PO156 Code!! Help!

[98expy98]

Hello! i am new to the forum. Its been SUCH a help already!

okay, so i bought a 1998 expedition xlt 4.6 about two weeks ago. the CEL was on, got the codes off, and saw that it was one of the CO2 sensors, So i ran down to the parts store picked one up and threw it in. cleared the codes and everything went well. About 10 miles later the CEL came back So i checked the codes and yet again it came up P0156 Bank 2 Sensor 2. I crawled back underneath and double checked that it was tight and that the plug was securely in its home, in which it was. So the code is still on and i replaced the sensor as it said it needed replacing. I have also noticed that it has a very slight vibration at idle with a small amount of acceleration. Not sure what to do next and i am hoping to suck some knowledge from you fellow expy enthusiasts. Thanks In Advance

 

[jbanks]

code po156,will not go away. - Ford F150 Forum

Looks like, Exhaust Leak, Messed up Wiring or bad PCM are options

 

[bedrck46]

Just to make sure as I have noticed some confusion as to which side is Bank 1 and Bank 2
Passenger or Driver side.
Which side did you change??

 

[98expy98]

Passenger side after the cat??

 

[bedrck46]

Bank 2 sensor 2 is the drivers side after the cat

 

[98expy98]

And i have checked all around the exhaust system and it has no leaks to be found.

 

[bedrck46]

but it appears you changed the wrong sensor

 

[98expy98]

NO WAY!! I called my local ford dealership, and the parts manager assured me it was the passenger side

 

[98expy98]

i will replace the driver side sensor and let you guys know. Thanks

 

[bedrck46]

seems as if you doubt me Google it and see what comes up at least double check