1998 Ford Mustang Codes P0171, P1131

DSAVAGE21

MEMBER
1998 FORD MUSTANG
3.8L
V6
RWD
MANUAL
150,000 MILES

I'm trying to narrow down the list of solutions for the problem with my 98 Mustang,
Says Too lean on bank 1
I Have already checked for vacuum leaks and none were found,
I replaced spark plugs and wires.
I don't know if I should look at the (MAF), o2 Sensors, fuel injectors, fuel pressure.

2 Replies

OBXAUTOMEDIC

MECHANIC
3,711 POSTS

Hello,

Ok, been looking through my info to find the underhood fuse box to locate the Heated O2 Sensor fuse but cannot seem to find one that show it. So, check the fuses in the underhood fuse box for blown fuse, I want to say is a (Blue)15 amp fuse. Had customer few years ago who had same codes changed his O2 sensor and cleared codes same codes popped up within 5 mins called me went and checked it out found that they were heated sensor so they were fused also. Anyway found 15 amp fuse blown replaced and fixed problem.

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Wednesday, February 19th, 2014 AT 6:51 PM

HOMER1967

MECHANIC
875 POSTS

How did you check for vacuum leaks?Are there any exhaust leaks?Check the air filter for a restriction.I would also suggest that you check your fuel pressure. Do you have a scanner that will show live data? If you do I can tell you what to look for as far as the maf and baro go.

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Wednesday, February 19th, 2014 AT 7:22 PM