4 months ago the yellow warning light came on. The local independent garage I've used for years checked the fault code, and replaced the catalytic converter. 30 miles later the warning light came on again. 2 further cats, and 2 lambda filters later, and the error persists. Honda have run a diagnostic, and been unable to help further. Now it has failed the MOT, on emissions. The car has done 110,000 and has been a great car to drive. I'd be sorry to have to scrap it. Any thoughts about possible cause?
Many thanks
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