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Q: WHEN EGR SERVICE IS POSSIBLE WITHOUT REPLACING EGR VALVE on 1995 Toyota Corolla

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ENGINE LIGHT IS ON FOR THREE WEEKS ONE FRIEND TRIED TO UNINSTALL AND CLEAN THE EGR VALVE AFTER HIS OWN CHECK UP BUT COULD NOT DO IT LEFT AS BEFORE BUT LIGHT WAS GONE FOR TWO DAYS IT SEEMS PROBLEM IN EGR SYSTEM WOULD SERVICE OF EGR SYSTEM WOULD BE GOOD ENOUGH FOR SYSTEM PERFORMANCE AND ENGINE LIGHT OFF
(1) Answer
Sometimes clogged EGR ports and/or dirty, non-closing valve cause the Check Engine Light being ON. Cleaning could resolve these problems.

Zee