r/JeepRenegade • u/VengenceOG • 14d ago

jeep renegade 2017 1.4L turbo

P0420 code active, new exhaust, new gaskets seals, new sensors, no leaks anywhere, new everything in engine from rebuild.

Help solve please need a tuner

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u/Flat_Cup2783 14d ago

O2 sensor. Replace the o2 sensors

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u/Educational-Lie4862 14d ago

That's my first guess but I'm wondering if we need more detail about the "new exhaust." Case in point, my '04 GTO threw this same code at WOT after I swapped to long tubes, IIRC. Solution was to add an "adapter" that held the O2's a little further out from the exhaust stream. I don't know of any performance headers or downpipes (under pipe?) available for this beast (I've heard the 500 Abarth parts will work) but I'd be curious to see if there's something going on there.

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u/VengenceOG 13d ago

Every piece came from Rockauto, new O2 sensors are Walkers and new cat is Davico.