2003 Expedition (100k miles). Just replaced the PCV hose last month due to a hole. I replaced 2 O2 sensors too............. Service Engine light came on with a whold bunch of codes

P0443: EVAP Emission Control system purge: Valve C Fault

P0446: EVAP Emsissio Control system Vent Circuit Malfunction

P0135: 02 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)

P0155: 02 Sesnsor Heater Circuit Malfunction (Bank 2, Sensor 1)

P2195: Sensor Stuck Lean (Bank 1, Sensor 1)

P2196: Sensor Stuck Rich (Bank 1, Sensor 1)

P2197: Sensor Stuck Lean (Bank 2, Sensor 1)

P0403: EGR Flow Circuit Malfunction


Also, The AC is blowing warm air only. not sure if that is related to something above, or it just needs a re-charge for refigerant.

 

There are three seperate groups of faults.
1. Evap.
2. Ox sensors.
3. EGR.
My feeling is; did you use the right parts for the OX sensors? The ox sensors have a heating problem. Wiring or the wrong parts?
Did you disturb something around the Evap system?
Did you disturb something in the vacuum lines that operate the EVR?
Better take a close look at everything.

 

Thanks for the reply,

I did use the right O2 sensors.

The passenger side one was a pain in the butt though. I could hardly get to it. Maybe it loosened up (due to not tighening it enough.......it was really hard to tighten due to only being able to turn the wrench a 1/4 at a time) or possibly the wires melted due to touching the exhaust


It's been running for a month just fine since I replaced the sensors though.

Where is the EVAP system located ???? I checked for loose wires and vacuum leaks but didn't see anything. I don't think anything has been distrubed either unless it came loose on its own.

 

WOW!! First time I seen this .. Sorry no help. I don't know how you the passenger side O2 off and on - tried and tried , No dice!! , just glad it wasn't bad lol..

Good Luck