For a 2001 Fiat Uno diesel, the most compatible engine options include the 1.7-liter Fiat diesel engine, commonly found in various Fiat models of that era. Additionally, some enthusiasts have successfully swapped in the 1.9-liter diesel engine from the Fiat Punto for improved performance. Always ensure that any engine swap adheres to local regulations and compatibility with the vehicle's transmission and electronics.
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