P0134
Powertrain Codes
P0134 - O2 Sensor Circuit No Activity Detected Sensor 1 Bank 1
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- High Fuel Consumption
- Excessive Smoke from Exhaust
Possible Causes
- Front Heated Oxygen Sensor Bank 1 harness is open or shorted
- Front Heated Oxygen Sensor Bank 1 circuit poor electrical connection
- Faulty Front Heated Oxygen Sensor Bank 1
- Inappropriate fuel pressure
- Faulty fuel injectors
- Intake air leaks may be faulty
- Exhaust gas leaks
When Detected
The voltage from the sensor is constantly approx. 0.3V.
Tech Notes
Replacing the O2 Sensor 1 usually takes care of the problem
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.
Information For Specific Makes
P0134 HYUNDAI
P0134 ACURA
P0134 HONDA
P0134 ISUZU
P0134 KIA
P0134 LEXUS
P0134 SCION
P0134 TOYOTA
P0134 MAZDA
P0134 MITSUBISHI
P0134 SUBARU
P0134 AUDI
P0134 VOLKSWAGEN
P0134 NISSAN
P0134 INFINITI