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1999 Suburban O2 sensor,which one??


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I have a 1999 GMC Suburban K1500 5.7L and get this trouble code:

P0141 O2 sensor heater circuit malfunction (bank 1-sensor 2)

 

Can somebody verify which sensor it would be? There are 4 of them. Don't want to replace all four as the truck has only 58K and the sensors are supposed to be good for 100k.

 

Thanks!!

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