Question about 1999 Oldsmobile Alero

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Where is the upstream o2 sensor on my 4 cyliner 1999 alero

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THE UPSTREAM OXYGEN SENSOR MOUNTED IN THE EXHAUST SYSTEM BEFORE THE CATALYTIC CONVERTER.

Posted on Sep 17, 2010

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Posted on Jan 02, 2017

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1996 5.7 vortec misfire cyliner 4 and 6


have you cleared the codes between fault reads
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1 Answer

How many oxygen sensors are there on a 1996 ford explorer 8 cyl., 4.0 eng.


The answer depends on the type of exhaust system you have. You will have either 3 or 4 total O2 sensors on your V8. If you have single exhaust with a single catalytic converter then you will have 3 O2 sensors (2 upstream sensors & one downstream sensor - "up or down stream" meaning before of after the catalytic converter). If you have either dual exhaust and/or two catalytic converters then you have 4 O2 sensors (2 upstream & 2 downstream). If you have an MIL light (malfunction indicator light, or "check engine light") the code will indicate "front bank / bank one", which is one of the 2 upstream O2's before the catalytic converter(s), or "rear bank / bank two", which is one of the O2's after the catalytic converter(s).

Apr 22, 2012 | 1996 Ford Explorer

1 Answer

How hard is it to replace an upstream o2 sensor on a 99 sephia, and where is it?


YOUR 02 SENSOR UPSTREAM IS LOCATED ....IF YOU LOOK RIGHT BETWEEN THE VALVE COVER AND RADIATOR YOU WILL SEE A EXHAUST SHIELD THE HOLE IN THE MIDDLE WITH THE SENSOR COMING OUT WOULD BE YOUR UPSTREAM 02 GOOD LUCK

Jan 09, 2011 | 1999 Kia Sephia

1 Answer

Where are all three o2 censors in a 1999 s10 blazer. 4 door V6 engine and 4x4


The upstream O2 sensors will be before the catalytic converter just down from where the exhaust pipe(s) attache to the exhaust manifold. The downstream O2 will be right after the catalytic converter. Once you crawl under the vehicle they will be pretty obvious where they are in the exhaust pipe.

Oct 23, 2010 | 1999 Chevrolet Blazer

1 Answer

Where is the upstream oxygen sensor located


upstream oxygen sensor or bank 1 as its called is the closest to the exhaust manifold. now for the question back there are usually 4 o2 sensors on a car bank(front)1 sensor 1, bank 1 sensor 2 and (rear) bank 2 sensor 1, bank 2 sensor 2

Sep 03, 2010 | 1999 Chevrolet Malibu

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

1999 Protege, need to reset internal comp.


there are more then 1 o2 sensor find out if is a upstream or downstream sensor before installing remove the battery cable this will reset the computer

Mar 03, 2010 | 1999 Mazda Protege

1 Answer

Where is the camshaft position sensor on 1999 olds alero?


ON THE 4 CYLINER ENGINE CAMSHAFT SENSOR LOCATED AT THE LEFT DRIVERS SIDE OF THE TIMING COVER. THE V - 6 ENGINES CAMSHAFT POSITION SENSOR LOCATED AT THE FRONT OF ENGINE BLOCK BELOW THE POWER STEERING PUMP.

Feb 13, 2010 | 1999 Oldsmobile Alero

2 Answers

P0171 code on 1999 olds cutlass 3.1liter


Check to make sure all vacunm hoses and lines are correctly in place. A Lean code generally means that air is getting in past Mass Air Flow Sensor.Upstream O2 sensors read exhaust b4 Cat converter.

Dec 12, 2009 | 1999 Oldsmobile Alero

1 Answer

Does my 1999 Mercury Mystique have 4 O2 Sensors or am I wrong?


the sensors before the catalytic converters are the upstream sensors, the ones after the after the catalytic converters are the down stream sensors, Ford calls them the Catalyst efficiency monitors.

Apr 26, 2009 | 1999 Mercury Mystique

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