Can anybody out there tell me how hard/expensive it is to replace the O2 sensor on a 2001 Supercrew/5.6L? As of late,my beast has been bucking intermittently but usually after she gets warm.Every other vehicle I have ever had in the past that had the same issues turned out to need a new sensor which was pretty easy to replace.But I have no clue as to how and where I would do this myself on my truck. If anyone can give me any other possible reasons for this behavior,your input is greatly appreciated.

 

Im assuming you have a 5.4L and not a 5.6L. I do believe everything location wise is the same as previous year models. I have a 98 model with a 5.4L. 3 of the 4 are pretty easy. The hardest one is the passenger side upper sensor. Its a pain in the ***. You'll need an open end 7/8 wrench to loosen it. The connector is a pain to disconnect as well. There really isnt much room there either. It cost me about $200 or so for all 4 sensors from Autozone. Its a DIY project. Just expect to spend half a day on it or so.

 

You can waste your money on a special socket or find a 22mm combination wrench. Unplug the sensor and slip the box end over the plug and un do them. Don't forget to use neverseize that comes with the new ones. It makes them easier to remove the next time. Just follow the exhasut pipe starting at the manifold and you can not miss them.

Regards

Jean Marc Chartier

 

Oh yeah...I realized it after I posted it.Should be 5.4 not 5.6---long Bacardi weekend.Anyway,I was going to try the fuel filter first before I got into more expensive prjects.I can get one for 17 bucks and its a quick frame job.Lets hope it solves the problem.I've done the whole new hi-test fuel and injector cleaner route and she still bucks going down the road.Check engine light still isnt on though....hmmmm

 

I'd try replacing the fuel filter, and plugs first. My truck was hesitating, or missing, when I'd run about 2500-3500 RPM. My buddy ran it for codes, but nothing showed up, neither did the "check engine" light. My first thought was the fuel filter, so I replaced it. That fixed about half of the problem. After the filter, I decided I'd try the plugs. Sure enough, after replacing the plugs, everything was straightened out, and now she runs great. I think I spent a total of $30-40, and about 2 hours. So, before you buy new sensors, I'd try the plugs, and fuel filter. Just don't forget to buy the little plastic tools to remove the fuel filter.

-Blake

 

Well i already checked the plugs and they were fine,gapped perfectly.And I decided the fuel filter is the way to go.The truck has only 46,000 miles so I would have been shocked if the plugs were bad anyway.I'm hoping the filter works out.

 

start with the two upstream O2 sensors.. they're $50 a peice at napa... if this solves the problem, then don't worry about the two downstream. it usually seems to be the upstream senors that cause the rough idle and stumbling.