Originally Posted by 06fx4 L2
just replace every sensor.. thats the way your supposed to diagnose a problem
Don't do that...it's unecessary and costly.
You can try a few things...
Try replacing the fuel filter. That is cheap, easy, and you need to do it every 18-ish months / couple years. It's good for fuel economy, blah blah, etc... $$$ = $5 = NEED IT ANYWAY
Check your spark plugs. Make sure they are all gapped to .056" apart. Replace spark plugs if regapped and if plugs look good with no deposits or discoloration. $$$ = FREE
Thirdly, you got the "Bank 1 & 2 = Lean" code with a Check Engine Light...get a small bottle of propane, start your truck, and let the gas leak out of the bottle. Put the gas close to the intake manifold of your engine, right where your 1st & 2nd piston are (if you don't have a Haynes manual, borrow one, buy one (ur gonna use it later), or ask someone on here where it is. I believe it is the front right 2 on the truck (looking forward from the inside the cab). If you truck begins to IDLE SMOOTHER...you have a gasket leak. Not critical, but you will need to eventually need to replace the upper valve cover gasket.
$$$ = Cheap insurance to correctly diagnose the problem using about $6-7 dollars worth of propane. It is cheaper than paying $50 / O2 sensor...which x 3 = $150 + TAX. The valve cover gaskets costs $10 plus a couple dollars for RTV sealant...
TRUST ME...do not replace all O2 sensors for craps and giggles. Your stock sensors are good for at least 160,xxx - 200,xxx miles if not more.
Valve cover gaskets are a big time problem for rangers...
From 1995-2000 with the 60* OHV blocks, Ford used paper gaskets!