Possible causes

– Faulty Front Heated Oxygen Sensor Bank 1
– Front Heated Oxygen Sensor Bank 1 harness is open or shorted
– Front Heated Oxygen Sensor Bank 1 circuit poor electrical connection
– Inappropriate fuel pressure
– Faulty fuel injectors
– Intake air leaks may be faulty
– Exhaust gas leaks

Tech notes

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

When is the code detected?

The voltage from the sensor is constantly approx. 0.3V.

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)
– High Fuel Consumption
– Excessive Smoke from Exhaust

P0134 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.

P0134 Information for specific makes

P0134 SUZUKI
P0134 HYUNDAI
P0134 ACURA
P0134 HONDA
P0134 BUICK
P0134 ISUZU
P0134 KIA
P0134 LEXUS
P0134 SCION
P0134 TOYOTA
P0134 MAZDA
P0134 MITSUBISHI
P0134 SUBARU
P0134 AUDI
P0134 VOLKSWAGEN
P0134 NISSAN
P0134 INFINITI
P0134 CHRYSLER
P0134 DODGE
P0134 JEEP
P0134 CADILLAC
P0134 CHEVROLET
P0134 GMC
P0134 PONTIAC
P0134 SATURN