There really isn't a fuse just for the O2 sensor heater circuit because all the information to and from come and go from the vehicle computer (PCM). Guessing the check engine light is on and your getting a diagnositic trouble code (DTC) saying you have an open circuit or something dealing with the O2 sensor heater circuit. In the picture above I have marked the main ground for both upstream and downstream oxygen sensors. I would start by cleaning that ground real well and making sure you have a good connection. Not exactly sure of your problem but like I said before about the open circuit DTC that's all I can think as far as helping you until I have more information. But there isn't a set fuse just for the oxygen sensor circuit....
Yes, I am getting a CEL for O2's 1/1 & 2/1 stating heater circut failure, P0135 1/1 but I can not remember the one for 2/1 but it is the same code discription. I have also tried new O2 sensors and cleared the codes, but they come back on within 10 miles. I did find a cracked right side exhaust manifold and replaced it, but codes are still there and will not quit from coming on. I can not think of anything else besides grounding issues. Am I on the right track?
Yes you're on the right track. I'm leaning towards the ground myself as they share a ground. If you want to check the heater control circuit and you have a volt/ohm meter you can do the following: At the O2 sensor for bank 1 sensor 1 (1/1) unplug it. At the PCM you can carefully disconnect the orange connector on the PCM. There should be numbers on the terminals. At terminal #18 on the orange connector which should be a brown wire with a light green stripe, check the resistane from the same color wire at the O2 connector. The rsistance from the O@ sensor to the PCM should read .5 ohms or less. You can do the same test for your ground as well. The color for the ground to that ground connector at the O2 sensor will be the black wire with a light green stripe. I cannot post pictures now when just commenting on here for some reason so can't post anymore pictures. If you would like pictures of the connectors and or need any more testing procedures, feel free to email me directly at [email protected] and I'll be happy to give you pictures and stuff.
Oh yea...Your truck doesn't have Clifornia emissions does it?
No i am in Va. Thanks for the info. I originally had a bank 2- sensor #2 CODE. So i bought & changed all the O2 sensors. Thinking that with 172,000 miles it would be a good idea. WELL I STARTED WITH the back passenger ( bank 2-#2) & when i got to the last one (bank 1-#1) the connector did not fit. So i then cut the connectors off the old & new and put the old matching connector on the new sensor. Then i had codes of both back sensors + a miss. I decided to put the old sensors back & that was worse . So now i have put the new sensors back except for the Bank 1-#1, which i left the one that i sliced off & used the old one from the other front. Now it is running good, but still have the same code (P0161) Bank 2 #2. YOUR HELP ALONG WITH Auto Zone got me to this point. I will check that ground and all connections toomoro. Thanks again.r
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I have herd of this problem before. One solution is to try and find gas with no ethonol in it or get the super unleaded.
SOURCE: Where is the o2 sensor on a 1500 dodge ram 1500
On most newer vehicles, there are either 2 or 4 sensors. There should be at least 1 upstream sensor between the engine and convertor, and the other one is down stream after the convertor.
Vehicles with dual cats or dual exhaust sometimes have a pair for each side. Look near the convertors..........
SOURCE: My 2004 Dodge Ram 1500
faulty O2 sensors will throw a lot of things out of whack so start there, allow diagnostic reboot, drive and check codes again...
SOURCE: I have a 2004 dodge ram 1500 with hemi 5.7. The
Hi!!
The O2 sensor for Bank 1 is located below left front of transmission, in exhaust. Check diag. below.
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SOURCE: locate o2 sensor bank1 sensor1
Depending on what type exhaust you have ( dual or single) you will have
several oxygen sensors. The bank # XXXXX means it is one of the o2
sensors on drivers side. The sensors are located screwed directly into
the exhaust pipe at different spots. See below. You will have say sensor
1/1 which means sensor 1 / bank 1 etc.. 
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