1997 Ranger 4.0 Oxygen Sensor Code Help!

[dobekurt]

I am fixing up a 1997 Ford Ranger, 4.0, automatic, for my daughter.

I have the following engine codes:
P0135 O2 Sensor Heater, Bank 1 Sensor 1
P0141 O2 Sensor Heater, Bank 1 Sensor 2
P0155 O2 Sensor Heater, Bank 2 Sensor 1

The sensors have been replaced in the past year. I took it to a shop where they suggested replacing the ECM, picked one up at the junk yard, same issue.

The truck runs good, I need to get it through emissions.

Any suggestions where to start?

Thanks all for your comments!

Dan

 

[Sasquatch_Ryda]

First thing to check is Fuse 20 in the under hood fuse box. It is a 15 amp fuse for the heated oxygen sensors.

 

[dobekurt]

Thanks for the help! Of the few mechanics i know who think they know alot about cars, no one mentioned the fuse. One of them even hooked it up to his scanner. My daughter is stopping by tomorrow morning, I will let you know what happens.

I had checked out the harnesses, followed them back behind the engine to the big harness, everything looks good.

 

[dobekurt]

My daughter came over Sunday to watch the Bears loose. The HEGO fuse was blown!
I changed it, I didnt have a chance to clear the codes, will do it this weekend and see what happens! Now I have to work on a transmission code!