my o2 sensors arent heating up by themselves. they are bosch widebands, and im wondering, do they have built in heaters? i know there is a 4th wire that is disconnected off one of the plugs off the wiring harness...so i think that all i have to do is connect it to the bosch some how (it doesnt have the 4 wire) im a little stumped here, i guess i just need to know if the bosch widebands have built in heaters. thanks a lot

 

Ryan, stop posting here. You'll NEVER get answers....

 

haha hey theres a lot of guys on here that actually know their stuff. but believe me i get 90% of my tech info elsewhere.