Sentra L4-1.8L (QG18DE) SULEV (2003)
Check resistance between terminals 3 and 4.
Resistance: 2.3 - 4.3 Ohm at 25 °C (77 °F)
Check continuity between terminals 3 and 1 2, 5, 6, terminals 4 and 1,2,5,6.
Continuity should not exist.
If NG, replace the A/F sensor 1.
CAUTION:
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Discard any A/F sensor which has been dropped from a height of more than 0.5 m (19.7 in) on to a hard surface such as a concrete floor; use a
new one.
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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.