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decat eml light and 02 spacer

Discussion in 'Leon Mk1 (2000-2006)' started by W11TTX, Dec 28, 2012.

  1. lamby

    lamby Active Member

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    I would have thought that all the mixture reading would be taken from the pre cat as that one will get a more pure reading of whats happening in the engine, whilst the second checks the post cat reading to check the cat. please correct me if thats wrong
     

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