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Service Engine Light Flashing Up Hill

1K views 2 replies 3 participants last post by  51008 
#1 ·
I know I have Oxygen sensor gone bad but when I go up hill now my service Engine starts flashing sometimes. Computer says spark plugs but those were changed in April. What else could it be?
 
#2 ·
I would check spark plugs. Just because they were changed in April doesn't mean they haven't gone bad.

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