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Hi All, My car's engine light suddenly went "on", and i checked that the error code is P0420 - Catalyst System Efficiency below Threshold. Went to a workshop and they told me cos I never speed my car long enough, carbon built up at the exhaust pipe area, nothing can be done with it. So they just cleared the engine light with their device, and that's all. Then after a few weeks, the engine light turned on again. May I know any of you has such experience before? According to the workshop i went to, they say such thing is very common in those eco cars. Not sure if it's true? Hope to hear some advices from gurus here. Thank you!
