ObjectiveAway

Heated seat is basically just a long wire which heats up when attached to low voltage electricity. You just read what ever ohms you have and then check if that is not too much. The heated seats should have to 14V on full power. The plug connected or not connected dont change anything.

because it is poorly maintained for now, ask your local forums for a guy who remaps ECU's very well, take your Lupo to him and ask to check if every reading he can notice is good.

That will do the job 👍 I believe You saved this Lupo. If you want to clean your interior for very cheap you can go to self service car wash and spray the pre-washer (not foam, but pre-washer) in a bucket, then take a big sponge and rub the interor with the pre-washer (no need to soak everything, just wet the sponge and rub everything, some parts will get soaked anyway), then vacuum everything out. The pre-washer is perfect for cheap interior cleaning, but, just to be safe, try something little before you do it to all interior.

I don't really know, because I have never had 1.4 TDI, but google shows me Lupo 1.4 TDI fuel pumps from tank. @mk2 You have this engine, can you tell?

Isnt that buzz from fuel pump in tank? Seems like be your pump is goner, but you can test it very easy, when you cant start the car you need to give the pump a little tapping, for example tapp bottom of the fuel tank with stick or remove the cap under seat and lightly tap the top of fuel pump, that is often enough to make it work once again. The same works for starter motors, thats why bosch made a beautiful sticker: The problem is definitely not glow plugs, you can drive without them, especially no need for them at 35c.

I hope your headlights are fine now, it is a common advice for your Lupo 😉

Good job, keep going! Next I recommend to find someone who can remap your ECU and remove EGR valve, 1.4 TDI is good engine.

You can do it as @lupo 1.7sdi explained, but you can also remove the front grill (be very careful, it is from hard plastic and you need to put something between front wing and the end of grill to seperate it without breaking it), and then it is very easy to remove headlight, sometimes if the wires are badly oxidised it will be the best occasion, but if they are in good condition there is no need to remove the headlight at all.

They forgot to reset it.

hold in mileage reset button, turn ignition on (don't start car) and wait for display to show ------, realease mileage reset button. Thats it.

no need to remove battery, just open the heatlight cap and remove it

Bulb or the big connector on headlight?

Yes, switch is a whole unit, but when both front lights dont turn on, then it is most likely switch or fuse.

Most likely the switch

Try any LAMBORGHINI, PORSCHE, CUPRA, JETTA, VW dealer