Removal and Installation: Installation

WARNING: This page is about a different car, the 2018 Nissan Titan XD. However, it is still accessible from the selected car via links, so may be relevant.

Remove any protective caps.
NOTE: If the DEF dosing valve is not new and has sat unused for extended periods, manually fill with DEF and let soak for a minimum of 10 minutes before securing the DEF supply line.

Remove adhesive backing from the gasket. Align the gasket with the DEF dosing valve flange (adhesive-side down) and press firmly onto the DEF dosing valve flange to make sure there is flush adhesion with the DEF dosing valve flange sealing surface.
Make sure the DEF dosing valve port (1) is free of gasket material and other debris.

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Install the DEF fluid dosing valve (1) onto the decomposition tube (2).

Courtesy of NISSAN NORTH AMERICA, INC.
NOTE:
- Apply a coat of high temperature anti-seize compound to the DEF dosing valve bolts.
- Do not allow anti-seize lubricant to contact the end of a sensor. Anti-seize lubricant may possibly affect sensor operation.
- Hand-tighten both bolts with the washers (B) until the gasket is seated properly on the decomposition tube.

Tighten the bolts (A).

Step 1	: 4.5 N.m (0.46 kg-m, 40 in-lb)
Step 2	: 9.0 N.m (0.9 kg-m, 80 in-lb)

Connect the DEF supply line and DEF dosing valve harness connector.
Connect the battery or batteries. Refer to Battery Disconnect .
WARNING:
Battery acid and battery acid fumes are extremely dangerous and can cause severe burns and explosion. To help reduce the risk of personal injury;
- Wear appropriate goggles and protective clothing.
- Always properly ventilate the area where the service is being performed.
- Never allow battery fluid to come in contact with skin, eyes, fabrics or painted surfaces.
- To avoid arcing, remove the negative (-) battery cable first and attach the negative (-) battery cable last.
- If acid contacts eyes, skin or clothing, immediately flush with water for 15 minutes and seek medical attention.
CAUTION: To avoid possible damage to the exhaust system and components, do not use the flow test portion of CONSULT Diesel Exhaust Fluid (DEF) Dosing Unit Override Test to check the system for leaks.

NOTE: The DEF dosing system will not prime until the correct SCR temperatures are reached. To verify that the system is correctly installed and has no leaks, induce a stationary regeneration to get the SCR system up to temperature.
Operate the engine and check for leaks.