So I took the car in for an MOT today as it was due, the emissions test came back with high CO, so chances are the lambda is reading right and there is an issue causing my light. Any ideas what could cause the high CO without impacting the driving? The lambda sensor is only 6 months or so old and I believe there is only the one before the cat which would mean its not just that its the cat gone, although speaking to the garage I may have to replace this.
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