forpointsick

i have a 2001 mustang gt. the check engine light has been on a long time because of my X pipe not having cats. I bought a sct tuner and turned of my rear o2 sensers and the light cam back on and i checked it. it was p0171 which is system too lean (bank 1) not sure if it is the tuner or if its been doin this a while and how can i fix it

GTRACER88

1. O2 sensor is out.
2. Vacuum leak... <--- doubt this but if 1st one isn't it then try this.

mustangman281

Bank 1 is the passenger side.

Do you have a K&N filter or other after market filter?

Check for vacuum leaks.

GTRACER88

Actually bank 1 is the drivers.

mustangman281

If you have no clue what your talking about then don't try to give advice or correct me.

All ford engines bank 1 is the same side as cylinder 1.

jvog

Gtracer you seem to be having trouble making friends lol

OzzDOA

Bank 1 is passenger side, check the front O2 sensor on that side.

GTRACER88

Well i had the same problem, same code, and it read bank 1 and i changed the drivers O2 sensor and it corrected the problem. But i have heard that it was passenger side that had bank 1 which was what my mechanic told me after i did the job. I cant explain to you anything else but that. I changed drivers and end of problem. Well then, you explain it then. Why did i get bank 1 sensor and changed the drivers and fixed the problem?

mustangman281

You are probably mistaken on what code you had.

A P0171 lean code for bank 1 is the cylinder bank on the RIGHT (passenger) side of the engine on Ford vehicles with a V6 or V8 engine and rear-wheel drive.

A P0174 lean code for bank 2 is the cylinder bank on the LEFT (driver) side of the engine on Ford vehicles with a transverse-mounted V6 engine and front-wheel drive. This code is not set on four cylinder engines (no bank 2).

http://www.aa1car.com/library/ford_lean_codes.htm

06z28eater

x2 ... my explorer is putting up the same codes, and actually is will not even stay running now!