Air Fuel Ratio (A/F) Sensor 1 Heater

WARNING: This page is about a different car, the 2013 Nissan Armada. However, it is still accessible from the selected car via links, so may be relevant.

Check resistance between A/F sensor 1 terminals as follows.

Terminal No.	Resistance
3 and 4	Refer to "A/F SENSOR 1 HEATER ".
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

Courtesy of NISSAN NORTH AMERICA, INC.

If NG, replace air fuel ratio (A/F) sensor 1. Refer to "EXPLODED VIEW ".
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 Heated Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.