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Del Hudson, from West London, said he did not think the 2000-plate Honda Fireblade would not be ULEZ compliant when the zone was expanded in August last year.
The woman, named Louise, was shocked when she received the fine last Tuesday, despite the fact she had sold her car 10 days earlier.
Millions of UK motorists could be at risk of being incorrectly penalised under existing rules.
A pensioner has been in a four-month dispute with the Transport of London after being hit with three separate emissions fines in one journey.
Drivers could be fined by not reacting to new car tax changes with London's Ultra Low Emissions Zone programme expanding to new areas.