Something I should have said in my first post was that I know the definitions, but I have found more than one for each code.
181 Right side still lean, at richest adaptive limit, during part throttle. (From fordfuelinjection.com)
181 Fuel system mixture too rich-check EGR valve(From the Haynes manual)
181 HEGO sensor-voltage signal not switching: Indicates "lean" during part throttle engine operation(from the Actron manual for my scanner)
336 EVP or DPFE circuit voltage above maximum voltage with zero EVR duty cycle. (From fordfuelinjection.com)
336 PFE sensor signal is high - ">PFE. (From troublecodes.net)
336 Exhaust gas pressure too high. (From the Haynes manual)
336 PFE sensor or EGR pressure Transducer - signal voltage higher than expected (exhaust pressure high). (from the Actron manual for my scanner)
There all pretty much the same, but at the same time a little different. Especially the 181 code, (i'm guessing that I shouldn't trust the Haynes manual!). Is code 336 saying that the sensor is bad, or that the exhaust backpressue is so high it can't read it? I'm going to search the board on how to check the DPFE.
