What is the purpose and location of oxygen sensors in Chevrolet Cobalt,HHR and Saturn ION with OBD-II engine management systems?

There is a galvanic battery called oxygen sensor that gives out a small voltage based on the amount of oxygen in the exhaust gases. A voltage change from stoichiometric 14.7:1 is needed by the catalyst for proper function. Motor vehicles whose engines are controlled by On-Board Diagnostics II (OBD-II) can confirm if the oxygen sensor and PCM feedback circuit are working correctly. Oxygen content level in the exhaust gas before and after catalytic converter can be used to determine it. The sensors upstream and downstream have heaters making them warm up quickly. It should be noted, though, that these sensors are very fragile and should be handled with extreme care as they can easily break when being serviced or replaced. In case of sensor replacement, it is important to start an engine within a short period to help remove old ones without damaging them further during removals. An upstream oxygen sensor can be screwed off with an oxygen socket and it lies on left side of the exhaust manifold while downstream one unscrews likewise using an oxygen socket located behind a catalytic converter. After removing sensors, any old sensor must be reused by applying anti-seize compound to ensure reinstallation of new sensors with already coated threads otherwise might also require application of anti-seize compounds as well.

Genuine Saturn Ion Oxygen Sensor

Oxygen O2 Sensor

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5 Oxygen Sensors found

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Saturn Ion Sensor Assembly, Heated Oxygen (Position 1)
Part Number: 12580827
$63.13 MSRP: $131.10
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Product Specifications
- Other Name: SENSOR, Computer Control Sensors; Front Oxygen Sensor, Oxygen Sensor
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2005-2007 Saturn Ion | 2 DOOR, 4 DOOR, REDLINE 2 DOOR | 4 Cyl 2.2L, 4 Cyl 2.4L
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Saturn Ion Sensor Asm,Heated Oxygen
Part Number: 12578576
$90.03 MSRP: $186.94
You Save: $96.91 (52%)
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Product Specifications
- Other Name: SENSOR, Computer Control Sensors; Oxygen Sensor, Rear Oxygen Sensor
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2005-2007 Saturn Ion | 2 DOOR, 4 DOOR, REDLINE 2 DOOR | 4 Cyl 2.0L, 4 Cyl 2.2L, 4 Cyl 2.4L
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Saturn Ion Sensor Assembly, Heated Oxygen (Position 1)
Part Number: 12611127
$40.94 MSRP: $85.00
You Save: $44.06 (52%)
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Product Specifications
- Other Name: SENSOR, Computer Control Sensors; Front Oxygen Sensor, Oxygen Sensor
- Replaces: 12609001
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2007 Saturn Ion | 2 DOOR, 4 DOOR, REDLINE 2 DOOR | 4 Cyl 2.2L
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Saturn Ion Sensor Assembly, Heated Oxygen (Position 1) *Black
Part Number: 12568234
$51.78 MSRP: $107.52
You Save: $55.74 (52%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: SENSOR, Computer Control Sensors; Front Oxygen Sensor, Oxygen Sensor
- Replaces: 12569496
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2003-2007 Saturn Ion | 2 DOOR, 4 DOOR, REDLINE 2 DOOR | 4 Cyl 2.0L, 4 Cyl 2.2L
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Saturn Ion Sensor Asm,Heated Oxygen (Position 2)
Part Number: 12576711
Product Specifications
- Other Name: SENSOR, Computer Control Sensors; Oxygen Sensor
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2003-2004 Saturn Ion | 2 DOOR, 4 DOOR, REDLINE 2 DOOR | 4 Cyl 2.0L, 4 Cyl 2.2L

Saturn Ion Oxygen Sensor

Oxygen Sensor is used extensively in Saturn Ion automobiles to determine the unburned oxygen content in the exhaust gases that are produced by the engine; therefore, it helps in adjusting the amount of air and fuel that is supplied to the engine and hence helps the automobiles to produce fewer exhaust emissions. It produces a voltage signal, which is proportional with the concentration of oxygen in the exhaust gases and thus the engine control computer will balance the fuel injector pulse width. Such feedback mechanism helps the engine to work in a "closed loop", which improves efficiency of the catalytic converter. Saturn Ion models often have zirconium dioxide based oxygen sensors which may be combined with upstream and downstream oxygen sensors. The first one working as a regular AFM (AirFuel Metering) sensor, the second one as a CCT (Catalytic Converter Temperature) sensor. It is also possible that some of the new models may have wideband air/fuel ration sensors which cover a wider spectrum than NB sensors. Both types are vulnerable to contamination and aging and therefore their performance can degrade and cause higher emissions.

Each OEM Saturn Ion Oxygen Sensor we offer is competitively priced and comes with the assurance of the manufacturer's warranty for the part. Furthermore, we guarantee the speedy delivery of your orders right to your doorstep. Our hassle-free return policy is also in place for your peace of mind.

Saturn Ion Oxygen Sensor Parts Questions & Experts Answers

Sensor Assembly, Heated Oxygen (Position 1)
12580827
Q: What is the purpose and location of oxygen sensors in Chevrolet Cobalt,HHR and Saturn ION with OBD-II engine management systems?
A: There is a galvanic battery called oxygen sensor that gives out a small voltage based on the amount of oxygen in the exhaust gases. A voltage change from stoichiometric 14.7:1 is needed by the catalyst for proper function. Motor vehicles whose engines are controlled by On-Board Diagnostics II (OBD-II) can confirm if the oxygen sensor and PCM feedback circuit are working correctly. Oxygen content level in the exhaust gas before and after Catalytic Converter can be used to determine it. The sensors upstream and downstream have heaters making them warm up quickly. It should be noted, though, that these sensors are very fragile and should be handled with extreme care as they can easily break when being serviced or replaced. In case of sensor replacement, it is important to start an engine within a short period to help remove old ones without damaging them further during removals. An upstream oxygen sensor can be screwed off with an oxygen socket and it lies on left side of the exhaust manifold while downstream one unscrews likewise using an oxygen socket located behind a catalytic converter. After removing sensors, any old sensor must be reused by applying anti-seize compound to ensure reinstallation of new sensors with already coated threads otherwise might also require application of anti-seize compounds as well.