My ford fiesta 2005 wont start. This started after washing the engine with a hose a few weeks back.

The serpentine belt has no bearing on the camshaft timing, so my guess is that you mistimed the camshaft timing for no reason.

The serpentine belt is external and is driven by the crankshaft and runs the alternator, the A/C, Steering Pump and water pump.

If your CAMSHAFT belt broke, the Ford Fiesta has an interference engine, so you have bent valves and damaged pistons.

Does A Ford Fiesta Have A Timing Belt Or Timing Chain?

https://www.autopadre.com > belt-or-chain > ford-fiesta

Ford Fiesta - Timing Belt Or Chain - All 2011 Ford Fiesta engines have a timing belt and are interference. Engine Type, Timing Belt Or Chain ..

Is alternator charging properly? Does the battery go flat?

Try charging the battery!

Leave the radio switched on for 1 hour it should reset. If you start car, switch off radio or switch off ignition you must start your hour again

check to make sure you connected all the wires back together properly and check your grounds to engine harness

Im thinking your starter switch.

On most cars today if you step on the pedal you change the t.p.s..throttle position switch.and cause the computer to get a wrong reading.

Please remove the Ford Fiesta logo from the car and it should run better. If not then try replacing the fuel filter.

tap on tank while someone is turning engine if it starts its the fuel pump if it doesnt check spark them find fuel psi relief and check for gas

this is a shift actuator fault