P0171 - Fuel Trim System Lean. This is not a fault with any designated components but rather an operational fault which is one that is not easy to list because of the number of possibilities.
P0300 - Engine Misfire detected. Misfiring had been detected and it can be due to possibilities similar to P0171.
We will let the above be first and concentrate on other faults.
P0441 - EVAP system no flow during purge.
P1441 - EVAP system flow during non-purge.
These 2 codes contradict each other and it could be the EVAP solenoid vacuum hoses are interchanged. This could also cause the other codes to be triggerred.
Try reversing the EVAP Purge Solenoid valve vacuum lines and go for a test.
In no way did the codes indicate any O2 problem so I hope you have not tried replacing them yet.
Friday, September 7th, 2012 AT 4:23 AM