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2012 chu613 mp8 won’t build temps and cutting out on regen


c-mac
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Had one doing this before but I can’t remember what the problem was. I’ve reprogrammed with the latest software. It will not get over 360deg on regen and never starts dosing. The engine sounds like it’s going into fuel cut or missing. Checked all exhaust temp sensors, VGT function and I believe the EGR is working properly. Fuel pressure is good. The status read purging air the whole time. I haven’t checked but maybe the doing module is spraying a butt load of air into the exhaust? It won’t set any DTC’s . It runs fine though. It has the turbo bypass but non functional when regening.

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