>I cleared the PCM codes (PCM1139)
P1139=Heated Oxygen Sensor>insufficient switching bank1 sensor 2
Whether or not your SES light is a 'cry wolf' I can't tell you. I'm not
that conversant with the OBDII protocols. When the SES on my car has
illuminated, I've always had an EGR code. Although I took it off (EGR
valve) and cleaned it, I continue to see the SES on occasions and still
have the same code set as an 'intermitant'. The lamp goes off at the
next key-start, so I've since quit worrying about it.
In your case with the 1139 code, although it says 'sensor', I'd first be
looking at the circuit itself before blaming the sensor.
This probably doesn't help much, but maybe you can find a clue.......
Dave S(Texas) >> Stay informed about: how to reset computer on 96 DeVille????