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99 mercury cougar V6 codes are p1744 Transmission p0420 Catalyst efficiency Below threshold bank 1 po171 system too lean bank 1 and p0174 system to lean bank 2 any ideas how to fix this?
Wiki User
∙ 15y ago
Check your EGR valve or see if there are any vacuum leaks. Other than that, no special ideas.
Wiki User
∙ 15y ago
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