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Part #1 P0491 check engine light how to fix yourself Secondary AIR injection Diag VW Jetta
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Audi Fault Codes P0491 & P0492
P0491 | P0491 Secondary Air Injection System Insufficient Flow Bank | code p0491
VW Tiguan 2.0T P0491 Here’s the problem.
What is P0491 Engine Code [Quick Guide]
P0491 Explained — Secondary Air Injection System Malfunction (Bank 1) — emission control v | Trouble
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Last Updated: August 21, 2026
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