High Pressure Sensor (G65) fault

The location of the High Pressure Sender (G65) on a SEAT Ibiza Mk4 is item #4 in the following diagram...




And a close-up here...

Forgot to add that the air conditioning system is not considered a critical component or safety system in the car and as such, if anything is wrong with it then it won't cause your car to fail the MOT. So you can leave it broken and your car will pass the MOT just fine (unless there is something else wrong with your car that is deemed to be an MOT failure).

Yes, that's the one.

On the side of the connector is a catch. You need to push on the connector as if you are trying to push it harder onto the sensor, then pull back on the catch back with your thumb, and while still holding the catch back, pull the connector off the sensor.




And this is a close-up of your connector from the picture you posted a link to...




You can see how a demonstration of it being done in the following video which shows a larger version of the same type of connector. The actual point of interest is 40 seconds into the video...



Just one important thing to point out. Whatever you do, don't just go unscrewing that sensor because it's plugged into a highly pressurised system. If you're considering changing that sensor then get an automotive aircon specialist out to degas and depressurise the system first. They will also dispose of the gas in a legal and environmentally friendly way. Then change the pressure switch, then get the system re-gassed.

The original VAG part number of the High Pressure Sensor (G65) for a SEAT Ibiza Mk4 is 1K0959126A, however this was superseded in June 2012 with revised part number 1K0959126D.

I was under the impression that on all VW Group cars, that switch is mounted into a selfsealing valve assembly, so if it gets removed will should just get a short "flash off" as a small amount of liquid/gas escapes, ie unscrew it quickly to minimise gas loss.

I'm willing to be shot down on this though, but if you look at the lump welded to that section of pipe, it should look like it is a bit more than an adaptor to screw a male threaded sensor/biswitch to a pipe.

Edit:- if you are concerned about getting your hand frosted, wear rubber glove!

You might well be right. I've never tried removing any aircon sensors on a VAG car. It would actually make sense for the design to be such that you don't have to de-gas and re-gas a system just to replace a sensor. I'm only going on past experience of other makes.

If someone can say for definite that there is a self-sealing valve in the pipe then it will be a safe enough DIY job, but if there are any doubts, better to play it safe and just call in a specialist.

Oh yes, but I should say that as I am lucky enough to have hold F Gas certification to work on any size of systems! Not got any use for that now that I'm retired, but maybe handy to have?

Edit:- great fore sight by VW Group if they have included a one way valve at that point as they do seem to have a lot of trouble with these valves across all their marques!

Looking at the exploded parts diagram below, there is an item shown (#37) which is not listed as a part you can buy separately. I appears that you only get that part with the complete pipe assembly (#7). It could well be that this item is the valve you are talking about.

Item #14 is the G65 High Pressure Sensor.

Yup, looks like it.