Hi guys, just picked up a 2005 s2k with a greddy turbo kit and yesterday while driving it, it threw a check engine light and pulled the code which read p0171 which is running lean on bank 1. I cleared the code and have driven the car quite a few times since then and it drives normal and no check engine light. Some background on this car, it has had the turbo kit installed for 25k miles, so I'm assuming it isn't the tune. Any ideas?
Thanks

 

What engine management is it running? Could be the o2 sensor starting to go out. I'd pull a data log and see how things look to start with.

 

It must be the Greddy ECU as he's getting OBD codes.

 

Yes it is the greedy E-manage ultimate fuel management