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Failed Nox At 25 Mph
Posted to Technical Discussion Forum on 1/15/2021 22 Replies

Hi guys, I need guidance on emission why this 1985 Toyota Corolla 1.6L EFI failed nox. I already checked all the basics including the EGR valve vacuum hoses and piping. This vehicle has a new carb-approved catalytic convertor. Any advice?

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