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#1
03-17-2008, 02:55 PM
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04 alero oxygen sensor
I need to replace the upstream oxygen sensor (on the engine). Does anyone know where it is located?
It is a 4 cylinder engine Last edited by agelism2; 03-17-2008 at 08:11 PM. 
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#2
03-17-2008, 05:21 PM
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Re: 04 alero oxygen sensor
Welcome to AF.
It would help to post what engine you have so members can be accurate in their replies.
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'08 Pontiac Grand Prix GXP (Dark Slate Metallic) - LS4 5.3L V8 '02 Oldsmobile Alero GL2 - LA1 3400 V6 '99 Buick Regal LS - L36 Series II 3800 V6 '03 Honda CR250R MX - 2 Stroke 250cc '97 Pontiac Grand Prix GTP - L67 Series II 3800 V6 Supercharged (Sold) Timeslip 08/12/06 AF Community Guidelines
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#3
03-17-2008, 09:02 PM
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Re: 04 alero oxygen sensor
On the 2.2L Ecotec engine the sensor is located on the driver's side of the exhaust manifold. You have to remove the exhaust heat shield to see it and/or to test/replace.
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'08 Pontiac Grand Prix GXP (Dark Slate Metallic) - LS4 5.3L V8 '02 Oldsmobile Alero GL2 - LA1 3400 V6 '99 Buick Regal LS - L36 Series II 3800 V6 '03 Honda CR250R MX - 2 Stroke 250cc '97 Pontiac Grand Prix GTP - L67 Series II 3800 V6 Supercharged (Sold) Timeslip 08/12/06 AF Community Guidelines
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#4
03-20-2008, 05:46 PM
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Re: 04 alero oxygen sensor
its really easy to do just take the 10mm bolts off for the heat shield. you a oxygen sensor socket (its only like $8 from autozone just ask for it). unplug the sensor take old one out put new one in. you can either disconnect the battery for 3 hours or just drive it and it will go away.
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99 olds alero 2.4 DD 92 notchback with 460 carb'ed
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