Engine-Codes - Suzuki - P0158 SUZUKI

P0158 SUZUKI - HO2S Circuit High Voltage Bank 2 Sensor 2

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents

P0158 SUZUKI Possible Causes

  • Faulty Heated Oxygen Sensors (HO2S) Bank 2 Sensor 2
  • Heated Oxygen Sensors Bank 2 Sensor 2 harness is open or shorted
  • Heated Oxygen Sensors Bank 2 Sensor 2 circuit poor electrical connection
  • Faulty Engine Control Module (ECM)

How is the P0158 SUZUKI code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

What is the cost to diagnose the P0158 SUZUKI code

Labor: 1.0

The cost to diagnose the P0158 SUZUKI code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.
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Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P0158 SUZUKI Meaning

The Heated Oxygen Sensors (HO2S) are used for fuel control and catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content of the exhaust stream. When the engine is started, the control module operates in an Open Loop mode, ignoring the HO2S signal voltage while calculating the air-to-fuel ratio. The control module supplies the HO2S with a reference or bias voltage of about 450 mV. While the engine runs, the HO2S heats up and begins to generate a voltage within a range of 0-1,000 mV. This voltage will fluctuate above and below the bias voltage. Once sufficient HO2S voltage fluctuation is observed by the control module, Closed Loop is entered. The control module uses the HO2S voltage to determine the air-to-fuel ratio. An HO2S voltage that increases above bias voltage toward 1,000 mV indicates a rich fuel mixture. An HO2S voltage that decreases below bias voltage toward 0 mV indicates a lean fuel mixture.
The heating elements inside each HO2S heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter Closed Loop earlier and the control module to calculate the air-to-fuel ratio sooner.
The Diagnostic Trouble Code (DTC) will set if the Engine Control Module (ECM) detects that a secondary HO2S signal voltage is more or less than 60 mV for greater than 4 seconds of for a cumulative of 50 seconds.

More Information

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