SES Light - OBD Codes

As suggested here, I bought a scanner and hooked up to my OBD port. There were 2 codes in memory: 0137 and 0141. The SES light stays off for a while, then intermittently comes on and stays on for longer periods of time. Eventually, it is on all of the time. After I erase the codes, the light remains off again, with the cycle starting over. Any suggestions?

Thanks!

Both DTCs are related to the post CAT convertor 02 sensor. A low volts and heater malfunction. Check the electrical connector to it first. Then replace the rear 02 sensor. Try to stay with the AC Delco brand, PN: AFS 141.

Thanks! I'll give it a try.

One other thought on this. If the problem is not corrected will it cause damage to the engine?

The post 02 sensor justs monitors CAT convertor efficiency but should not affect anything else but if it has a short may load down the PCM 5 volt reference signal or the 12 volts supplied to the 02 heater circuits. I don't think there will be any engine damage as a result but you never know for sure.

Got it. Thanks!