Engine-Codes - Subaru - P0153 SUBARU

P0153 SUBARU - HO2S21 Circuit Slow Response

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

P0153 SUBARU Possible Causes

  • Faulty Front Heated Oxygen Sensor Bank 2
  • Front Heated Oxygen Sensor Bank 2 harness is open or shorted
  • Front Heated Oxygen Sensor Bank 2 circuit poor electrical connection
  • Inappropriate fuel pressure
  • Faulty fuel injectors
  • Intake air leaks
  • Exhaust gas leaks

How is the P0153 SUBARU 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

Replacing the Front Heated Oxygen Sensor Bank 2 usually takes care of the problem.

What is the cost to diagnose the P0153 SUBARU code

Labor: 1.0

The cost to diagnose the P0153 SUBARU 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 response of the voltage signal from the sensor takes more than the specified time.

Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Possible higher than usual fuel consumption

P0153 SUBARU Meaning

The front heated oxygen sensor (or O2 sensor 1) is placed into the exhaust manifold. It detects the amount of oxygen in the exhaust gas compared to the outside air. The heated oxygen sensor 1 has a closed-end tube made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. The heated oxygen sensor 1 signal is sent to the Engine Control Module (ECM). The ECM adjusts the injection pulse duration to achieve the ideal air-fuel ratio. The ideal air-fuel ratio occurs near the radical change from 1V to 0V.

More Information

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