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codes p0411 and p0420

I have a 2001VW Jetta 5 speed GLS with intermittent POWER LOSS, EPC light, and codes p0411 and p0420. Any ideas where to start. I already changed the fuel filter and added injector cleaner to the fuel.

Vehicle: 2001 VW jetta gls
asked Jun 19 by Jim

1 Answer

P0411 incorrect secondary air injection

P0420 catalytic below threshold

These code should not cause a power loss. secondary air injection this could just be a air injection hose that pop out from the MAF (mass airflow air duct) a P0420 with a power loss may just be a plugged catalytic convertor, or the  MAF sensor air duct from the MAF to throttle body may not even be truly connected
answered Jun 21 by Reynaldo (10,835 points)

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