My car has just failed the MOT. The emmissions are high. The Lambda is ok but the CO has difficulty getting to the required reading. The lambda is only a couple of years old. Is there any way of finding out and checking which parts are playing up ? Thanks
High CO with everything else ok is normal for an aged cat. Don't waste money on potions. Aged cats struggle to operate at low exhaust gas temperatures. A good run immediately prior to emissions testing can usually do the trick.
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