NOX Sensor 1/2

Disconnect and isolate the negative battery cable.
Raise and support the vehicle. Refer to HOISTING, STANDARD PROCEDURE .

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Remove the nuts (2) and the fuel filter shield (1).

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Remove the fasteners (1) and the heat shield (2).

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Remove the nuts (2) and the NOx sensor module cover (1).

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NOTE:
DO NOT try to disconnect wire harness connector (3) from the NOx module (1).
Disconnect the NOx sensor wire harness connector (2).
Disconnect the wire harness retainers.

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Use a six sided crow foot to remove the NOx sensor (2) with module from the Selective Catalytic Reduction (SCR) catalyst.
If the NOx sensor (2) fails to loosen use a torque wrench set to 160 N.m (118 ft. lbs.) and loosen the NOx sensor (2).
NOTE:
DO NOT use a torch as a heat source.
If the NOx sensor (2) is still not loose after applying 160 N.m (118 ft. lbs.) then use a heat gun to heat the NOx sensor boss for 1 minute at 450° C (842° F).