QX4 2WD V6-3.5L (VQ35DE) (2003)
Oxygen Sensor: Technical Service Bulletins
Engine Controls - Seized O2 Sensor Removal Procedure
Classification:
EM09-016
Reference:
ITB10-008
Date:
January 19, 2010
REMOVAL PROCEDURE FOR SEIZED EXHAUST SENSOR
APPLIED VEHICLES:
All Infiniti vehicles
SERVICE INFORMATION
If an exhaust sensor is seized in the exhaust manifold/catalyst/front tube perform the procedure described in this bulletin to remove the sensor and
prevent unnecessary replacement of the exhaust manifold/catalyst/front tube.
In most cases this procedure is successful. This is because the threads of the exhaust sensors are made of a softer material than the part they thread into
on the exhaust manifold/catalyst/front tube.
NOTE:
The replacement of exhaust manifolds/catalysts/front tubes for stripped exhaust sensor threads may not be considered a warrantable expense.
This procedure can be performed by two methods:
Method # 1. If the Sensor Can Be Easily Accessed
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The procedure can be performed on the vehicle.
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The exhaust manifold/catalyst/front tube will not have to be removed.
Method # 2. If the Sensor Cannot Be Easily Accessed
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The exhaust manifold/catalyst/front tube must be removed from the vehicle.
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The procedure will be performed with the part clamped in a vice.
Method # 2 is described in this bulletin. Method # 1 is the same as Method # 2 except that it is performed on the vehicle.
SERVICE PROCEDURE
Rust Penetrant
Recommended rust penetrants to be used in this procedure:
NOTES:
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Rust penetrant is considered a shop supply.
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Nissan Rust Penetrant can be ordered through the Nissan Direct Ship Chemical Care Product Program: Website order via link on dealer portal.
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WD-40 is available from various local sources.
Removal Tool
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When removing a seized exhaust sensor with a specialty socket (which contains a slit to accommodate the wiring harness) it may spread open and
strip the sensor.
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Before this occurs it is recommended to cut the wiring harness from the sensor and use a box end wrench or 6-point deep well socket.
1. Clamp the exhaust manifold/catalyst/front tube in a vice.