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Pulled Codes - got a question!

3K views 5 replies 2 participants last post by  LunaticSVT 
#1 ·
My reader reported a "172" code, which the readers book says its a "Heated Oxygen Sensor, BANK 1, Lean"..

WHICH SIDE IS BANK 1???????

1991 Ford F-250, 5.8L EFI engine.

Thanks for any help.

Jim
 
#4 ·
normally i would replace both at the same time. it is a little more money to do it, but it is well worth it. I have seen the second bank throw codes right after replacing the one causing the problems.

just my thoughts. i know that others have only replaced one and not had a prob. how many miles you have on the engine will also be a factor in this decision. also pull a plug and check for fouling. It may be something a little more than an o2 sensor.
 
#5 ·
The engine has 78,500 miles on it (orginal miles,not rolled over).

I looked it up in my Haynes manual and it also says replacement is way overdue....

The engine runs smooth, but the idle's faster than normal until the check engine light comes on, then it drops down to normal.
Cold engine starts without a CEL...

Jim
 
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