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Re: secondary air injection intermittent P0411
Posted to Technical Discussion Forum on 1/30/2018 1 Reply

Did you replace the check valves yet? I have had a couple that looked awfully clean visually and seemed to open OK in shop testing, but would set a code once a month or so. Replacing the check valve was the fix. (assuming pump wasnt flooding/failing or a relay... Login to read more.

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