Question about 2004 Oldsmobile Alero

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O2 sensor can anyone tell me where the o2 sensor is on a 2004 olds alero?

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Should have 2 one on the back side of the engine before the cat and one after the cat

Posted on Jun 04, 2009


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Olds alero 3.4 location for oxygen sensor bank1 sensor 1

O2 sensors ( oxygen sensors ) are located after the cat converter and for bank 1 it will be after the cat converter attached to the manifold closest to the firewall
the sensors that you see in the exhaust manifolds or before the cat converter are heated oxygen sensors (HO2S) and are completely different to normal O2 sensors

Mar 27, 2017 | Cars & Trucks

2 Answers

2003 Alero has catalytic converter problem but CConly 1 year old

Keep in mind that many vehicles have two O2 sensors, one upstream of the converter and another downstream of it. I could see that a compromised old one downstream could report (via voltage generation, that's what they do and how they work) that the converter isn't doing it's job. If your vehicle has more than say 90,000 miles on it, they should be replaced unless you're not worried about excessive emissions, lowered fuel economy, or a converter being damaged gradually by improper fuel/air mixture due to a worn out O2 sensor.

Jul 02, 2010 | 2003 Oldsmobile Alero

2 Answers

Has no power

i would say you are probably gonna have to replace the catalytic converter and maby the o2 again

May 27, 2010 | 2002 Oldsmobile Alero

2 Answers

2001 Olds Alero oxygen sensor bank 1 P0135

p0135 indicates bank 1 sensor 1 which is before the cat.

May 22, 2010 | 2001 Oldsmobile Alero

1 Answer

Service engine soon light comes on and off

oxygen sensors are not serviced by mileage on newer models. When the sensor starts to fail, the "check engine" light will go on. Pulling codes will indicate problem areas. On a good running engine, you may never have to replace the O2 sensor,

Mar 05, 2010 | 1999 Oldsmobile Alero

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Where is the o2 sensor 1, bank 1 on a 2000 alero?

the o2 sensors are located on the exhaust pipe will have 1 wire coming of the tip of it the one you want i believe will be close to the motor on the exhaust pipe like just sticking out of it. hope this helps! Good luck

Sep 23, 2009 | 2000 Oldsmobile Alero

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