KacuYelin Iridium Spark Plugs Set of 4 — 4469 LFR5AIX-11 Compatible with 2.5L Toyota/Nissan, Long-Life

KacuYelin Iridium Spark Plugs 4469 are a set of four high-durability iridium ignition plugs designed to replace OE LFR5AIX-11 style spark plugs in many 2.4–2.7L and 2.5L engines.

These KacuYelin plugs are engineered as direct-fit replacements for a wide range of late-model Toyotas, Nissans, Kias, Hyundais, Jeeps and other makes where the OE reference numbers like 4469, LFR5AIX-11 and similar are specified. Manufactured in TS16949-certified facilities, the plugs use an iridium-tipped center electrode for consistent spark delivery, extended life and improved ignition stability across idle and high-RPM conditions. Before purchasing, verify fit with your vehicle’s thread size and heat range to ensure correct installation.

Will these plugs fit my vehicle?

Compatibility covers many models with 2.4–2.7L and 2.5L engines; examples include Toyota Camry (2010–2017 2.5L), RAV4 (2009–2018 2.5L), Highlander (2009–2019 2.7L), Scion tC (2011–2016 2.5L), Nissan Altima (2002–2006 2.5L) and Sentra variants. Use the manufacturer’s fit tool or compare the OE reference numbers and thread specifications to be certain.

• Matches OE references: 4469, LFR5AIX-11 and equivalent part numbers.
• Suitable for many Toyota, Nissan, Kia, Hyundai, Jeep, Suzuki and Fiat/Chrysler models listed in product details.
• Confirm thread length, hex size and heat range before installing.

How do these iridium plugs affect engine performance?

Iridium electrodes offer a smaller, more durable tip than standard nickel plugs, delivering a concentrated spark that helps with consistent combustion and longer service life. They won’t cure mechanical or fuel system faults, but they help reduce misfires and support smoother idling when installed correctly.

• Iridium tip for stable spark and longer replacement intervals.
• Designed to reduce misfire and irregular idling when used in compatible engines.
• Can help maintain fuel efficiency by stabilizing ignition timing and combustion.

What should I check before buying and installing these plugs?

Always verify fitment using a reliable fit tool or by matching the old plug’s thread length, seat type and heat range to the new plug. Incorrect thread size or an unsuitable heat range can damage the engine or cause poor running.

• Use the "amazonconfirmedfit" or OEM fit tool to confirm compatibility.
• Compare heat range and electrode shape to the original plug—difference should be minimal.
• Clean the spark plug hole, hand-start threads, and torque to vehicle manual specs during installation.

How durable and reliable are KacuYelin plugs?

KacuYelin builds these plugs in TS16949-certified factories and subjects them to quality testing aimed at addressing common ignition issues like misfire, surging and rough idle. The iridium construction and manufacturing controls are intended to provide predictable high-voltage output throughout the engine’s operating range.

• Produced in certified facilities with R&D and quality inspections.
• Designed to handle common ignition symptoms when used in compatible engines.
• Sold as a set of four, referencing multiple OEM numbers for cross-compatibility.

Who is this for: Drivers and home mechanics seeking a long-life, OEM-style iridium replacement for vehicles that call for LFR5AIX-11 or equivalent spark plugs—especially owners of Toyota Camry, RAV4, Highlander, Venza, Scion tC and certain Nissan, Kia, Hyundai and Jeep models who want a durable, precision spark plug from a manufacturer with certified production and product support. If you’re unsure about fit or heat range, compare your old plug to the new one or consult a mechanic before installation.