I just pulled these codes off my truck, Wondering if there is a fuse for the heater circuits on the 02's? Or could this be a possible tune problem? (In the process of getting updated tune)

P0135 Oxygen Sensor Heater Circuit Bank 1 Sensor 1
P0141 Oxygen Sensor Heater Circuit Bank 1 Sensor 2
P0155 Oxygen Sensor Heater Circuit Bank 2 Sensor 1
P0161 Oxygen Sensor Heater Circuit Bank 2 Sensor 2

 

Don't have my laptop here with me, but I am 99% sure I have those disabled in my truck. I have longtubes and it would set those codes very intermittently, mostly while at light throttle cruise at highway speeds.

 

Most likely an issue with wireing or ground. It's not a tune issue. I would bet that there is a common ground and it's not touching bare metal somewere. Its possible the ground to the Block Or chassis needs to be cleaned. Insuffecint grounds can cause some of the weiredest issues. I know you painted that block so were the main grounds are attached make sure the paint is removed. if it does not make good contact it will have alot of resistance. Some time this causes a system to shut down and not work or like in this case show that there is an issue with its circuit.

 

I cleaned up all of the ground points on the block, but I'll go over them again later on.

 

Update:

Still getting these codes. I have checked all of the wiring and grounds and everything looks fine. Pulled up freeze frame data from the codes and they are setting right at cold start up. I have cleared the codes and they take about 3 or 4 days to come back. I have also checked both fuses and checked each sensor individually, everything still looks fine.

 

I have read that you can get these codes as the result of headers from the o2s not heating up but i never had this issue on my truck. Our 99 obs tahoe will throw a code for one of the sensors but it only does it in the colder months and not in the summer. It just popped back up a few days ago.

 

Bump>>>

 

It could be tune related if you not getting enough spark or tooo rich of a mixture.

 

What's the deal all the sudden all these o2 heater problems........

 

I know a guy that knows a guy with EFI Live... Maybe we should just disable the heater codes.... Check with Justin first and make sure it won't affect anything else.