BLDTruth

Only 1 - it will be located right before the first catalytic converter. Crawl under the truck on the passenger side by the front wheel and you will see it.

Most shops don't read ODB1 any more - gotta buy a $30 code reader or do the paperclip trick.

f150_wolf

I did the paper clip trick and got three codes:

172, 327, 328.

And using this website to decode: http://www.fordf150.net/howto/eecivcodes.php

172: Lambda Sensor (Right) Too lean

327: Electronic pressure transducer (EPT)/differential pressure feedback exhaust (DPFE) sensor/electronic vacuum regulator (EVR)

328: Electronic vacuum regulator (EVR)

So I'm thinking to start, I will begin looking into how to replace the O2 sensor and the EVR.

Do you guys have any other recommendations when it comes to these codes?

Thanks again for your help.

BLDTruth

Alright before you go dropping money on new parts, I would recommend checking the O2 sensor connector - it tends to get gunked up real good and throw a false code...ask me how I know. I would also recommend replacing all of the plastic vacuum lines with rubber or polyurethane tubing. A lot of the time codes related to the egr/evp are vacuum line related - this is really a must-do with these trucks and only costs $15-30. Many threads about it.

f150_wolf

Thanks a lot for the info.

f150_wolf

Just so I'm clear, when you guys say "clean the connector" are you just meaning pull apart the electrical connector and make sure there is no gunk in there or pulling the actual oxygen sensor out of the exhaust line and soaking that in gasoline and scrubbing with wire brush?

There was gunk around the outside of the electrical connector that I cleaned off. I pulled apart the electrical connectors and it was pretty clean inside.

Thanks.