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Q:

check engine light on - what could it be? on 1991 Mercury Topaz

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
just had oil changed and I know I need to get a tune up - could it be spark plugs/fuel/fuel filter/sensors?
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Unfortunately there are none-just the light. BTW - sorry for not responding as quick as you did! I am thinking it just needs a tune up - I got this car from my grandmother and I don't know the last time it had a tune up.