Obscure sources for GM catalytic converters?

[davesmopar]

@Mustangman

@Todd52

It doesn’t seem we’ll need a new cat after all

Could you please explain why you don’t need a cat anymore?

Understanding P0420 code on 2008 Pontiac G6 GT

Big news! At least for the present, the cat problem is solved…and for roughly $20! Compare to the Bank 1 test above: [new_bank1_cat_test] In a YouTube video on cleaning cats, in the comments someone mentioned removing the upstream oxygen sensor and carefully spraying an entire can of throttle body cleaner into the hole while the engine runs. I then cleared the codes and waited for the results. Today the readiness indicator came back and with no P420. Going to get it to the gara…