A Bad O2 Sensor. - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Nenous1 · 07-02-2023, 11:34 AM

Had a P0420 popup this past thursday and i was a bit surprised but not much, but it wasn't the catalytic converter, it was the downstream sensor..

Sidenote: Just before the engine light came on i noticed my gas milage dropped alot, is that common place'Or could something had caused that sensor to fail, something i'm over looking.

Miami_SS · 07-03-2023, 12:21 AM

I have the same issue too and had similar symptoms. It gave me an excuse to upgrade my stock downpipes to American Racing hi-flow downpipes with single cats (versus 2 for stock) and purchase 4 new O2 sensors from NAPA + add a Magana flow 2.5" cross-over pipe + 2.5" to 4" axle back exhaust. Sometimes a bad O2 sensor is a good excuse to mod/upgrade!

Nenous1 · 07-03-2023, 07:01 AM

Quote:

Originally Posted by Miami_SS

I have the same issue too and had similar symptoms. It gave me an excuse to upgrade my stock downpipes to American Racing hi-flow downpipes with single cats (versus 2 for stock) and purchase 4 new O2 sensors from NAPA + add a Magana flow 2.5" cross-over pipe + 2.5" to 4" axle back exhaust. Sometimes a bad O2 sensor is a good excuse to mod/upgrade!

The problem is' i just had a re-manufactured engine put in and i put new everything in and when a new O2 sensor goes bad for no reason, that's suspect to some sorta possible blow by went thru the exhaust system causing that failure.

Or it could be just a bad sensor.

CamaroCracka · 07-04-2023, 07:12 AM

A mileage drop would be associated with the front O2 sensor since that is input to the fuel injection system. The rear O2 only checks if the cat is working.

07-02-2023, 11:34 AM	#1
Nenous1 Drives: 2011 Camaro rs Join Date: Jun 2023 Location: NC Posts: 65	A Bad O2 Sensor. Had a P0420 popup this past thursday and i was a bit surprised but not much, but it wasn't the catalytic converter, it was the downstream sensor.. Sidenote: Just before the engine light came on i noticed my gas milage dropped alot, is that common place'Or could something had caused that sensor to fail, something i'm over looking.

07-04-2023, 07:12 AM	#4
CamaroCracka Drives: 2010 Turbo LS3 Join Date: Dec 2009 Location: Palm Bay, FL Posts: 3,041	A mileage drop would be associated with the front O2 sensor since that is input to the fuel injection system. The rear O2 only checks if the cat is working. __________________ 2010 SS - Kind of an On3 kit, CTR 78/80, CompCam 239/251 620/632 122+4, E85, Z28 suspension and ZL1 diff with Outlaw axles. Gen6 ZL1 brakes. 2011 Vert - 416/w 230/236 .612/.602 115lsa, 1LE suspension w/32mm rear bar. Z28 diff. Gen6 ZL1 brakes.

07-03-2023, 12:21 AM	#2
Miami_SS Drives: 2011 Camaro SS LS3 Join Date: Jan 2022 Location: Miami Posts: 37	I have the same issue too and had similar symptoms. It gave me an excuse to upgrade my stock downpipes to American Racing hi-flow downpipes with single cats (versus 2 for stock) and purchase 4 new O2 sensors from NAPA + add a Magana flow 2.5" cross-over pipe + 2.5" to 4" axle back exhaust. Sometimes a bad O2 sensor is a good excuse to mod/upgrade!