How do i check a opel corsa 14i 1998 models fault light codes it doesnt have a 10 pin plug its got a 16 pin plug

We do not have Opel brand here.

the signal from the crank angle sensor thats mounted against the block pointing to the crank pulley is what tells the ecu that the engine is turning and to provide spark and injector pulse
so your possible problem area is the ecu
also check the ecu harness plug wires and pins
make sure the crank angle sensor is plugged in

Do you have plug wires if so did you change. Could also be the signal coming from the computer

either the crank sensor or the coil packs are the usual causes , if post 1996 get the obd codes read as will tell which one earlier models have obd I and is not as reliable , google obdI for your model if pre 1996 for list and procedure

Front right lower side is the crank sensor ,in line with the crankshaft ,could be this playing up although i have had many problems with this type of engine ,one problem is the computer bolted to the engine ,seem to suffer heat fatigue ,another problem i cannot explain is it just will not start and for this i fit a crank sensor from the earlier version with the toothed front pulley and support then cut the wires from the crank sensor and run them to the one at the front of the engine but they are polarised on the wires so if it doesnt start reverse the wires to the crank sensor ,Now no doubt iam wrong as ever but i do think that the crank becomes magnatised and its affecting the sensor so by moving it to the front pulley it eliminates this problem .

crank position sensor or cam sensor

have the fuel checked for water or a blockage , injecters also mite need cleaning !

What spark plug wire? A 2008 Corsa has a sealed coil pack connected to all four plugs and bolted to the cylinder head

run fault codes and check for crank/ cam position sensor fault as if they are faulty there will be no spark until the cpu knows where the piston position is.

No idea offhand to be honest i would need my head under the bonnet to know what wrong .could be anything from the gauze filter in the fuel tank on the bottom of the fuel pump becoming chocked up and leaving the car allows it to drop away to a faulty pump overheating or the contacts ,maybe even a ignition module overheating ,Best advice is ask a local mechanic to have a look for you as normally these early opel corsas with the 4 cylinder engine are bullet proof they are even valve free if the timing belt snaps .