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P0040 AUDI - Seat Leon 1.4s 16v

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The MIL illuminated, scanner reads P0040, DTC cleared but MIL came on again within next 15-20miles. No repairs to vehicles exhaust pre cat. Wires not twisted. Is it possible that the lambda post cat my be faulty? Can this be damaged by water?

Vehicle: 2003 (53 plate) 1.4s 16v seat Leon 1m

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