Faulty Antipollution P0134 Oxygen Sensor Replacement.
This video demonstrates one possible scenario for the P0134 faulty antipollution error. A troubleshooting process is also shown. The video is long - if you're impatient, please rewind.
A sensor with a part number for a Citroen Berlingo was used. At the time of purchase, this sensor was cheaper than the one recommended for the Citroen C4. The sensors differ in wire length.
Measurement parameters:
White wires (sensor heater) - resistance from 10 to 40 ohms.
Resistance between the gray and black wires is measured in megaohms - 1.000 (infinity).
Oxygen sensor reference voltage - 4.5-4.6V
Sensor heater reference voltage - 3.5-3.6V
Before installing the sensor in the exhaust manifold, it is necessary to repair the threads with a tap.