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International Automotive Technicians Network
Re: Reoccurring PO420
Posted to Technical Discussion Forum on 1/6/2011

I'm with you Michael. I have installed lots of O2 sensors from Napa without any problems. Most have been Bosch, but I always try to get what ever was the OE maker, such as some vehicles use NTK O2 sensors as OE, so you just have to choose the right sensor.

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