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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > F30 DIYs and Coding Discussions > S858A - Engine settings for low-quality fuel
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      10-17-2021, 05:43 AM   #1
KarimS
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S858A - Engine settings for low-quality fuel

Hi,
I have an F36 purchased from a country with low quality fuel that has this S858A code. I've shipped this car to UAE and we have 98 octane fuel here. Is it possible to get rid of this code? If I do will the low compression setting go away? any adverse effects to do this?

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      10-17-2021, 09:11 AM   #2
Billfitz
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The code indicates that it has a low compression engine. There's nothing you can do to change that without replacing the pistons.
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