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The engine fault light is on but the engine is running fine and miles per gallon are very good No problem with the running of the car just at A strong smell of exhaust gas Otherwise the car engine runs fine

Vehicle: 2002 Vauxhall Corsa 1.0L

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Hi there,

The code P0420 is for catalyst below efficiency. Based on your rich fuel smelling exhaust I would say you either need to replace the catalytic converter because it's not cleaning the exhaust properly or tune up the engine so it's burning the fuel better.

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