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post #1 of 2 Old 11-25-2009, 07:16 PM Thread Starter
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Got a scanner and some questions...

I got a scanner at Costco for 90.00, plugged it in and now I have some questions, the manual is less than helpful. It's an Innova 3100 CanOBD2.
It shows a KOEO and KOER test, what are these and how I do it?

It also shows what seems to be some stored codes:
PO475 - Exhaust pressure control valve
PO344 - CPS sensor A circuit intermittant. Bank 1 or single sensor
PO340 - CPS A circuit Bank 1 or single sensor

Seems like my CPS may be bad...again?

I tried to clear the codes but they would not clear. Ideeas?


99 F350 Crew Cab Long Box 4X4
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post #2 of 2 Old 11-26-2009, 08:04 AM
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KOEO- key on engine off
KOER- key on engine running
the koeo just requires the key to be in run and the scanner should do the rest, the koer is just as easy and the scanner will prompt you to start the engine. It will idle up and down and cycle a few other things during these tests.

I think in the koer the ebpv functions/tests so you should listen for that. I can't remember if I had that exact code but there is a tube on the passenger side head that leads to the ebpv sensor that gets soot packed and the sensor and tube can be cleaned to hopefully eliminate that problem. The CPS is a common problem and if you have not had Ford do the recall yet go do it. Your codes may not be clearing because they are hard faults which means on initial system check the pcm is recognizing a problem so it could be a wiring problem or a bad sensor, or you are just not operating your new scanner correctly! Try and read up some more on it and let us know if the problem persists...Is the truck running funny (stalling, missing, etc.)? If it's chilly out (like under 40F) can you hear your exhaust back pressure vavle operating until you reach good running temp.?

02 F250 XLT 4x4 Auto w/4in full exhaust, 33x13.5x17's, 2.5 level, daily driver
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