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Q:

smog detector on 2001 Subaru Forester

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
85,000 miles
check engine light comes on, goes off after several days, comes on again
mechanic said it was a smog detector?
please locate this for me and offer insight into replacement
(1) Answer
There is no "smog detector". Here is background on the check engine light that will get you started on the right path to getting the problem fixed: http://repairpal.com/check-engine-light