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As Lukey says, not particularly important, although when its not working the ECU stops learning how the fuel mixture changes (LTFT) which means it has to work a bit harder to keep a perfect mixture based on immediate info from the lambda sensor (STFT). As long as there's no major problems with any other sensors and your engine's not too worn, it can cope OK.

Worth checking the plug into the little blue disc shaped thing and a quick look at the wiring.

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