Code P0135 Dodge 1500 Ram?

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Helping friend with a Dodge Ram 1500 1998 5.2L.

We replaced the rear 02 sensor because a wire burnt and went to ground. We cleared codes, truck ran fine for 2 days CEL came on again, with code p0135.

Book says 02 Sensor heater circuit malfunction cyl bank #1 Sensor #1.

Is this the 02 Sensor closest to the engine? We already changed the 02 Sensor furthest from the engine.

Exhaust smells like the engine is running rich.

TIA
 
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