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Q:

check engine light not working on 1990 Nissan Pickup (D21)

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
My son just bought his first vehicle which failed CA smog because the check engine light does not come on. What can we do to fix this?
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