New after market catalytic converter want work.
I have a Pontiac G6, 2.4l-4cyl.The original catalytic converter was replaced for about 3 yrs. ago. This catalytic converter only worked for about 2 yrs. I drove with the check engine light on ( Po420) until inspection required something to be done. I bought a new aftermarket converter from amazon for about $190, and replaced it myself. The check engine light would still not clear/came back if reset. I measured the temperatur in the front and rear of the converter. The temperatur is supposed to be 100-150 dgr. farenheit higher at the rear when when converter is working. I had a little lower temp at the rear than at the front. That means: converter is not working.
Does anyone have any experience with this? I am wondering if there can be something else that case the converter not to work? I have read that a leak in the intake manifold can make the converter to not work.
Does anyone else have any experience with this?