348ts Check Engine 14 Light

Check engine 1/4 light comes on and off intermit.
Checked ECU code 1212, code reads lambda regulation. What is lambda regulation?

Thanks for any input.
Bob

>>What is lambda regulation? <<

Lambda regulation refers to the 02 sensor. Check it's grounding. Some dealers add an external ground to the 02 sensors.

Regards, JRV

Thanks JRV, I'll check it tomorrow.

Best,Bob

Even though it is probably the lambda connection go ahead and clean the slow down ecu connection. (harness)
Sometimes 348s have slow down lights come on from a bad connection at the ECU.
Here is a pic of it.

Thanks, I'll give it try. Didn't have time today for anything will try tomorrow.

Thanks again, Bob

I am having the same problem with bank 5-8 only. Very intermitent and if the light stays on for awhile I usually just need to run the car very hard for it to go off. Also this seems to happen mostly when the car is cold. I saw the picture above and info on switching the sides to check for a bad ECU. Is this difficult and if not where could I get instructions to help me with the switch. Thanks so much.