hey guys, while i was at the part store picking up a part to fix a different issue with my truck, i decided to have it scanned since the CEL has been on.

i wasnt told a code number, and this specific code has came up before but i have no idea what causes this code. it says something about 'heater circuit' i asked the shop that did my motor replacement about it and they had a couple suggestions but nothing seemed to work. they suggested it was related to oxygen sensors, but i replaced the front 2, and it still remained.

any ideas?

 

I got the same deal after pulling my transmission recently. It was the rear drivers side oxygen sensor. If they pulled the exhaust, or knocked it around a bit it seems to upset the sensor or something, cuz that's all that happened to mine for the CEL to come on. Find the specific code and you can look up which side/sensor it is.

I think the Heated sensors are the rear 2 sensors though, not the front. Could be wrong, but again the specific code would tell you.