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99 Subaru Outback/check engine light flashing at 80mph+


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Hello all, I am new to Subaru, and just purchased a 1999 Subaru Outback limited, manual, with a 2.2 engine, and it has the check engine light on, for an o2 sensor, but when I am driving down the highway, and I do more than 80 mph, then the check engine light starts flashing, when I drop below 80, it stops flashing and stays on solid. Any help/suggestions will be greatly appreciated. Thanks
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Yes there was only one code, I don't remember which it was, I'm pretty sure it was the front o2 sensor. I can take it in and get code read again tomorrow. I planned on replacing the o2 sensor tomorrow as well.
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This only happens when I go over 80mph, and if I go back under 80mph, it stops blinking, and stays on solid, as it was/is. Only flashing at 80mph+ and I don't notice the engine feel any difference either.
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the flashing cel means there is a fault which could be / is damaging the cats.

if you have a mis-fire,

and raw fuel is entering the exhaust / cats,

this could be it.

this is why a misfire causes a blinking cel.

 

but there are other causes as well.

 

read the codes,

all of them.

post the numbers,

as well as the descriptions for all of them.

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