MIL on/P0302 Misfire - 2025 Maverick 2.0 EB

[Chops]

Sorry. No way you should have to run gas above 87 octane. You get a truck with engine that should give you better mileage and save money then pay more for high octane “top tier” gas.
I’m guessing a modified exhaust is more likely a problem. I don’t go on othe vehicle forums but seems like a lot of Mav owners seem to think they must immediately do everything they can to improve performance. Why? If your little truck isn’t powerful enough for you taste get a truck the comes stock with better performance.

Top Tier Gas is not for performance - it is for cleanliness. The detergents in Top Tier will help keep your fuel system cleaner - especially the all important injectors.

Do you wash your clothes to run faster? Nope - You wash them so you don’t stink. (No offense if you don’t use clothes detergent either…plain water will work just fine actually).

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[Cancunbadlands]

No, not a word. He did ask if I "had tuned it." Nothing about the exhaust system.

That's great! I got a Borla Pro XS

 

[Cherokee]

No, not a word. He did ask if I "had tuned it." Nothing about the exhaust system.

They wouldn’t need to ask, they’d know soon after they hooked up to your truck.

 

[BLUEOVALRACER]

Yes, I agree with you that an exhaust leak could cause a lean condition, if the fuel system couldn't compensate enough. However, the exhaust system I have is a post cat type system. It's been on the vehicle since almost new (700mi) and I've not had any issues up till now.

Also, I would have thought that any fueling condition, rich or lean, that would be severe enough to melt plugs, etc would have triggered a bunch of fault codes? In Toyota EFI systems, anytime Long Fuel Trim went + or - greater than 20%, it would light up the MIL/CEL. Ford might be different...but, I thought the basic parameters needed to be met by all manufacturers?

As for the valves, rings, pistons, etc. Well, yeah I would be concerned about this also...I guess we'll see?

IMO, If I were You I would have a compression check done on all the cylinders and see if 2 and 4 are lower than 1 and 3!!

 

[Cherokee]

IMO, If I were You I would have a compression check done on all the cylinders and see if 2 and 4 are lower than 1 and 3!!

At’ud be a good start, then scope the cylinders.

 

[MavStangVa]

I don’t mean to be a dick - but Sunoco is not Top Tier gas. Ford recommends Top Tier.

As a fellow owner of a 25 EB, I appreciate your explanations of this ongoing situation.

Well you need to tell Top Tier to take Sunoco off the list then. I just checked it and it is listed.
https://www.toptiergas.com/gasoline-brands/

 

[Chops]

Well you need to tell Top Tier to take Sunoco off the list then. I just checked it and it is listed.
https://www.toptiergas.com/gasoline-brands/

What was I thinking - Sunoco is indeed Top Tier. If they had a station out here I would get a fill up as penance! Thanks for the correction.

 

[john21161]

UPDATE: April 28, 2026 approx. 16200 miles

AS of today, the truck has been operating normally and no re-occurrence of any of my previous driveabilty/MIL issues.

However, I stumbled onto something interesting today, when I updated my AllData account and added my 2025 Maverick AWD-EB: I found a TSB from FORD. Something called a "Harvest Program" 25H03 looking for spark plugs from various 2025 Eco-Boost vehicles, including the Maverick. The effected production dates for Mavericks are 4/11/25 to 5/27/25. (My vehicle was produced the week of 4/21.) The Harvest Program ran from 8/28/25 to 2/28/26.

The reason given:
"Ford Product Development (PD) is conducting a harvest program among selected vehicles to examine spark plugs on engines with high levels of pre-ignition. Using connected vehicle data, PD will select up to 500 vehicles exhibiting this condition. The customers will be contacted via an owner letter and requested to visit their dealer for a spark plug replacement. They may, or may not, have a Malfunction Indicator Lamp (MIL) and may not exhibit any outward misfire or drivability concerns. Replacing the specified spark plug may prevent future Diagnostic Trouble Codes (DTCs) and possible engine damage."

I'm not familiar with FMC technical/warranty jargon, so I'm guessing here...but, it sounds like Ford was looking for failed spark plugs from "engines with high levels of pre-ignition," that exhibited driveability issues and check engine lights. It doesn't say whether the plugs or the engine tuning is responsible for the failures...but, high levels of pre-ignition doesn't sound good. However, the fact that they only replaced the spark plugs on a certain number of engines produced during a certain time, leads me to believe that they had reason to suspect the issue lay with the spark plugs and not with the EB engine or it's programing.

Other than this, I've got no new info. I'm hoping that a bad batch of plugs was the root cause of my original problems. We'll just leave it there. The effected number of 2025 trucks is relatively small and farely early in production. If your Maverick was made before 4/10 or after 5/28, you're probably ok.

