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
$90.03 MSRP: $186.94
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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
$63.13 MSRP: $131.10
You Save: $67.97 (52%)
Ships in 1-2 Business Days
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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:
- 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
$47.51 MSRP: $98.66
You Save: $51.15 (52%)
Ships in 1-3 Business Days
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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:
- 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
$65.39 MSRP: $135.76
You Save: $70.37 (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
$103.57 MSRP: $185.78
You Save: $82.21 (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
$77.88 MSRP: $161.72
You Save: $83.84 (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

The Oxygen Sensor in Chevrolet HHR vehicles refers to the device that is used to measure the quantities of unburned oxygen in the exhaust as a way of regulating the air-fuel mixture for efficiency in the vehicle's performance and lowered emission. From this, it creates a voltage signal out of the degree of the oxygen concentration and this signal is managed by the engine control computer to control the degree of the fuel injector. This particular feedback circuit helps to make the engine working in a 'closed loop' which in turn increases the efficiency of the catalytic converter. Chevrolet HHR models tend to use Zirconium dioxide oxygen sensors, and can incorporate both the upstream and downstream sensors. The upstream sensor activates when there is need to make adjustments on the air-fuel mixture, while the downstream sensor evaluates the catalytic converter condition. Some of the latest models may have wide-band air/fuel ratio sensors which can measure the air and fuel mixtures in a wider scale than that of a narrow-band sensors. Both can be contaminated and degraded with age which in turn increases emissions with tendencies of aggravating engine performance.

Each OEM Chevrolet HHR 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.

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.