Anybody see if you have any picture or draw a picture tell me how it work sonce I'm try to understand myself about front and back o2 sensor bank 1 and bank 2. As for my 06 silverado 5.3 have trouble po145 I think it say bank 1 and bank 2 rich.

I remember Allen Nelson did tuned my PCM to cover o2 sensors. Because I run no cat. It should be front o2 sensors cover the tune right?

Need picture for that please?
Bank 1 Sensor 1 - Driver's side before convertor (front)
Bank 1 Sensor 2 - Driver's side after convertor (rear)

Bank 2 Sensor 1 - Passenger's side before convertor (front)
Bank 2 Sensor 2 - Passenger's side after convertor (rear)

 

Im not sure what you are asking...your descriptions of the sensor locations is correct...

 

yes the locate both sensors on front and both others on rears what it call that's why im confused
Let me draw in shortly

 

My engine light keep come back like between 10-15 miles I kept clear code and keep come back say bank 1 and bank 2 rich.

 

Which I have most problem P0175 bank 1 system rich and p0172 bank 2 syste rich. Is that front 02 sensors are bad? I think the rear o2 sensors been tuned deleted since I run catless. I clear the code. Id say about 10-20 miles came back on. I kept doing over and over. I cleaned MAF, new air filter, took 02 sensors out and clean and put back together. Still same. But that's werid if I disconnect battery for an hour. Drive long no engine light until closer 100 miles. Came back. So I use obd2 scan to clear the code. It would keep come back a lot if you drive between 10-20 miles. Makes sense?

Or possible cause gasoline since I been running 93 premium for long time. Now I been run 89 Plus, it might cause engine light on?

 

As today drove around still get engine light back on alot. Is anyone who had experience with same issues. Maybe you can help me to resolve? I'd appericated it. FYI I did research alot on this site about my code troubleshooting and I did following up. Still same

 

is it a Flex Fuel truck?

 

want update with yall. Nelson send me another tune pcm update Now much better no more engine light so far. Due fuel run rich