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P1622 Oxygen Sensor Hi Fault #14733783 04/01/20
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MM879 Offline OP
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Has anyone ever had an intermittent oxygen sensor fault? I had one today and one hour later after a restart everything is good.

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Re: P1622 Oxygen Sensor Hi Fault [Re: MM879] #14733814 04/01/20
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flintlocke Online Content
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Did you clear the code or did it do it itself? If you cleared it, I hate to say it, but it will probably light up again.


guilty of white privilege : for 55 years I had the privilege to get up and go to work...to help feed the folks that wanted to sleep in.
Re: P1622 Oxygen Sensor Hi Fault [Re: flintlocke] #14733894 04/01/20
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Originally Posted by flintlocke
Did you clear the code or did it do it itself? If you cleared it, I hate to say it, but it will probably light up again.

It cleared on its own. I'm looking at sensor performance. The sensor hi fault indicates that the sensor signal is disconnected and the pull-up resistor on the computer a/d is raising the signal to 5v. Possible failure modes are internal sensor failure or open signal circuit to PCM. The wiring looks good.

Re: P1622 Oxygen Sensor Hi Fault [Re: MM879] #14733954 04/01/20
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Are we talkin' O2 sensor or MAP sensor?


guilty of white privilege : for 55 years I had the privilege to get up and go to work...to help feed the folks that wanted to sleep in.
Re: P1622 Oxygen Sensor Hi Fault [Re: flintlocke] #14733978 04/01/20
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Originally Posted by flintlocke
Are we talkin' O2 sensor or MAP sensor?

O2 sensor, left upstream 1:1

Last edited by MM879; 04/01/20.
IC-A

Re: P1622 Oxygen Sensor Hi Fault [Re: MM879] #14734024 04/01/20
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Replace it.

Re: P1622 Oxygen Sensor Hi Fault [Re: MM879] #14734041 04/01/20
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flintlocke Online Content
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Oops, sorry. I was thinking p0622 universal code, p1622 is manuf specific, I'm clueless. Left bank sensor 1, since it won't cost anything, unplug it if it's easy to reach and disconnect the battery, 5 min reconnect, the mother ship may recalibrate the sensor values on it's own depending on make and year? If it goes out and stays out, go buy a lottery ticket.


guilty of white privilege : for 55 years I had the privilege to get up and go to work...to help feed the folks that wanted to sleep in.
Re: P1622 Oxygen Sensor Hi Fault [Re: MM879] #14734168 04/01/20
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I got a feeling that the OEM forgot to use gold terminals on the harness side. The mileage is O2 sensor mid-life. The sensor shouldn't be bad yet. The engine doesn't have any running issues. I'll take a look at the harness side female terminal with a USB microscope and see if I can identify any gold flash. Removing and installing the connector should be enough to wipe the terminal contacts.

Re: P1622 Oxygen Sensor Hi Fault [Re: MM879] #14734442 04/01/20
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I think I have that on my corvette. I replaced sensor 3 times with delco and off brands. I can't get it cleared. I had it in the shop 10 times, no go.


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