Engine-Codes - Toyota - P0038 2009 TOYOTA PRIUS

P0038 2009 TOYOTA PRIUS - Oxygen Sensor Heater Control Circuit High Bank 1 Sensor 2

Repair Importance Level: 2/3
Repair Difficulty Level: 2/3  What is this?
Table of contents

P0038 2009 TOYOTA PRIUS Possible Causes

  • Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2
  • EFI relay (integration relay)
  • Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 harness is open or shorted
  • Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 circuit poor electrical connection
  • Faulty Engine Control Module (ECM)

How is the P0038 2009 TOYOTA PRIUS 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.

Tech Notes

Check EFI relay (integration relay) before checking or replacing the oxygen sensor

What is the cost to diagnose the P0038 2009 TOYOTA PRIUS code

Labor: 1.0

The cost to diagnose the P0038 2009 TOYOTA PRIUS 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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When is the code detected?

The P0038 is set when the ECM detects an excessively High voltage through the heated oxygen sensor heater circuit

Possible Symptoms

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

P0038 2009 TOYOTA PRIUS Meaning

Oxygen Sensors (O2S) or Heated Oxygen Sensors (HO2S) need to reach a minimum operating temperature of 750 degrees F to produce an accurate voltage signal. The faster the heated oxygen sensor reaches that temperature the faster the sensor will start sending an accurate signal to the Engine Control Module (ECM).
In order to achieve the require temperature, a heater element is included inside the heated oxygen sensor. The ECM controls the heated oxygen sensor heater element based on signals from the engine coolant temperature and engine load. The ECM controls the heater element circuit by allowing current flow to ground.
The ECM monitors the voltage signal received through the heater element circuit and determines the state of the circuit by comparing the voltage detected with the factory specifications.

More Information

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