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tengo un codigo en mi audi 2002 a4. es el po140, cual de los dos sensores devo remplazar, el de antes del catalizador o despues del catalizador?

Vehicle: 2002 audi a4 1.8t

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El que esta despues de convertidor catalitico.

P0140 AUDI - HO2S12 Sensor Circuit No Activity Detected

Read more: https://www.autocodes.com/p0140_audi.html

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