I'll update, if anything new come up. Thanks.

 

[BLUEOVALRACER]

UPDATE: April 28, 2026 approx. 16200 miles

AS of today, the truck has been operating normally and no re-occurrence of any of my previous driveabilty/MIL issues.

However, I stumbled onto something interesting today, when I updated my AllData account and added my 2025 Maverick AWD-EB: I found a TSB from FORD. Something called a "Harvest Program" 25H03 looking for spark plugs from various 2025 Eco-Boost vehicles, including the Maverick. The effected production dates for Mavericks are 4/11/25 to 5/27/25. (My vehicle was produced the week of 4/21.) The Harvest Program ran from 8/28/25 to 2/28/26.

The reason given:
"Ford Product Development (PD) is conducting a harvest program among selected vehicles to examine spark plugs on engines with high levels of pre-ignition. Using connected vehicle data, PD will select up to 500 vehicles exhibiting this condition. The customers will be contacted via an owner letter and requested to visit their dealer for a spark plug replacement. They may, or may not, have a Malfunction Indicator Lamp (MIL) and may not exhibit any outward misfire or drivability concerns. Replacing the specified spark plug may prevent future Diagnostic Trouble Codes (DTCs) and possible engine damage."

I'm not familiar with FMC technical/warranty jargon, so I'm guessing here...but, it sounds like Ford was looking for failed spark plugs from "engines with high levels of pre-ignition," that exhibited driveability issues and check engine lights. It doesn't say whether the plugs or the engine tuning is responsible for the failures...but, high levels of pre-ignition doesn't sound good. However, the fact that they only replaced the spark plugs on a certain number of engines produced during a certain time, leads me to believe that they had reason to suspect the issue lay with the spark plugs and not with the EB engine or it's programing.

Other than this, I've got no new info. I'm hoping that a bad batch of plugs was the root cause of my original problems. We'll just leave it there. The effected number of 2025 trucks is relatively small and farely early in production. If your Maverick was made before 4/10 or after 5/28, you're probably ok.

I'll update, if anything new come up. Thanks.

Thanks for the information!! Good to hear Your Maverick is operating normally again!! My Maverick was built in Jan of 2025

 

[Cancunbadlands]

My local Ford Dealer recommended and ordered my Borla X-Type catback for me. They were not honoring a 20% Ford discount on the Ford Performance Exhaust & suggested the less expensive Borla. Anyway, I picked it up at the dealer & installed myself.

Ford does not care what you install behind the CATS…they don’t even offer any type of warranty coverage on their OEM pipes behind the CATS.

Good to know!

 

[Quest]

UPDATE: April 28, 2026 approx. 16200 miles

AS of today, the truck has been operating normally and no re-occurrence of any of my previous driveabilty/MIL issues.

However, I stumbled onto something interesting today, when I updated my AllData account and added my 2025 Maverick AWD-EB: I found a TSB from FORD. Something called a "Harvest Program" 25H03 looking for spark plugs from various 2025 Eco-Boost vehicles, including the Maverick. The effected production dates for Mavericks are 4/11/25 to 5/27/25. (My vehicle was produced the week of 4/21.) The Harvest Program ran from 8/28/25 to 2/28/26.

The reason given:
"Ford Product Development (PD) is conducting a harvest program among selected vehicles to examine spark plugs on engines with high levels of pre-ignition. Using connected vehicle data, PD will select up to 500 vehicles exhibiting this condition. The customers will be contacted via an owner letter and requested to visit their dealer for a spark plug replacement. They may, or may not, have a Malfunction Indicator Lamp (MIL) and may not exhibit any outward misfire or drivability concerns. Replacing the specified spark plug may prevent future Diagnostic Trouble Codes (DTCs) and possible engine damage."

I'm not familiar with FMC technical/warranty jargon, so I'm guessing here...but, it sounds like Ford was looking for failed spark plugs from "engines with high levels of pre-ignition," that exhibited driveability issues and check engine lights. It doesn't say whether the plugs or the engine tuning is responsible for the failures...but, high levels of pre-ignition doesn't sound good. However, the fact that they only replaced the spark plugs on a certain number of engines produced during a certain time, leads me to believe that they had reason to suspect the issue lay with the spark plugs and not with the EB engine or it's programing.

Other than this, I've got no new info. I'm hoping that a bad batch of plugs was the root cause of my original problems. We'll just leave it there. The effected number of 2025 trucks is relatively small and farely early in production. If your Maverick was made before 4/10 or after 5/28, you're probably ok.

I'll update, if anything new come up. Thanks.

Their getting a higher % of warranty claims with spark plug issues in those date ranges & are fishing for more data
As they get more data the date ranges may be expanded & a TSB may be issued

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