Good evening gents,

So ive had this check engine light on my 99 SC400 since i bought the car and i finally decided to do something about it. Took it to my mechanic to pull the code and its the code for the Bank 1 Sensor 1 Heating Circuit (aka O2 Sensor). Looked it up online and a denso unit cost me $20 so i figured what the hell. Had the sensor replaced and the code was cleared but it came back after about 5 minutes of driving. Someone suggested i check and see if the fuse for the sensor is bad along with it which brings me to my issue.

Does anyone know where the fuse for the O2 Sensor is? Any help would be appreciated it.
Also if anyone has any ideas as to what else could be causing this issue, id be happy to listen to that as well.

As a side note, i wasnt sure if this thread should be posted in the main section or the maintenance section so mods feel free to move it accordingly if needed

Thanks!

 

That code means theres something wrong with the heater circuit(obviously) but you have to think about it and understand the system. Its talking about the whole circuit could be o2 which u replaced, but your new part could require more heat or less than stock to warm the o2 sensor and that could cause the code(unlikly) You could also have a break or short in your wiring of the o2 heater circuit which is more than likely your issue.

Do a visual check of the wiring you can ohm test it from the terminal at the ecu and the terminal of the o2 connector to verify continuity

 

Hmm, I suppose its worth checking. Do you happen to know where those terminals are?
Also i would still like to check the fuse first since that would be the easier of the two.