P0420 Catalyst Efficiency Bank 1

[kuishe]

Hi all!

Out on a regular drive & all of a sudden this code & the engine light came on(not blinking) but however car still drives normal. I think bank 1 is the driver's side? Does this code affect performance or how the car behaves at all though? Should I stop driving the car entirely til I get the issue fixed to avoid hurting stuff?

FYI car is bone stock exhaust never ever touched. Maybe simply just a bad o2 sensor?

Thanks for the inputs!

[1.8t]

I threw this code recently as well. It pertains to the downstream O2. “Should” be a bad sensor since everything is stock.

[kuishe]

I threw this code recently as well. It pertains to the downstream O2. “Should” be a bad sensor since everything is stock.

I take it you mean the one just above the front jack point right? There's a 2nd o2 further down too?

[Jack B]

I take it you mean the one just above the front jack point right? There's a 2nd o2 further down too?

that is the rear 02

[kuishe]

that is the rear 02

So P0420 specifically refers to the one by the front jack point & the rear o2 would be a different code?

[kuishe]

Is the part # for the rear 5149180AA ?

[AZTVR]

Is the part # for the rear 5149180AA ?

The "rear" O2 sensor is called the downstream sensor. The dealer parts website that I looked at has the 5149180AA description as "Sensor, Oxygen - upstream sensor," i.e., the one mounted between the exhaust port and the catalytic converter.

(I suspect that you may be misinterpreting some of the posts above.)

[Jack B]

The front and rear are the same except the connectors are keyed differently.

[kuishe]

The "rear" O2 sensor is called the downstream sensor. The dealer parts website that I looked at has the 5149180AA description as "Sensor, Oxygen - upstream sensor," i.e., the one mounted between the exhaust port and the catalytic converter.

(I suspect that you may be misinterpreting some of the posts above.)

I been looking to buy a rear the whole time & dodgeparts.com has the Lwr o2 as 5149180AA & the Ft o2 as 68090640AA

So after what you said I tried moparpartscanada.ca & they got upper o2 as 5149180AA & lower o2 as 68090640AA which matches what you saying!

So I don't know what's going on here lol...

[kuishe]

The front and rear are the same except the connectors are keyed differently.

Which means it's still front & rear specific then I suppose...

[Jack B]

Which means it's still front & rear specific then I suppose...

yes sir