DTC P0134 Oxygen Sensor Circuit No Activity Detected (Bank 1 Sensor 1): Description

The heated oxygen sensor (HO2S) located on the front of the catalyst converter is used to control the fuel trim.

Refer to the description of DTC P0130 for detailed information (see ).

DTC DETECTION CONDITION CHART

DTC No.	DTC Detecting Condition	Trouble Area
P0134	HO2S voltage (bank 1 sensor 1) does not exceed 0.45 V while intrusive closed loop with short-term fuel trim is 18% or more for 15 seconds (2 trip detection logic) Intrusive closed loop runs when all of the following conditions are met for 20 seconds: Driving at 40 km/h (25 mph) or more Not idle HO2S voltage is less than 0.45 V	HO2S (bank 1 sensor 1) Fuel pressure Air induction system Ventilation hose Ventilation valve Injector Exhaust gas leakage
P0134	(b) With warm engine, Heated Oxygen (HO2) sensor (bank 1 sensor 1) output does not indicate rich (more than 0.45 V) even once when conditions (1), (2), (3), (4), (5) and (6) continue for 30 seconds or more (2 trip detection logic) After detection condition (a) is determined to be normal Engine running Engine coolant temperature more than 75°C (167°F) Throttle valve not fully closed Fuel system status is closed loop Short-term fuel trim is 18% or more

HINT:

If this DTC is set, check the output voltage of the HO2 sensor (bank 1 sensor 1) by entering the following menus on the intelligent tester: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / O2S B1S1.