I noticed that my egr plug fell off but no check engin lights on the dash. I was still wondering if there was a code in there so pulled out my OTC Stinger 3769 code reader. Pluged it up like I have many times on the old Ranger. Hit the link button and it 'read's for about 10 seconds then just displays 'err'. Tried this a few times, power off/on, remove batteries, unplug/replug, etc. Nothing, always just the error display.

After about 15min I break down and pull out the book. Under the vehicles covered section it says "All 1996 and newer vehicles (cars and light trucks)...". I try it on the old Ranger and it works, my 250 is not exactly a 'light truck'. The book also says to look for the VECI label and make sure it is "OBD II Certified" but I can not locate that label.

Should the simple OBD II readers work on an '05 F250 or do I need to get a new reader?