Quantum501

I had heard the same thing and that is why I asked Viktor. His answer implied that it was more than emissions, but he may have just been siting the company line.
Either way,I am sure that they could last much longer. I will probably do them in the summer which will be around 70k. If I put it off a year, that should be fine too.

jcg0324

Lexus does not indicate a (worn) spark plug replacement mileage interval for the 4th generation. You can adopt the earlier generation benchmark of 120,000 miles if you like or just replace them as required for acceptable performance just as you would brake pads. The California emissions standard applies to 17 states and requires Lexus to warrant the plugs if they cause an emission test failure and the plugs have less than 60,000 miles (or less than 72 months). I don't believe that the plugs start to magically pollute the air after 60,000 miles.

The worst case (and very rare) scenario would be if your car is registered in CA (or one of the other 17 states that use that standard) and you fail an emission test because of faulty spark plugs: if the plugs are over 60,000 miles, you pay for the new ones which you would have had to do anyway if you changed them at 60k. Then, retake the test.
I will replace mine at 100,000 miles. A nice even number.

Check here to see if your state is one of the other 17 that has adopted the CA emissions standard: As of May 13, 2022 CARB (California Air Resources Board) lists 17 other states — New York, Massachusetts, Vermont, Maine, Pennsylvania, Connecticut, Rhode Island, Washington, Oregon, New Jersey, Maryland, Delaware, Colorado, Minnesota, Nevada, Virginia, and New Mexico — as those that have adopted California's vehicle standards under Section 177.

FlopTop04

According to the MyLexus site, my 2018 RX350 has this listing for the 60,000 mile service. This is for a U.S. registered vehicle.

FACTORY RECOMMENDED SERVICE FOR 60K MILES / 72 MONTHS
Replace Engine Oil And Oil Filter (Reset "Maint Reqd" Light If Equipped after maintenance at every 5,000 miles.)
Rotate Tires
Check Installation Of Driver's Floor Mat
Inspect Ball Joints And Dust Covers
Inspect Brake Lines And Hoses
Inspect Rear Differential Oil
Inspect Transfer Case Oil
Inspect Engine Coolant (Refer to ""Engine Coolant"" in the ""Explanation of Maintenance Items"" section of the Warranty and Maintenance Guide for more information.)
Replace Spark Plugs (Required Under Terms Of Emission Control Warranty.)
Inspect Steering Linkage And Boots
Replace Engine Air Filter
Inspect Exhaust Pipes And Mountings
Replace Cabin Air Filter (If Equipped)
Inspect Drive Belts (Initial inspection at 60,000 miles/72 months. Inspect every 15,000 miles/18 months thereafter.)
Inspect Fuel Lines And Connections, Fuel Tank Band And Fuel Tank Vapor Vent System Hoses
Inspect Fuel Tank Cap Gasket
Replace Brake Fluid
Reset Oil Maintenance Reminder, if Oil was Changed
Replace Smart Key Battery
Inspect Axle Shaft Boots
Perform Road-Test on Vehicle
Inspect Body/Chassis
Inspect Brake Rotor Thickness and Runout
Inspect Wiper Blades
Visually Inspect Brake Pads, Calipers and Rotors
Reset Scheduled Maintenance Reminder
Inspect Rack-and-Pinion Assembly
Inspect Transmission Fluid Cooler Hoses and Connections
Add EFI Fuel Tank Additive (Hawaii and Puerto Rico only)
Torque Nuts And Bolts Of Drive Shaft
Inspect Transmission for Signs of Leakage

FlopTop04

"The worst case scenario would be if your car is registered in CA
(or one of the other 17 states that use that standard) and you fail
an emission test because of faulty spark plugs: if the plugs are over
60,000 miles, you pay for the new ones which you would have had to do
anyway if you changed them at 60k. Then, retake the test."

I would think the worst case scenario would be failing the emmision's
test with a P0420 code ( Catalyst System Efficiency Below Threshold )
error at 85,000 miles. That could mean a bad converter. If it was a
bad converter, you would think it would be covered under CARB. My
quess is that Lexus would claim that the converted failed because the
spark plugs weren't replaced at 60,000 miles as required and refuse to
pay for the repair.

Lexus wanted over $3,500 to replace a converter on my SC430 nine years
ago when I got that P0420 code. The car was over just 90,000 miles but
more than 10 years old.

ravenuer

I highly doubt the original plugs would fail at less than 120k as they seem to be ok on the Toyota V6. If you pass the emission test, how would they know if you changed the plugs or not?
If you want to change them yourself, fine. But I wouldn't pay the dealer the stupid amount they charge.

golferjack

I will replace my plugs when the car does not run properly, and that may be at 100,000 miles or 200,000. Emission standards would never drive my interval

exonw

Additional question about ignition coils - how long do they normally "last". Is it worth the $$$ to replace "at least bank1 (3 x rear coils)" during spark plug replacement @100K miles/160K kms?

The cost of each ignition coil is ~US$150/CA$200 and I was told by my dealer that to change coils together with spark plug replacement is free of charge (labor). Thoughts?

toyotaman7

I've had several Toyotas with well over 350,000 km and never had to replace ignition coil. Who is recommending the coil swap?

exonw

No one .. it was just a thought. .. thanks for your input

ravenuer

Coil and spark plug replacement is free?

exonw

Sorry .. t'was labor free of charge for the ignition coils

ravenuer

LOL! I was ready to head to your guy!

Quantum501

Just an FYI that Car Care Nut has similar videos that are still available.


So another good site to find videos and perhaps save.

itsokay

1. Electric Parking Brake EPB Release - Rear Brake Service Mode: https://www.dropbox.com/s/1k2serj6ph...0Mode.mp4?dl=0
2. Engine Coolant Drain And Fill Instructions: https://www.dropbox.com/s/v3z0m3sqq1...20350.mp4?dl=0
3. Rear Differential Fluid Replacement Instructions Every 40k: https://www.dropbox.com/s/ern8bsdopc...2040k.mp4?dl=0
4. Spark Plug Replacement Instruction: https://www.dropbox.com/s/obneahft5k...ction.mp4?dl=0
5. Transfer Case Fluid Replacement Instructions - Every 40k: https://www.dropbox.com/s/zhxfkvlta5...2040k.mp4?dl=0
6. Transmission Fluid Replacement Instructions - Every 60k https://www.dropbox.com/s/zzlgsibon9...2060k.mp4?dl=0

scottford

Can someone please share a DIY to change the spark plugs on my 2016 RX350?
Any help is greatly appreciated