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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 501 (Engine Control System (DTC/Circuit Diagnosis) (2 Of 3)) >> DTC/Circuit Diagnosis >> DTC P0157: Ho2S2 >> DTC Description >> DTC Detection Logic

DTC Detection Logic

WARNING: This page is about a different car, the 2019 Nissan NV3500 HD, 2019 Nissan NV2500 HD, and 2019 Nissan NV1500. However, it is still accessible from the selected car via links, so may be relevant.

The heated oxygen sensor 2 has a much longer switching time between rich and lean than the air fuel ratio (A/F) sensor 1. The oxygen storage capacity of the three way catalyst 1 causes the longer switching time. To judge malfunctions of heated oxygen sensor 2, ECM monitors whether the maximum voltage of the sensor is sufficiently high during various driving conditions such as fuel-cut.

GNSJSBIA4446GB-446Courtesy of NISSAN NORTH AMERICA, INC.

SYMBOL

: 0.70 V

DTC No.

Trouble diagnosis name

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P0157

HO2S2 (B2)

[Heated oxygen sensor 2 (bank 2) circuit low voltage]
  • The maximum voltage from the sensor does not reach the specified voltage.
  • ECM detects the heated oxygen sensor 2 circuit is short to ground.
  • Harness or connectors

    (Heated oxygen sensor 2 circuit is open or shorted)

  • Heated oxygen sensor 2
  • Fuel pressure
  • Fuel injector
  • Intake air leaks
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