Discuss 92 5.0 code 91?? on AllFordMustangs.com, the place for Mustang enthusiasts.
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Hi ive got a 92 with a 331
Driving tonight engine light came on, when i got home i did koeo test, and got codes 15 (i have a chip) and code 91. i cant find my code list and when i searched online i found a bunch of different listings for 91. so can anyone tell me what 91 really means. And any ideas on how to fix
Well, if I were a woman I'd say put some black tape over it and bam it's fixed! LOL, but I'd give your dealership a call if I were you. Or maybe O'Reilly's also. I think there is a deal on here somewhere that has all the code listings, if I find it I'll post it here for you.
( Carter ) 1993 Mustang GT - "Blackie" - The go-getter.
1991 LX 2.3 5 Speed Hatch - Family Mustang
1969 F-100 390 4 speed - Project Rustoleum
Summit Racing and Latemodel Restoration Supply have brought me this far, my imagination will bring me all the way.
93 GT W/blown up aod
4R70W with fully manual vb swap underway also switching to 3.27 gears
70mm turbo, Stock heads/cam, explorer intake, 75mm TB, 3" pro tube maf, 42lb injectors, Walbro 255lph fuel pump, 3g alt upgrade, single 3" pipe with a race bullet dumped at the axel, Full Length sub-frames, 3.73s, Taurus Electric fan W/ DCC Controller, UPR control arms, 17x9 03 Cobra wheels with 245/40's up front and 275/40 nitto NT05R's in the rear. YOUTUBE Channel is Pedrorules08, Check out my vids!
it could possibly be the o2 wiring, not just the sensor
quick way to check it is swap the o2 sensors..put the right side on the left pipe, and vice versa..plug them in and run the codes again..if you now get a code 41 and the 91 is gone, then its the sensor..if you still have the 91, then its wiring...
1987 Notchback - N/A stock 302, TFS heads, Holley Systemax, FTI cam, Astro A5 Best so far: 10.92 @ 123mph with a 1.49 60ft