Lets just check some other bits before jumping to conclusions.
Engines run rich on startup so as to combat fuel vaporisation and condensation issues. If it's still rich after a couple of minutes then check for Lambda sensor issues (Sensor 1) , this sensor should adjust the fuel back to Lambda 1. If it doesn't then it could be...
1) Sensor has failed/too old and tired to correct mixture properly
2) There's a combustion issue. An incomplete combustion could read lean (due to excess air in the exhaust gas) so the ECU adds fuel to fix this "lean" problem hence a rich smell.
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