As far as I know they can not be cleaned. Must be replaced.
That Vehicle has 2 oxygen sensors.
My 1995 Ford Explorer with 4.0 L OHV has 2 oxygen sensors (Helpfull)
No, they will need replaced if defective.
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Have you had your 4 oxygen sensors replaced? It turns out when they replaced my oxygen sensors, they were after market parts so the service engine light did not come and gave codes even though they were replaced.
Only ones that have failed.
NO. there 2 different things / sensors.
If the oxygen sensors for the 1991 Chevy 4.3 is running rich when it is warmed up it is best to have the sensors replaced. Once the sensors are replaced this should resolve the issue.
I'm not a mechanic / technician but on a 1988 Ford Ranger there might be ( 1 ) oxygen sensor ( upstream sensor )
And they are expensive to replace... (i replaced one @ $400)
According to the engine wiring schematic in my Chilton book : For a 1999 Ford Ranger , 4.0 liter EFI , V6 engine : ( there are 3 oxygen sensors )
There are 2 heated exhaust gas oxygen sensors , 1 screwed into the outlet on each exhaust manifold on a 1993 Ford Ranger 4.0 L .