what dose code po420a mean

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Check engine light came on said catalyst system low for any efficiency code po 420a what do i have to do to fix problem. thanks for any help

Kezorm in Bossier City LA

Jun 15, 2010

2 Replies

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user91328on Jun 15, 2010

replace the cat. only use cats that are california approved or the light will return. Roy

Kezorm

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RepairPal Certified shops can diagnose and repair your 2003 Chevrolet Impala. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.

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What are the best Chevrolet repair shops?

RepairPal Certified shops can diagnose and repair your 2003 Chevrolet Impala. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.