Every 10,000 miles or 12 months Hyundai recommends running a tank of fuel through with some sort of detergent additive.

The rest of a Fuel Injector cleaning service is probably bunk BS. The car should shout at you if it thinks one of its injectors is clogged.

 

@kc1ih that sort of BS service is for normal carbueretor engines, the Ioniq has direct injection (injectors in the cylinder head like a diesel)

 

You would note any change in `performance` as a mpg-hit which as a diligent owner you couldn't miss as your mileage would take the kind of hit you couldn't ignore, and lights would be shining bright on the dash. >

Your BS filter also doesn't need replacing!

 

This is something that servicing dealers have been foisting off on unsuspecting owners for several years. It is a complete rip off. Back in the mid 60's, the auto dealership I was working for while in college sold several cans of additives - what I called "mechanics in a can" to unsuspecting customers, when in for their regular service. The mechanics loved to do this because there was a metal disk in each can and they could get cash for turning in the disks to the additive supplier.

 

Modern gasoline has "cleansing" additives in it so an additional procedure is unnecessary. Don't blame them for trying to sell you something. They're just trying to make a buck like everyone else.

 

Unfortunately, it's not a scam. Ioniqs have GDI engines (gasoline direct injection) so the fuel doesn't wash over and clean the injectors.

Here's my PHEV engine at just 55K miles, necessitating replacement of 3 of the 4 fuel injectors under warranty. Dealer wants $305 for the cleaning service so I may try this by myself ($20 for a can): https://knowhow.napaonline.com/how-to-use-crc-gdi-intake-valve-cleaner/