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Q:

WHAT ARE SOME THE CAUSES AS TO WHY THIS MODEL CAR WILL NOT PASS EMISSIONS TEST? on 1991 Buick Riviera

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1991 BUICK RIVIERA
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Some causes are , age , mileage , and emissions faults that set codes that have not been repaired and are causing excess pollution.
Could it be it's 22 years old? There's so many things that could fail the test. Contact me at jmgrhm30@gmail.com for more help.