Ran over piece of wood, hit underside of car, car died,wont start mk4 golf 2.0gti

The ECM doesn't have a relay! It works using low voltage and low amps.

The ECM does have a fuse assigned to it though.

Volkswagen Golf IV / Bora (mk4; 1997-2004) fuses and relays

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Volkswagen Golf IV / Bora (mk4; 1997-2004) fuses and relays. Advertisements ... 10, 10, Engine control module (ECM): gasoline engine.

hiya all can any1 help ive had a new master cylinder and slave because the car would not go into gear. problem not solved. took the clutch apart foubd out that the pressure plate is pused out with a long steel rod and it pushed out the nipple part in the middle of it. same happend with the new 1 it was only in there for 3 weeks what would cause that to happen again carnt figure it out any ideas guys vw golf t reg mk4 sdi 1.9

Get hold of a can of Plus Gas or even WD40

Open the slot where the key goes into with a thin screw driver push the thin tube on the can then into the hole

Cover with a piece of tissue , give it a god blast and leave it for a few hours

Do it again and this time gently rock the key as if you are trying to opem the boot

It should free off

As they say if you dont use it you lose it !

CHECK VACUM SYSTEM IF OK THEN THEN CHECK cpu AND ALSO FUEL PUMP SYSTEM

try your spare key. transponder in key could have gone bad

Part of the Speedo on a Golf has a connection to the engine immobiliser If a fuse has popped it was for a reason Is there a warning light on the dash display which looks like an engine with an arrow through it ?? You need a man with a laptop and software to check which codes have ben lost or corrupted

That might be just a coincidence but maybe it did contribute to the malfunction. Usually when it warns you with that message it would be the MAF (Mass Air Flow sensor). This is located outside the air filter housing and has a big plastic black tube connected to it and heads towards the engines throtle body, This is sold as a whole unit not just the electrical part. Air from the air filter passes through the heated sensing element and measures the volume of air coming in. As the air passes throught the heated element cools down and send voltage readings from it temperature and the ECU uses this data. It's always best to have your car hooked up to a scan tool VAG 1552 or equivalent reading any fault codes stored in memory before replacing any parts.

check your manual if you dont have it call vw make sure you have the vin number there or they might make you bring it there for a charge

yes