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Oxygen Sensor Replacement
 
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Pelican Technical Article:

Oxygen Sensor Replacement

Jared Fenton

Time:

2 hours2 hrs

Tab:

$150 to $300

Talent:

****

Tools:

22mm wrench, Offset oxygen sensor removal tool, penetrant spray, torque wrench

Applicable Models:

Volvo C30 T5 (2008-13)
Volvo C30 T5 R-Design (2008-13)

Parts Required:

Oxygen sensors

Hot Tip:

Soak the sensors with penetrant oil a day or two before hand

Performance Gain:

Better fuel economy

Complementary Modification:

Replace spark plugs and coil packs

The oxygen sensors are a very important part of the fuel injection system. They measure the oxygen content of the exhaust and send signals to the fuel injection computer which in turn, will adjust the fuel/air mixture. When the sensors start to fail, you'll notice a loss of power, fuel economy and possibly a rich mixture smell coming from the tail pipe. This is because the engine goes into a default rich mode when it detects the oxygen sensor performance is below the regular limit. This will usually trigger a Check Engine Light (CEL) indicating that the sensor is failing. You can monitor the sensor function using the factory VIDA diagnostic computer or an aftermarket OBD-2 reader.

Many times, the CEL will note only one particular sensor that has gone bad. You can replace only that sensor although I usually recommend replacing all of the sensors at the same time, especially if the vehicle has 80-100,000 miles on it. It has been my experience that replacing only one leads to the others failing in a short amount of time.

To gain access to the sensors, you'll need to jack up your C30 and place it on jack stands at all four corners. Additionally, you'll need to remove the intake pipe and MAF sensor for access to the electrical connector in the engine bay. See our articles on Jacking up Your C30 and MAF Sensor Replacement for more information.

Shown here is the location of the pre-catalyst oxygen sensor on the Volvo C30 (green arrow).
Figure 1

Shown here is the location of the pre-catalyst oxygen sensor on the Volvo C30 (green arrow). You'll need to access this from under the engine. Use a 22m wrench to loosen and remove the sensor from the exhaust. It also helps to spray the sensor with a penetrant spray beforehand to help with rusty exhaust systems.

Follow the sensor's wiring harness up to the connector just right of the cylinder head (green arrow).
Figure 2

Follow the sensor's wiring harness up to the connector just right of the cylinder head (green arrow). Press the tab on the connector and rotate the lock (yellow arrow) upward. You can now pull the harness off the connector.

The other oxygen sensor is mounted in the side of the catalytic converter.
Figure 3

The other oxygen sensor is mounted in the side of the catalytic converter. You'll need to use a special offset socket to remove the sensor (green arrow). As before, it is very helpful to spray the sensor with penetrant oil beforehand. Once the sensor is loose, pull the wiring harness out of the securing clip (yellow arrow).

Shown here is the special offset socket needed to remove the sensor with a regular 3/8 drive ratchet (part number PEL-4491B).
Figure 4

Shown here is the special offset socket needed to remove the sensor with a regular 3/8" drive ratchet (part number PEL-4491B).

Follow the sensor's wiring harness up to the other securing clip (green arrow) and pull it out.
Figure 5

Follow the sensor's wiring harness up to the other securing clip (green arrow) and pull it out. Follow the harness forward to the connection at the front subframe.

The connector for the harness is located up above the front subframe.
Figure 6

The connector for the harness is located up above the front subframe. You'll have to feel around for it and pull it up and out as shown here. It is difficult to get a picture of the connector, but you'll want to stick a small screwdriver in the opening between the red locking tab and the connector body (green arrow). You'll want to carefully pry the locking tab out of the connector body. As you do this, the two connections will separate and you'll be ready to install the new sensor.

The new oxygen sensors will come with a protective cap over the end of the sensor.
Figure 7

The new oxygen sensors will come with a protective cap over the end of the sensor. Carefully pull the cap off. Underneath, you'll see some anti-seize compound (green arrow) on the threads of the new sensor. Take care not to get any of this into the openings on the sensor (yellow arrow). This can damage the sensor. Once the new sensors are seated, torque them to 40-50 Nm (30-37 ft./lbs.).


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