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Disconnect compressor clutch from control circuit and give 12V. Note whether clutch engages.

Good result. Any other issues crop up, keep us posted. Sent from my iPhone using Tapatalk Pro

Your oil pressure may very well be perfect. The pressure switch or its circuit may be defective however, giving an erroneous warning. Sent from my iPhone using Tapatalk Pro

Oil pressure switch or switch circuit? Might want to get a pressure gauge on that.

This.

Glad you're sorted. You're welcome. Thanks for the update.

Check volt-drop as per diagram (ignition switch -> starter; should of course be ~0V) -> trace/repair volt-drop as required. Let me know how you get on.

PM reg and I'll help.

Wow!

It's not airbag. Airbag is yellow. And yes it definitely would log a fault. You removed the glovebox because of error: 00604 - Potentiometer Positioning Motor for Air Flow Flap (G113) 30-10 - Open or Short to Plus - Intermittent?? So does this code clear?

What makes you think plug is faulty?

This means that either your terminal 50 circuit or signal is faulty. If it's wiring, you'll need to run a new wire/wire section as appropriate. If it's the signal you'll need a new switch. Both are easily checked by someone who knows what they're doing.

Right. The one on the left is a solenoid by the looks of things.

No you would need a something like a powerprobe capable of inserting a ref voltage, as a dummy sensor, within the plausibility range of the original sensor. You don't want to fire 12v up the wrong line. When you see the smoke, you won't be able to get it back in :P If you want to send me your...

If main relay is defective you'd get a non-start on account of no power at ECM. If I've correctly interpreted you original post, this isn't the case?

Can you check measuring blocks via VCDS?

If still wanting to test ECT: Can you send a ref voltage up the relevant temp sensor circuit and read out block with VCDS. This will confirm is sensor/wiring is defective.

I agree completely, but 'twould be folly to assume ;)

Have you check the block for ECT via engine module? If it's still 30 when vehicle warmed up, your going to need to confirm wiring between sensor and ECM. Is your new ECT sensor OEM?

Check it with key on from cold for plausibility. If plausible, you should then you check it through warm up (while agitating loom).