Engine not running

P0303 - Cyinder 3 misfire detected.
P1300 - Unable to find any information our database but should be related to P0300
P1225 - Cylinder 1 injector circuit shorted to ground
P1226 - Cylinder 2 injector circuit shorted to ground
P1227 - Cylinder 3 injector circuit shorted to ground
P1228 - Cylinder 4 injector circuit shorted to ground
P1425 - Tank Vent Valve shorted to ground
P1472 - EVAP emission control LDP circuit short to ground
P1582 - Idle Adaptation at limit.
P0102 - Mass or Volume Air Flow Circuit Low Input.

Since vehicle is not starting, I would suggest starting with the injector circuit first.

FUEL INJECTORS, CHECKING
Checking activation

Check activation of fuel injectors.

Special tools, testers and auxiliary items

a) VAG 1598/18 test box
b) Multimeter (Fluke 83 or equivalent)
c) VAG 1527B voltage tester
d) Connector test kit VW 1594
e) Wiring diagram

Check conditions

a) Engine speed sensor OK
b) Fuel pump relay OK

Test sequence

Remove intake manifold, upper, see Fig. 2, item 7.
Disconnect harness connector -1- from connection -2- and connect VAG 1527B voltage tester with test leads from VW 1594 to the terminals of the harness connector.

Disconnect harness connectors from fuel injectors 2-4.

Operate starter and check the voltage supply for no. 1 cyl. Fuel injector.

LED must flicker

Repeat check on fuel injectors 2-4.

If the LED does not flicker:

Turn off ignition.

Connect VAG 1598/18 test box to ECM wiring harness.
Fig. 118: Connecting VAG 1598/18 Test Box To ECM Wiring Harness

Check wiring between test box and connector for open circuit according to wiring diagram.

No. 1 cyl. Fuel injector: terminal 2 and test box socket 24

No. 2 cyl. Fuel injector: terminal 2 and test box socket 25

No. 3 cyl. Fuel injector: terminal 2 and test box socket 26

No. 4 cyl. Fuel injector: terminal 2 and test box socket 02

Resistance: maximum1.5 ohms (ohm)
Fig. 119: Checking Wiring Between Test Box And Fuel Injector Connector

Check wiring between fuel injector connector terminal 1 and relay panel for open circuit according to wiring diagram.

Resistance: maximum 1.5 ohms (ohm)

Additionally, check wires for short circuit to one another.

Specification: "infinity" ohms (ohm)

Checking resistance of fuel injectors

Check resistance of fuel injectors individually
Fig. 120: Checking Resistance Of Fuel Injectors

Specification: 15-20 ohms (ohm)

If the specification is not attained, replace fuel injector(s) as necessary.

Check out the diagrams (Below). Please let us know what you find.

If it is an ignition switch problem, you would not be getting any sparks as well.

At the injector circuit, ensure there is battery voltage at the RED/Violet wire with ignition switch turned on and while cranking. If voltage is available, the fuel pump relay is working correctly.

The cruise control is linked to the ECM. Check fuse # 5 in fuse panel behind left sie of dash. Use a DVOM to check the Black. Blue wire for battery voltage with inition switch turned on. If voltage is available, ensure White/Yellow wire from switch has battery voltage. If voltae is available, you could have a faulty ECM.

Check all fuses under hood and in vehicle. If the wires touched, they shorted. The first thing should have been a fuse. Remove the fuse that is in the affected circuit and check it for continuity. It could look good but still need replaced.

Check out this guide

https://www.2carpros.com/articles/car-cranks-but-wont-start

The next time it does not start, leave the key in the ON position. Is the CHECK ENGINE light on?

The check engine light should be ON when the key is ON. If not, then the Engine Computer is NOT powered up.

Could be a bad ECM relay.

Thomas

That could very well be the case, try to undo the negative cable on the car battery for fifteen minutes and then put it back on and then try.

Ignition key will have to be re programmed so the key reader and PCM can read the chip in the key.

I would look at the connection on the starter motor. The little wire may not be making good contact.

Roy

When you turn the key to the on position without cranking the engine over can you hear the fuel pump run in the tank for 5 seconds?

https://www.2carpros.com/articles/car-cranks-but-wont-start

Please run down this guide and report back.

If its cranking over and will not start-Do below

Cranks and w/n start

Get a helper disconnect a sparkplug wire or 2 and ground it to the engine -have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs, coil's resistances, distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it

No crank at all/nothing/nada:

Could be the starter, starter relay, park and neutral switch and ignition switch assuming the battery and connections are good.