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  1. K

    17440: NOx sensor or filter

    Hi there, New to this forum but I have been lurking for a while, so please forgive me if the following has been answered before. I have an Audi A3 (8P1) 2.0 FSI (BLX). It recently sailed by MOT, however shortly after this I took it on a road trip and the engine went into limp home mode...