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Impala While undergoing many facelifts in its history, the Impala has proved itself to both civilians and police forces as one of the most capable 4-door cars GM has ever offered. Currently moving towards its 10th generation the Impala is one of the longest lasting and popular models.

2014 Chevrolet Impala
Includes: Bel-air
Platform: B-body & W-body

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  #1  
Old 06-15-2009, 10:07 PM
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Default Oxygen sensors

On a 2001 Impala with 3.4L, how many oxygen sensors are there and where are they located?
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Old 06-16-2009, 12:32 AM
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2003 Chevrolet Silverado 2500
 
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You have 2.

One before the cat & one after the cat on your exaust pipes.

I cant find a picture but here is what the book says...



Removal & Installation

Upstream HO2 S1

To Remove:


NOTE: If the engine temperature is lower than 120 F (48 C), the HO2 S1 sensor may be difficult to remove. Excessive force could possibly damage the threads in the exhaust manifold.
  1. If necessary remove the fuel injector cover.
  2. Disconnect the HO2 S1 sensor electrical connector.
  3. Using an oxygen sensor removal tool carefully remove the heated oxygen sensor.
To Install:
  1. Coat the threads of the oxygen sensor with anti-seize compound
  2. Install the HO2 S1 sensor. Tighten the HO2 S1 sensor to 30 ft lb (41 Nm).
  3. Connect the HO2 S1 sensor connector.
  4. If removed, install the fuel injector cover.
Downstream HO2 S2

To Remove:


NOTE: If the engine temperature is lower than 120 F (48 C), the H02 S2 sensor may be difficult to remove. Excessive force could possibly damage the threads in the exhaust pipe.
  1. Raise and safely support the vehicle.
  2. Disconnect the HO2 S2 electrical connector.
  3. Using an oxygen sensor tool carefully remove the H20 S2.
To Install:
  1. Coat the threads of the HO2 S2 with anti-seize compound.
  2. Using an oxygen sensor tool install the HO2 S2.
  3. Tighten the sensor to 30 ft lb (41 Nm).
  4. Connect the HO2 S2 sensor electrical connector.
  5. Lower the vehicle.
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Old 06-16-2009, 04:41 PM
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Thanks alot!
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Old 06-16-2009, 06:45 PM
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Quote:
Originally Posted by firepop5 View Post
Thanks alot!
you bet.
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Old 06-16-2009, 09:04 PM
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the upstream o2 sensor is on the rear exhaust manifold.

may i ask what you're inquiring about these for?
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2001 impala, 3.4, 1.0dhp pcm, fenderwell intake w/k&n filter, 2.5" downpipe-exhaust w/flowmaster 40, 17" helo slick rims, LED tail lights/front turn signals, multi color led LS cluster/ hvac controls, impala embroidered floormats, 20% tint, aftermarket moonroof, turn signal mirrors
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Old 06-17-2009, 12:53 PM
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This is my brother's car and he asked me for some help. He had his computer scanned at a parts store and they told him his O2 sensors were bad. Wanted to have as much info as possible before I start troubleshooting since I'm not familiar with the car. If I decide to swap out the sensors, is AC Delco worth the extra money or are Bosch replacements OK?
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Old 06-17-2009, 01:06 PM
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What code(s) did it throw? They both may not be bad, it could even be something else.
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Old 06-20-2009, 12:36 PM
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I got to see my brothers car today. The "Service vehicle soon" message is showing on dashboard. I scanned the OBD2 connector and got no codes. I would suspect if his O2 sensors were bad, the "check engine" light would come on instead of the service vehicle soon light anyway. I don't know why the shop he visited said he needed Os sensors. I saw their diagnostic report, and there are no codes listed, just a quote to change the O2 sensors.

According to his owners manual, if the service vehicle soon message appears, you must visit the dealer, or there is a problem with a trunk safety system. I'm pretty sure the car doesn't have this safety system on it.

After a little research I suspect the Body Control Module (BCM) is turning on the light. Does this BCM have a diagnostic connection and would an Auto Zone or similar place be able to diagnose or pull codes?

Last edited by firepop5; 07-03-2009 at 07:41 PM.
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Old 07-05-2009, 07:20 AM
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no, autozone or any other parts store wont be able to read BCM codes. you'll most likely have to got to a dealer to get those codes as those codes can only br read with a tech II scanner. the only place i've seen with a tech II is a dealer. you dont have to take it to a chevy dealer, any GM dealer will have a tech II scanner.
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Old 07-06-2009, 12:43 PM
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Ared the BCM codes also accessed from the OBD2 terminal under the dash?
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Old 07-06-2009, 12:43 PM
 
 
 
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53l, aftermarket, bad, chevy, codes, color, corvette, h02, impala, o2, oxygen, sensor, sensors, sensror, tracker


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