Hey everyone, picked up my first A4 a few months back. A '13 2.0T 6mt with 30k on it. Of course I couldn't keep myself from doing a few mods so I put on a 034 Motorsport high flow cat and spacer. Within a half hour of driving it the check engine came on with P013E, P013F and P013B. Added the roc-euro spacer and still came back. Went Unitronic stage 2 and that didn't take care of it. Replaced the rear 02 sensor yesterday. The P013F and P013B codes went away, the P013E stayed and invited P013A to the party. Anyone have any ideas? I've checked all the vacuum lines and connectors and can't seem to find any leaks or loose connections. Any help or insight into something I might be overlooking is greatly appreciated as I am
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think I may have a small exhaust leak around the flex
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