PO430 code

[Oscurida]

Hello all! The other day my engine light came on and i plugged in the i3 to scan and show the codes. It shows PCM: PO430 catalyst system efficiency below threshold. so i looked it up and says that either the catalytic converter needs to be replaced or there is a problem with the O2 sensors. Cant be the converter cause its brand new and came with headers which was installed under a month ago. So if its the O2 sensors, how do i go about checking if thats the issue? i know extension cables for the O2 sensors also came with the headers package that i got. Any advice?

 

[crackerjack1957]

Headers probably making O2 sensors throw code especially if they are long tubes.......will need to tune out or trick out O2 sensors.

 

[zeddy]

spark plug defoulers always worked for me.

 

[Tach_tech]

Having long tubes with aftermarket cats is likely the issue. Most aftermarket cats flow higher than a factory one and will cause catalyst efficiency codes. Either get a fooler or tune out the rear sensors.