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 Chevrolet HHR Oxygen Sensor

Oxygen O2 Sensor

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7 Oxygen Sensors found

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Chevrolet HHR Sensor Asm,Heated Oxygen
Part Number: 12578576
$87.66 MSRP: $182.02
You Save: $94.36 (52%)
Ships in 1-2 Business Days
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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:
- 2006-2011 Chevrolet HHR | 5 DOOR HIGH ROOF HATCHBACK, 5 DOOR HIGH ROOF HATCHBACK SS, 5 DOOR HIGH ROOF PANEL, 5 DOOR HIGH ROOF PANEL SS, 5 DOOR UPLEVEL HIGH ROOF HATCHBACK, 5 DOOR UPLEVEL HIGH ROOF PANEL | 4 Cyl 2.2L, 4 Cyl 2.2L Flex, 4 Cyl 2.4L
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Chevrolet HHR Sensor Assembly, Heated Oxygen (Position 1)
Part Number: 12611127
$40.94 MSRP: $85.00
You Save: $44.06 (52%)
Ships in 1-2 Business Days
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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:
- 2007-2011 Chevrolet HHR | 5 DOOR HIGH ROOF HATCHBACK, 5 DOOR HIGH ROOF HATCHBACK SS, 5 DOOR HIGH ROOF PANEL, 5 DOOR HIGH ROOF PANEL SS, 5 DOOR UPLEVEL HIGH ROOF HATCHBACK, 5 DOOR UPLEVEL HIGH ROOF PANEL | 4 Cyl 2.2L, 4 Cyl 2.2L Flex, 4 Cyl 2.4L
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Chevrolet HHR Sensor Assembly, Heated Oxygen (Position 1)
Part Number: 12580827
$61.48 MSRP: $127.66
You Save: $66.18 (52%)
Ships in 1-2 Business Days
ADD TO CART
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:
- 2006 Chevrolet HHR | 5 DOOR HIGH ROOF HATCHBACK, 5 DOOR UPLEVEL HIGH ROOF HATCHBACK | 4 Cyl 2.2L
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Chevrolet HHR Sensor Assembly, Heated Oxygen (Position 1)
Part Number: 12606671
$46.27 MSRP: $96.06
You Save: $49.79 (52%)
Ships in 1-3 Business Days
ADD TO CART
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:
- 2008 Chevrolet HHR | 5 DOOR HIGH ROOF HATCHBACK, 5 DOOR HIGH ROOF PANEL, 5 DOOR UPLEVEL HIGH ROOF HATCHBACK, 5 DOOR UPLEVEL HIGH ROOF PANEL | 4 Cyl 2.4L
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Chevrolet HHR Sensor Assembly, Heated Oxygen (Position 1)
Part Number: 12602047
$63.67 MSRP: $132.20
You Save: $68.53 (52%)
Ships in 1-2 Business Days
ADD TO CART
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:
- 2006-2007 Chevrolet HHR | 5 DOOR HIGH ROOF HATCHBACK, 5 DOOR HIGH ROOF PANEL, 5 DOOR UPLEVEL HIGH ROOF HATCHBACK, 5 DOOR UPLEVEL HIGH ROOF PANEL | 4 Cyl 2.4L
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Chevrolet HHR Sensor Assembly, Heated Oxygen (Position 1)
Part Number: 12589380
$100.85 MSRP: $180.90
You Save: $80.05 (45%)
Ships in 1-2 Business Days
ADD TO CART
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:
- 2008-2010 Chevrolet HHR | 5 DOOR HIGH ROOF HATCHBACK SS, 5 DOOR HIGH ROOF PANEL SS | 4 Cyl 2.0L
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Chevrolet HHR Sensor Assembly, Heated Oxygen (Position 2)
Part Number: 12616506
$75.84 MSRP: $157.46
You Save: $81.62 (52%)
Ships in 1-2 Business Days
ADD TO CART
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:
- 2008-2010 Chevrolet HHR | 5 DOOR HIGH ROOF HATCHBACK SS, 5 DOOR HIGH ROOF PANEL SS | 4 Cyl 2.0L

Chevrolet HHR Oxygen Sensor Parts Questions & Experts Answers

Sensor Assembly, Heated Oxygen (Position 1)
12611127
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.