Sorry if this is something basic i am missing, but I'm new trying to learn from here.
My daughter bought a 2006 Fiat Sedici petrol 1.6. Was working fine however the engine management light came on with what i remember was a no. 2 o2 sensor fault. I checked the o2 sensors and with the scan tool it appeared the post cat o2 sensor wasn't moving.
When i physically looked, the O2 sensor was removed from the exhaust and actually cable tied up beside the connector (covered in black tape), and a bolt in the sensor hole.
I fitted a new O2 sensor and everything appeared to be working as normal, but the engine management light came on again with a P0420 code.
I have looked at the videos and tried to follow everything through, and it does maybe appear that the CAT needs replacing, however the car will run fine and the engine management light will stay off for hundreds of miles, then can come on suddenly, not dependent on amount of driving etc.
The main thing that is puzzling me is that if i connect the scanner to the car with the ignition on and with or without the o2 sensor connected i get a 1.37v reading on the scanner. O2 sensor 1 shows 0.00v, i tried the bias testing with a test light as per videos and nothing changes, it stays at 1.37v. With the engine running the PID follows closely pre cat o2 sensor, and has quote a bit of movement.
Before i get a replacement CAT , i want to be sure this is correct.
(it has 4 wires , 2 giving a voltage with only ignition on and sensor unplugged, 12v (battery voltage)and other 1.37v. With the sensor connected it still shows 1.37v
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