MIL on/P0302 Misfire - 2025 Maverick 2.0 EB

[Cancunbadlands]

My truck has performed reliably on 91

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[MavStangVa]

My truck has performed reliably on 91

As it should. And mine has performed reliably on 87. But catastrophic engine damage will not occur using 87 as the manual clearly says the truck can operate on. Now some Ford vehicles the manuals say you MUST use 91 or higher.

 

[Chops]

As it should. And mine has performed reliably on 87. But catastrophic engine damage will not occur using 87 as the manual clearly says the truck can operate on. Now some Ford vehicles the manuals say you MUST use 91 or higher.

I think the Mustang 2.3 EB recommends 93 but says 91 is ok too. Not sure if 87 is prohibited.

I’ve used 87 octane for as long as I can remember. Multiple high mileage cars (200,000mi+) with no engine problems.

Now that I’m retired and a low mileage driver - I’ve become a snooty high octane roller. Hoping that the leftover gas in the fuel pump hose isn’t 87 from the previous user pshaw!

 

[MavStangVa]

I think the Mustang 2.3 EB recommends 93 but says 91 is ok too. Not sure if 87 is prohibited.

I’ve used 87 octane for as long as I can remember. Multiple high mileage cars (200,000mi+) with no engine problems.

Now that I’m retired and a low mileage driver - I’ve become a snooty high octane roller. Hoping that the leftover gas in the fuel pump hose isn’t 87 from the previous user pshaw!

If I were to tow with the Maverick, as my previous trucks with FI, I would use 93 since 91 is not available here. I'm too cheap to be snooty . But being retired and driving 8k a year instead of 35 to 40k a year or more I'm saving a fortune on gas and maintenance.

 

[RR - All the way]

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.

I appreciate this info on this Ford TBS. My vehicle has a 3/27 build via info on the door so it falls into the productions dates listed above. After reading all the discussion on this site, I am leaning to believe the problem may be poorly manufactured plugs which may have been installed during this period; hence the TBS.

I use top tier when I am close to Costco. Otherwise, I use Kroger with the discounts I get from buying my groceries there. Not too concerned either way. The 2025 has modified the injection system to include port injection as well as DI.
Unless towing, I use and will continue to use 87 octane. I do not think your problem was caused by octane levels or top tier use or lack thereof.

 

[Cancunbadlands]

I think the Mustang 2.3 EB recommends 93 but says 91 is ok too. Not sure if 87 is prohibited.

I’ve used 87 octane for as long as I can remember. Multiple high mileage cars (200,000mi+) with no engine problems.

Now that I’m retired and a low mileage driver - I’ve become a snooty high octane roller. Hoping that the leftover gas in the fuel pump hose isn’t 87 from the previous user pshaw!

How's the retirement going on!

 

[BLUEOVALRACER]

I think the Mustang 2.3 EB recommends 93 but says 91 is ok too. Not sure if 87 is prohibited.

I’ve used 87 octane for as long as I can remember. Multiple high mileage cars (200,000mi+) with no engine problems.

Now that I’m retired and a low mileage driver - I’ve become a snooty high octane roller. Hoping that the leftover gas in the fuel pump hose isn’t 87 from the previous user pshaw!

Were those cars Turbocharged that You ran 87 octane in?

 

[Chops]

Were those cars Turbocharged that You ran 87 octane in?

Good question. Nope - NA 4 bangers all. Did not care at all about performance.

The EB is my first Turbo & first vehicle where I appreciate the performance gains from the higher octanes. Top Tier 91 for my EB

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