Breezy_Pete

When it stops working.

That sensor has a Schrader type valve under it, so replacing it does not result in any significant amount of refrigerant loss. Cost will vary quite a bit depending on whether a genuine VW group part is bought versus an aftermarket pattern part. There is no reason to replace anything else until the result of replacing just the pressure sensor is known.

Make sure the bonnet is fully shut, intermittent won't work otherwise.

Strange; I expected the same data tables.

I learnt two things this morning, one related to VCDS and the other about the fused feed I mentioned a few posts ago (engine bay fusebox fuse 11). I had always thought that VCDS only worked when ignition was switched on or engine was running. This morning I was looking at measuring blocks of the BCM and noticed that the displayed values kept refreshing even when ignition was off. That's good to know. The other thing was finding that the fuse 11 feed informs the 'voltage reference' as highlighted here: I was hoping that this would correlate with the 'battery'/charging system warning light, but unfortunately it's not that simple. Removing the fuse (with engine running) doesn't trigger the warning light. VCDS (with ignition off) show this when fuse is missing: The 'speech bubble' from VCDS is interesting. I would think that most of the time the engine is running, the voltage at that fuse would be higher than 13.5V (for non-start/stop cars anyhow). Perhaps the speech bubble says a different specification when engine is running? I didn't think to check that earlier.

The Roomster CBZB exhaust is single pipe from cat onward.

I don't have a downloaded facelift mk2 Fabia owner's manual, it should be towards the back of your hardcopy one, I think?

Apologies, I didn't scroll far enough and picked the CBZA data. Should have been this one; interestingly the same, exactly, for fuel efficiency.

Skoda offer these stats for Roomy with CBZB: I would say yesterday's journey would be nearer to the combination profile of journey, so they suggest 5.7L/100km. That's without A/C use for sure, and we all know that manufacturer's data is usually unachievable by at least some margin.

Oil separator and the PCV valve at cylinder head end are new and the internal inlet manifold valve was cleaned out when I found it after inlet manifold removal. That only leaves the valve that allows air entry from air filter, which is original, but works fine. Intake leaks maybe, but all seals on intake manifold were changed when that came off, and the two between turbo and throttle body are new. Vacuum line for brake servo etc. checked carefully. Not at all, as I've said before it is extremely smooth and near silent at operating temp when heard from driver's seat. Difficult to say, because I've never driven another car with this engine, in any condition. Thanks, me too. Which data?

It did 47mpg on yesterday's journey, 120 miles/3hrs home from alternator replacement location, with A/C working hard all the way.

As it was last time we discussed this, approx 45mpg, which is 6.3L/100km I think. I honestly don't think this is a problem for a Roomster with this engine on factory ECU software.

No, they were cleaned and tested by someone I trust.

I bought a secondhand set of injectors from a low mileage car about a year ago and had them cleaned and tested at a local specialist. Fitted them and noticed no change at all. 😆 Walnut cleaning would probably be more useful, but fitting a younger, less worn-out turbo is the next plan. Also probably new water pump and thermostat housing at same time. Scheduled for August. Between now and then I'm keen to install some voltage monitoring kit in the cabin, looking at both alternator output voltage and battery terminal voltage. No longer trust the car's resident warning system!

No, but that's way beyond being worth trying to save. I did refurb the car's original alt, but it's a right faff on the Valeo designs, and I wasn't very happy with the result. I did fit a new slipring assembly, which was pretty cheap, but I wouldn't bother again. Only paid £109 delivered for this aftermarket new one. The alt that the post-mortem pictures are of was sold on ebay as being from a car with only 50-odd thousand miles on it. In 6:6 (metric of 20:20) hindsight, I call BS!