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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 2412 (Engine Control System - DTCS U0101 To P0183 (VQ40DE)) >> DTC P0138, P0158: Ho2S2 >> Component Inspection >> Heated Oxygen Sensor 2

Heated Oxygen Sensor 2

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.

With CONSULT

  1. Turn ignition switch ON and select "DATA MONITOR" mode with CONSULT.
  2. Start engine and warm it up to the normal operating temperature.
  3. Turn ignition switch OFF and wait at least 10 seconds.
  4. Start engine and keep the engine speed between 3, 500 and 4, 000 RPM for at least 1 minute under no load.
  5. Let engine idle for 1 minute.
  6. Select "FUEL INJECTION" in "ACTIVE TEST" mode, and select "HO2S2 (B1)/(B2)" as the monitor item with CONSULT.
  7. Check "HO2S2 (B1)/(B2)" at idle speed when adjusting "FUEL INJECTION" to ±25%.
Fig 1: HO2S2 Voltage Graph
G08170501Courtesy of NISSAN NORTH AMERICA, INC.

"HO2S2 (B1)/(B2)" should be above 0.68V at least once when the "FUEL INJECTION" is +25%  .

"HO2S2 (B1)/(B2)" should be below 0.18V at least once when the "FUEL INJECTION" is -25%  .

CAUTION:
  • Discard any heated oxygen 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 oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.

Without CONSULT

  1. Start engine and warm it up to the normal operating temperature.
  2. Turn ignition switch OFF and wait at least 10 seconds.
  3. Start engine and keep the engine speed between 3, 500 and 4, 000 RPM for at least 1 minute under no load.
  4. Let engine idle for 1 minute.
  5. Set voltmeter probes between ECM terminal 74 [HO2S2 (B1) signal] or 55 [HO2S2 (B2) signal] and ground.
  6. Check the voltage when revving up to 4, 000 RPM under no load at least 10 times.

    (Depress and release accelerator pedal as soon as possible.)

    The voltage should be above 0.68V and below 0.18V at least once during this procedure  .

    If the voltage can be confirmed at step 6, step 7 is not necessary  .

  7. Keep vehicle at idling for 10 minutes, then check voltage. Or check the voltage when coasting from 80 km/h (50 MPH) in D position with "OD" OFF.

    The voltage should be above 0.68V and below 0.18V at least once during this procedure  .

    Fig 2: Checking Voltage Between ECM Terminals 55, 74 And Ground
    G08170502Courtesy of NISSAN NORTH AMERICA, INC.
  8. If NG, replace heated oxygen sensor 2. Refer to "EXPLODED VIEW ".
CAUTION:
  • Discard any heated oxygen 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 oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.
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