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Discussion Starter · #1 ·
I received the P0420 code.
AutoZone game 2 possible converter parts. They didn't know which one I would exactly need.
So first how do I find out the exact part I need and is it possible for me to change this out myself without having to disassemble half the engine.?
Thanks Dan
 

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downstream is sensor on the exhaust under back side of engine.

up stream is in the front of engine on converter itself
 

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My daughters 2014 Cruze LT did not like aftermarket catalytic converter. Had to put on an OEM catalytic converter and also replaced the Upstream and Downstream senor to be safe. After OEM one was on, haven't had the P0420 come back on. Had to apply heat to downstream sensor to get to loosen up.
 
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