[Jason@DSG]

Originally Posted by DViper0020

Hey guys, I'm new to the forum, but I joined because I'm looking into possibly buying an Fr-s. However, this Fr-s has an issue that I'd like to get some opinions on. Before I get into the issue, here are some details:
13 Fr-s
6 speed manual
11,000 miles
Rebuilt title (it was in a front end accident)

Now for the issue, aside from the battery not holding a charge, the car has an error code of P0171 "System too lean bank 1," from some of the research I did on this forum/around the internet I'm reading that it could be that the primary o2 sensor is bad. If it is the o2 sensor, I'm not all that concerned, but the car is really loud above like 1000 rpms. It almost sounds like an exhaust leak right at the manifold, but I kinda feel like I'd hear it at idle too. Also when I did drive it, it didn't want to stay idling at stop signs (which I figured could just be from the o2 sensor), but it also felt somewhat sluggish. I don't know if this is just because I'm used to the acceleration of my twin turbo 350z, or if it's because of the possible exhaust leak/sensor issue.

So do you guys think there's a bigger issue here, or is an exhaust leak/o2 sensor the culprit?

My two cents. Unless you're getting it for a REALLY good deal, sounds like an engine rebuild/reassembly needs to be done. Sounds almost like an oil pressure issue, maybe a car that had FI on it before.