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Mend Renault Co Laguna After Up

why is the co reading on my renault laguna high after warm up?

my renault laguna 2003 1800 petrol starts from cold and runs perfectly but as it starts to warm up the engine becomes noisey and the co reading rises to 9
i have changed the cat and the 2 lamba sensors but no difference

1969minor
November 2011
have you checked your air filter

SD
November 2011
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