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Posted

Hi, just wondering if anyone has had a problem with there twinscroll running rough and bogging at low revs? Had a code for o2 sensor bank one so I changed that and the code has gone but now and then the car still does it, it’s fine past 3k revs it’s just low revs, cleaned the maf sensor but I don’t know what else is could be starting to annoy me as it doesn’t always do it. 
any help will be appreciated 

tia

Posted

When was the last time the spark plugs/ air filter were changed and was the replacement o2 sensor a genuine Subaru part ?

Try checking for vacuum lines or intake air tract leaks , if you're not sure how to do this yourself.  Ask a garage to do a "smoke test "

As a misfire or air leak, could send unburnt fuel through the exhaust and give a o2 sensor fault .

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