P1134 HO2S Transition Time Ratio Bank 1 Sensor 1

OBD-II Code P1134: This code indicates that the Powertrain Control Module (PCM) has detected a problem with the transition time ratio of the Heated Oxygen Sensor (HO2S) located in Bank 1, Sensor 1. The sensor is not switching between rich and lean conditions as expected.

p1134 – HO2S Transition Time Ratio Bank 1 Sensor 1

Typical Severity: Moderate

Common Causes

P1134 – HO2S Transition Time Ratio Bank 1 Sensor 1

Common Causes:

• Faulty oxygen sensor (bank 1, sensor 1)
• Vacuum leaks in the intake manifold
• Exhaust leaks near the oxygen sensor
• Fuel pressure too high or too low
• Engine misfire condition
• Faulty fuel injectors
• Issues with the wiring or connectors related to the oxygen sensor

 

Common Misdiagnosis

OBD2 Code: P1134

Description: HO2S Transition Time Ratio Bank 1 Sensor 1

Common Misdiagnosis: Replacing the oxygen sensor without checking for vacuum leaks or exhaust leaks that may affect the sensor’s readings.

 

Common Diagnostic Steps

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OBD2 Code: P1134

Description: HO2S Transition Time Ratio Bank 1 Sensor 1

• Verify the code with an OBD-II scanner and clear it to see if it returns.
• Inspect the wiring and connectors for damage or corrosion near the oxygen sensor.
• Check for exhaust leaks before the sensor that could affect readings.
• Test the oxygen sensor’s voltage output using a multimeter to ensure it’s within specifications.
• Examine fuel pressure and injectors for proper operation, as they can influence sensor readings.
• Look for vacuum leaks which might cause incorrect air-fuel mixture readings.
• If all else checks out, consider replacing the oxygen sensor if it’s faulty or aged beyond its service life.