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Oxygen Sensor Turbocharged Engine Replacement
 
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Pelican Technical Article:

Oxygen Sensor Turbocharged Engine Replacement

Nick Czerula

Time:

3 hours3 hrs

Tab:

$200

Talent:

*****

Tools:

Oxygen sensor socket, 7mm socket, torque wrench

Applicable Models:

R56 MINI Cooper S Hatchback (2007-11)

Parts Required:

Oxygen sensors, anti-seize paste

Hot Tip:

Work with a cool exhaust

Performance Gain:

Remedy fault codes and maintain proper running engine

Complementary Modification:

Replace in pairs

Oxygen sensors monitor the exhaust stream, comparing the oxygen content in it to the oxygen content of ambient air. When oxygen content is low, sensor voltage is high, when oxygen content is high, sensor voltage is low. The voltage created by the sensor is sent to the DME (engine control module) to help maintain a proper fuel mixture. The mixture preparation is used to keep the catalytic converters running at peak efficiency. The oxygen sensors used in R56 models covered in this article have four wires. Two of which are for oxygen sensor heating and two for the signal. The heater is used to get the sensor online faster. Previously, exhaust heat was used. One wire supplied a ground to the sensor for the signal, and the other is for the sensor signal.

The R56 MINI engine utilizes a wide band oxygen sensor for the pre-catalyst sensors and a standard Zirconia element for the post-catalyst sensors. Wide band sensors begin to operate faster and provide faster more precise exhaust oxygen content to the DME.

Oxygen sensors should be replaced every 100,000 miles. In a perfect world that would be it; wait until a specified mileage and replace the sensor. However, these sensors fail prematurely, set oxygen sensor fault codes and reduce fuel economy. In this article, I will show you how to identify the location of all four oxygen sensors and how to replace them. You will need an oxygen sensor socket to remove the sensors and remember to always work with a cool exhaust. Oxygen sensors are fragile. Do not drop one as damage may occur. Also, keep the sensor tip clean when reinstalling.

Oxygen sensors are laid out in sensor numbers referring to before or after the catalytic converter. Sensor 1 or S1 refers to the sensor before the catalytic converter. Sensor 2 or S2 refers to the sensor after the catalytic converter.

Remember that your car may have been serviced before and had parts replaced with different size fasteners used in the replacement. The sizes of the nuts and bolts we give may be different from what you have so be prepared with different size sockets and wrenches.

Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If you're working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Never work on your vehicle if you feel the task is beyond your ability.

Our vehicle may vary slightly from yours as models do change and evolve, as they grow older. If something seems different, let us know and share your info to help other users. Do you have uestions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.

TIP: Individuals report that using anything other than OEM replacement sensors such as Bosch for the pre-cat sensor have been known to trip a check engine light. A recommendation is to run Genuine or OEM supplier NTK oxygen sensor for the pre-cat sensor.  You can run Bosch as the post-cat sensor with no issues.

Sensor 1 is identified by the red arrow, mounted in the turbocharger.
Figure 1

Sensor 1 is identified by the red arrow, mounted in the turbocharger.

Sensor 2 is identified by the red arrow, as viewed from below, mounted in the front exhaust pipe.
Figure 2

Sensor 2 is identified by the red arrow, as viewed from below, mounted in the front exhaust pipe.

Sensor 1: Working at the valve cover, remove the wiring harness (green arrow) from the valve cover.
Figure 3

Sensor 1: Working at the valve cover, remove the wiring harness (green arrow) from the valve cover. Then detach the wire tie (red arrow).

Sensor 1: Disconnect the electrical connector.
Figure 4

Sensor 1: Disconnect the electrical connector. Press the release tab (green arrow) and pull it apart.

Sensor 1: Once disconnected, remove the wiring harness (green arrow) from the mounts (red arrow).
Figure 5

Sensor 1: Once disconnected, remove the wiring harness (green arrow) from the mounts (red arrow). Slide the connector housing toward the radiator.

Sensor 1: Using an oxygen sensor socket (red arrow), loosen the oxygen sensor from the turbocharger.
Figure 6

Sensor 1: Using an oxygen sensor socket (red arrow), loosen the oxygen sensor from the turbocharger. Unscrew and remove the oxygen sensor.

Sensor 1: Lightly coat the new oxygen sensor thread (red arrow) with anti-seize compound.
Figure 7

Sensor 1: Lightly coat the new oxygen sensor thread (red arrow) with anti-seize compound. Install the new oxygen sensor and tighten it to 50Nm (37 ft-lb) with a torque wrench. Then reroute the wiring harness and connect the electrical connector. Then clear any engine fault codes using a MINI scan tool.

Sensor 2: Remove the coolant expansion tank 7mm fastener (green arrow).
Figure 8

Sensor 2: Remove the coolant expansion tank 7mm fastener (green arrow).

Sensor 2: Detach the expansion tank from the radiator support by lifting the rear up then removing it from the radiator support.
Figure 9

Sensor 2: Detach the expansion tank from the radiator support by lifting the rear up then removing it from the radiator support. Place the expansion tank aside. Leave the hoses connected.

Sensor 2: Locate the oxygen sensor connector (green arrow).
Figure 10

Sensor 2: Locate the oxygen sensor connector (green arrow). Then disconnect it by sliding the lock (red arrow) up and pulling the connector apart.

Sensor 2: Follow the sensor harness (red arrow) down to the engine bracket and remove it from the mounts (green arrows).
Figure 11

Sensor 2: Follow the sensor harness (red arrow) down to the engine bracket and remove it from the mounts (green arrows).

Sensor 2: Raise and support the front of your MINI.
Figure 12

Sensor 2: Raise and support the front of your MINI. Then pull the sensor wiring harness down (green arrow). Using an oxygen sensor socket (red arrow), loosen the oxygen sensor from the front exhaust pipe. Unscrew and remove the oxygen sensor.

Sensor 2: Lightly coat the new oxygen sensor thread (red arrow) with anti-seize compound.
Figure 13

Sensor 2: Lightly coat the new oxygen sensor thread (red arrow) with anti-seize compound. Install the new oxygen sensor and tighten it to 50Nm (37 ft-lb) with a torque wrench. Then reroute the wiring harness and connect the electrical connector. Then clear any engine fault codes using a MINI scan tool.

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Comments and Suggestions:
Khun jon Comments: Need to order both oxy sensors that are built for reliability .CAN YOU PLEASE SEND TO THAIKHUN@OUTLOOK.COM
ASAP HAWAII COST MUST BE THRIFTY.
February 18, 2016
  Followup from the Pelican Staff: What is the year and model of the vehicle?


Give our parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
Boo1996 Comments: I have a 2007 Mini Cooper 2 door coupe that I need to change the front oxygen sensor out. Can you help me 1. Locate the sensor and 2. Tell me how to change it out Please.
December 9, 2015
  Followup from the Pelican Staff: We don't currently have that tech article. If we get a chance to perform the procedure, we will be sure to document it.

I would grab a repair manual. It will have the procedure, special tools and torque specs.

Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 

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