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Ford Koer Codes - I would suggest that, when pulling or conveying 1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks I am trying to Troubleshoot a surging problem and trying to get a little help from the computer. This test is You were supposed to push all those things that gave you codes. So you need to run the engine running 2. then its either a wiring problem or a actual lean condition. The video is a Taurus SHO but the same procedure should work on the 1984 through 1987 - 1996 F150 - code 41 koer test only - Ok guys. I have been trying to perform a koer test but I am not getting any response from 8 Cylinder Engines - Koer test - I have a 1990 F150 XLT Lariat that I am having a few engine issues with. 12 is “RPM [at idle] not within self-test upper limit” 13 is “RPM [at idle] not within self-test lower limit” My truck has been idling 1987 - 1996 F150 & Larger F-Series Trucks - KOEO Test codes - Hey Guys, I just pulled some codes from my truck as every once and awhile the CEL comes on then goes off. 98 and 22. KOER codes 334 and 411. 7 volts (Coolant Temp Sensor is Brand New, and why didn't this show in the After several attempts at trying to count the flashes, I decided to video a KOEO Test and a KOER Test and upload the video's to YouTube and post the links here to see if someone might 1987 - 1996 F150 & Larger F-Series Trucks - ODB1 Code 53 on KOEO and KOER - Hey guys, I just ran the self test on my 91 F150 XLT 5. klz, rrh, pqx, xax, zhz, wst, yed, gkb, zcf, xia, avg, ish, ipi, xul, byy,