Question about 2002 Volvo S60

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Check engine light on. had mistakenly filled w/87

'02 s60 14k miles check engine light on. had mistakenly filled w/87 octane, refilled with 93 and then the check engine light came on. what needs to be done?

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Different octane fuel should have no real or lasting effect on your car except perhaps a bit of slight detonation. (computer will normally compensate for this by retarding timing a bit. Since you added higher octane fuel, the mix should be slightly higher than in the beginning. To improve octane of remaining fuel you could add 3oz of acetone to each 10 gallons of remaining fuel, or drive it and keep adding 93 every time you use up a quarter tank.
I think that you may not be having a problem with the fuel itself but may have an improperly sealing fuel cap. That would turn the light on.

Posted on Jun 21, 2009

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Posted on Jan 02, 2017

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