04-29-2014, 06:55 PM
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#1
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Premier V.I.P. Member
Join Date: May 2011
Location: Ferdinand Indiana
Posts: 2,742
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p0420 Catalyst System Low Efficiency
Threw the code today. The rear 02 is brand new so I know its not that. idle's very smooth and runs great so I'm kinda at a loss here. Could it just be the cat going bad? Anyone else had this one come up?
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3rd alero- 02 GX 2.2 5sp coupe. drove for 3 years 55,000 miles. Sold for a kids first car, and missed
01 Intrigue GX
2016 Chevy SS, Jet Black
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04-29-2014, 07:42 PM
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#2
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GLS member
Join Date: Aug 2010
Location: indy
Posts: 8,411
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S. . .L. . . E . . .E. . .P. . .Y. . .IS A TRAITOR--HE GOT BORED SO HE SOLD ME AFTER HAVING AN AFFAIR WITH A RICE ROCKET
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Meet Destiny, shes a 2001 Oldsmobile Alero GLS, F40 6MT swap. (#2 of 3)
2/24/14 - 200,000 miles body/motor. 22,300 on F40.
Quote:
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Last edited by sleepyalero : 04-29-2014 at 08:31 PM.
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04-29-2014, 08:32 PM
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#3
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15.65 @ 87.3 MPH
Join Date: Nov 2009
Location: Sarnia, Ontario
Posts: 1,189
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If your catalytic converter isn't doing its job then it could throw that code even if the car is running fine. If it was something else then I would imagine other codes being present as well. Also was the O2 sensor an OEM replacement or aftermarket?
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Hit a dear! Back to stock 3400... For now
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04-29-2014, 10:24 PM
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#4
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Premier V.I.P. Member
Join Date: Dec 2009
Location: New Hampshire
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What I would do at work is I would scan front and rear o2 sensors voltages. If the cat was working you would see the front o2 toggling high and low voltage and the rear o2 would be fairly smooth. If that cat was bad the. You would find both sensors toggling high and low. However. Typically it's just a bad cat. Very rarely have I seen it be something else.
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The dumbass that shows up randomly 10 years after selling the car.
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04-29-2014, 11:00 PM
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#5
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Premier V.I.P. Member
Join Date: May 2011
Location: Ferdinand Indiana
Posts: 2,742
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02 sensor was a new factory replacement. I feel like I would be noticing SOMETHING else is their was a problem other then the cat going bad. I havent been able to check voltages on the 02 sensors yet but I do know what to look for, I'm an electronic tech myself and wired up code eliminators on the mustang. I think I can pretty well rule out most of the stuff on sleepy's list. The cat its self just seems like to best to start at least. Probably have to go with a piece of test pipe in place and wire in a code eliminator for now. catalytic converters are to damn expensive.
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3rd alero- 02 GX 2.2 5sp coupe. drove for 3 years 55,000 miles. Sold for a kids first car, and missed
01 Intrigue GX
2016 Chevy SS, Jet Black
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04-29-2014, 11:52 PM
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#6
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Premier V.I.P. Member
Join Date: Dec 2009
Location: New Hampshire
Posts: 1,979
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If it's not plugged, do t worry about replacing it with strait pipe.
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The dumbass that shows up randomly 10 years after selling the car.
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05-12-2014, 09:08 PM
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#8
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Premier V.I.P. Member
Join Date: May 2011
Location: Ferdinand Indiana
Posts: 2,742
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any input? I believe alero's meet California emissions so will a cat that is otherwise legal but doesnt meet California emission through a code?
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3rd alero- 02 GX 2.2 5sp coupe. drove for 3 years 55,000 miles. Sold for a kids first car, and missed
01 Intrigue GX
2016 Chevy SS, Jet Black
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05-12-2014, 10:31 PM
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#9
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Aleromod part owner
Join Date: Nov 2003
Location: Far Northeast Philadelphia, PA
Posts: 18,199
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Is this the Alero you picked up by me?
If it has the AIR tubes on it, it has the Cali emissions, if it doesn't, it just has regular emissions
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2000 Olds Alero 3400 SFI 14.53 @ 94.93
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