The squealing leads me to believe something has locked up and the belt is slipping (which could cause a power loss), so check that all accessories are turning when the engine is running. Always protect your eyes in case something breaks. Next, the PO420 deals with catalytic converter. Check to make sure it is not plugged. That will cause a huge power loss. The PO440 is an evap code. I don't think that has anything to do with a power loss. However, you should have the evap system fogged to determine where there is a leak. The PO1133 is a code for the heated O2 sensor. The interesting thing about this is it could have set the PO420. Last, the PO1404 is dealing with the EGR (closed pintle position).
So where do we start. First, remove the EGR and clean all carbon from the valve itself and make sure the ports in the intake that where it bolts are open and not clogged with carbon. See if that makes a difference in power. Next, you need a scanner that will read live information. You need to check the O2 sensors while they are working. They should show between.35 volts and.55 volts. If they are beyond that in either direction, they need replaced. If they are good, then the catalytic converter is most likely bad. You can try disconnecting the cat to see if the power is restored. If it is, the converter is spent. It will be a loud ride to test, but if you have no scanner, that is one way to check.
Tuesday, January 18th, 2011 AT 9:03 PM