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Old 01-14-2009, 12:36 PM   #1
dlance
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Default How to fix "NO HO2S Switching" - code 41

The title says it all. How is this DTC addressed? New parts? Which ones? Truck does have an issue at idle.

1990 Ranger 2.9l V6

Thx,
Lance
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Old 01-14-2009, 01:15 PM   #2
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check for vacuum leaks, replace fuel filter, varify fuel pressure.
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Old 01-14-2009, 02:42 PM   #3
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Originally Posted by Wicked_Sludge View Post
check for vacuum leaks, replace fuel filter, varify fuel pressure.
+1

I had a gnarly leak at the very back of my upper plenum where it met with the intake. It ran rough at idle, "popped" out of the intake intermittently and threw that code. I reused the gasket and it eventually started leaking. Could very well be a vacuum line as well. Vacuum gauge will show leaks (or low vacuum readings), or spray as many connections as you can with carb cleaner. If the idle surges, there is a leak there. Misfire can also cause a 41, when was the last tune up?

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