still get p0420?

2014 CHEVROLET CRUZE
101,600 MILES • 1.4L • TURBO • AUTOMATIC
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FOREMANT1
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  • 2 POSTS
I have replaced the intake manifold.The turbocharger's been replaced turbo lines oil cooler, both 02 sensors, both catalytic converter still get p0420
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Aug 9, 2026 at 1:50 PM
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FOREMANT1
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oh ya. lights flicker from time to time. Did a couple of charging test and first on said no load @ 15.29v load V @15.18v charging ripple @ 80.0mV
sec test was no load 14.75v load V 14.75v charging ripple @28.0 mV could this tell the ECM to not pass the cat sys?
Aug 9, 2026 at 1:58 PM
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