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2017 DGC SXT
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The pics you provided show that the intake is missing some mounting hardware. It looks like they didn’t install the intake manifold properly.

The intake manifold has two studs in the front and they slide into two brackets near the front (radiator side) of the van. Once the studs go into the bracket holes, they are fastened together with nuts. If the intake was installed improperly, maybe it could be leaking. Extra oxygen entering the system could be causing the p0420 code.

Tell them to install the intake properly first, that might be causing the code. It seems that this dealer is shady. Lying and doing low quality work. I agree that you should get Chrysler cares involved, if needed.
 
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