engine trouble light is on on 2003 GMC Sierra 1500 HD

I have a engine light test guage it comes up as PO0155 02 Sensor Heater Circuit Circuit Malfunction (Bank 2 Sensor1)Can I repair this myself? I need to get the truck a smog test but can't because the engine light is on. I had it smog tested and it failed. Can you help me Thanks Woody

Asked by for the 2003 GMC Sierra 1500 HD
1 answer
Most likely it's that the sensor heater is faulty. I'd disconnect it and check it with a meter before I bought parts. I'd think you should see something between 3 ohms and 15 ohms for a good heater.
PS: good idea to tell us which engine you have in the future.