P0153 Citroen HO2S21 Sensor Circuit Slow Response

Possible causes

– Faulty Front Heated Oxygen Sensor Bank 2
– Front Heated Oxygen Sensor Bank 2 harness is open or shorted
– Front Heated Oxygen Sensor Bank 2 circuit poor electrical connection
– Inappropriate fuel pressure
– Faulty fuel injectors
– Intake air leaks
– Exhaust gas leaks

Tech description

Replacing the Front Heated Oxygen Sensor Bank 2 usually takes care of the problem.

What about the obd code?

The response of the voltage signal from the sensor takes more than the specified time.

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)
– Possible higher than usual fuel consumption

P0153 Citroen 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.