Air Fuel Ratio (A/F) Sensor 1 Heater

WARNING: This page is about a different car, the 2012 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.

Check resistance between A/F sensor 1 terminals as per the following.

Terminal No.	Resistance [at 25°C (77°F)]
3 and 4	1.98 - 2.66 Ω
3 and 1, 2	∞ Ω (Continuity should not exist)
4 and 1, 2	∞ Ω (Continuity should not exist)

Fig 1: Checking Resistance Between A/F Sensor 1 Terminals 1, 2, 3 And 4

Courtesy of NISSAN NORTH AMERICA, INC.

If NG, replace A/F sensor 1. Refer to EXHAUST MANIFOLD AND THREE WAY CATALYST .

CAUTION:

Discard any A/F sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; use a new one.
Before installing new A/F sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner [Commercial service tool (J-43897-18 or J-43897-12)] and approved Anti-seize Lubricant (Commercial service tool).