Plug
Item Weight	0.09 Pounds
Manufacturer	Denso
Manufacturer Part Number	4703
Model Number	IKH16TT
Number of Items	1
Number of Packs	1
OEM Equivalent Part Number	09482-00605-SUZUKI,18840-11051-HYUNDAI,18841-11051-HYUNDAI,18845-11160-HYUNDAI,22401-5M014-NISSAN,22401-5M015-NISSAN,22401-8H515-NISSAN,22401-AU015-NISSAN,22401-AX015-NISSAN,22401-BC01B-NISSAN,22401-ZE01B-NISSAN,5960 53-CITROËN/PEUGEOT,5960 54-CITROËN/PEUGEOT,5960 57-CITROËN/PEUGEOT,5960 58-CITROËN/PEUGEOT,5960 91-CITROËN/PEUGEOT,5960 97-CITROËN/PEUGEOT,5960 E3-CITROËN/PEUGEOT,5960 F2-CITROËN/PEUG…
Thread Size	14 millimeters
Top Material Type	iridium
UPC	042511047037
Unit Count	1 Count

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$87.93

Duties & taxes included

In stock

Sold byAmazon EcuadorDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Ecuador.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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