Air Fuel Ratio (A/F) Sensor 1 Heater

WARNING: This page is about a different variant/trim than selected.

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

TERMINALS RESISTANCE CHART

Terminal No.	Resistance
3 and 4	1.8 - 2.44 Ω [at 25°C (77°F)]
3 and 1, 2	∞ Ω (Continuity should not exist)
4 and 1, 2	∞ Ω (Continuity should not exist)

If NG, replace air fuel ratio (A/F) sensor 1.
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.
  
  Fig 1: Checking Resistance Between A/F Sensor Terminals
  Courtesy of NISSAN MOTOR CO., U.S.A.