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94 Subaru legacy boost problems / O2 sensor problems


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Hi I've been having these problems for a few weeks now and is becoming a pain when i drive up a hill i have problems with boosting it tries to go but just jutters and jumps nothing else but then works fine on a flat surface but still jumps a little any ideas whats wrong....

 

Also when going up or down a hill the check engine light comes on for the O2 Sensor and stays on does not go away I've replaced it 2 in the last weeks and dont want to keep doing this....

 

I went to my mechanic today he said its possible its over boosting but cant tell as i don't have a boost gauge installed...

 

Any ideas on both will be very helpful thanks....

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