Hey back here again!
I had some good help last time and really enjoy this site and the people here!
I have a a question about a few codes and what to diagnose. Code 172 HEGO (HO2S) Sensor Fault/Lean. I have a 1992 Ford F-150 5.0 (302) 4x4 with two tanks. Does this truck only have one O2 Sensor? Or more? Also I'm getting a Code 411 Cannot Control RPM During KOER Test, Low RPM Check. Also it has a exhaust manifold leak on both sides there's a crack. I did put JB Weld on them so sounds a little quieter but still kinda loud.

 

I would look into your throttle position sensor to being faulty, and also to check to see if the ECU is damaged, also yes only one 02 sensor.
When was the last time the O2 sensor was replaced?

 

So change out the throttle position sensor? Is that for the 411 code? I'll check the ECU as well. What would I be checking for and how? To be honest I just bought the truck for $750 and it has 140,xxx miles on it and the transmission was rebuilt a year ago from wat I was told. It has new water pump and new oil & filter so far and air filter and a overdrive button because it didn't work. About to do a tune up soon. So I'll have to just change out the O2 Sensor then. Would it be smart to do it after the exhaust manifolds are replaced or is it ok to do it now? Thank you for you answer Puddy! I appreciate it!

 

Actually check and see if you still have your spout plug connected, it's right next to the ICM on the driver fender.( little grey plug, 2 wire)

 

Yeah it's still connected on there I pulled it off and cleaned it.

 

Leaky manifolds is causing the lean codes for the O2 sensor, need to fix that ASAP before you start throwing anything else at it. JB weld is only a band-aid.

 

Oh ok yeah, only thing is there 160 for the two manifolds at autozone. Just gotta save up the money. So what about the the low rpm fault on KOER test?

 

Manifolds firs then see where you are at, sometimes these issues can work hand and hand with each other. That's just my two cents.

 

Ok I'll do that first then. Thank you for your help and two cents! I do wanna get them changed out. Any ideas on a good brand or which kind that are the best for the 5.0 motor?

 

No real brand specificness just whatever you can find the cheapest at your favorite local auto parts store.