AutoCodes – Scion – P0134 Scion

P0134 Scion Code - Oxygen Sensor Circuit No Activity Detected (Bank 1 Sensor 1)

Quick Answer

The front heated oxygen sensor (or O2 sensor 1) is placed into the exhaust manifold. Common causes include HO2S (bank 1 sensor 1), Fuel pressure, Air induction system. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: P0134 Scion indicates Oxygen Sensor Circuit No Activity Detected (Bank 1 Sensor 1).
Common causes: Common causes include HO2S (bank 1 sensor 1), Fuel pressure, Air induction system.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 8,521

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
Comments
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Code P0134 Scion Description

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.

OBDII Code P0134 Scion - Oxygen Sensor Circuit No Activity Detected (Bank 1 Sensor 1) - AutoCodes.com — P0134 Scion Code - Oxygen Sensor Circuit No Activity Detected (Bank 1 Sensor 1)

What does this mean?

What are the Possible Causes of the DTC P0134 Scion?

HO2S (bank 1 sensor 1)
Fuel pressure
Air induction system
Ventilation hose
Ventilation valve
Injector
Exhaust gas leakage

How to Fix the DTC P0134 Scion?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

Replacing the Front Heated Oxygen Sensor Bank 1 usually takes care of the problem.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0134 Scion code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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Information for Specific Scion Models

P0134 2005 Scion xB — Oxygen Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
P0134 2006 Scion xB — Oxygen Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
P0134 2007 Scion xB — Oxygen Sensor Circuit No Activity Detected (Bank 1 Sensor 1)

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.