I just keep getting system too lean codes PO172 and 174

 

What do you think could be causing this. Is it a tuning issue

 

When I had the P0172 code, I tuned the VE table and that took care of it.

 

How damaging is it to drive it till Allen gets me a new tune in the mail.

 

Just drive it like your gradpa would and you should be ok for a few days. Getting in it hard is a bad thing.

 

Thats what I have been doing. I put the stock MAF back on and wrapped the air filter to restrict the air. I thought this would help with the a/f ratio and hopefully richen things up abit. The code hasn't come back yet.

 

well that after market maf allways messed up my tune.

 

The code came back this morning. After I removed the MAF and put the stock MAF back on. The last few times that I cleared the code it only had bank 2 too lean. What could cause only bank 2 going lean and not the other.

 

bad O2 sensor

 

Bit which one. The front left or right or the back left or right. What is the job of the back two and the job of the front two.