Warrior193

Why not try putting it on charge with the hood closed? There is often a gap sufficient to pass a charger mains supply cable to outside the vehicle. This is what I do with the Octavia and Fabia.

Thanks, SHMBOs Fabia is CHZC so possibly not affected - but I will keep an eye on it for this issue.

@DR79 Are you sure your Fabia is a Mk IV and not a facelift Mk 3? Your title section has the year as 2020.

Do the new tyre sizes moulded into the sidewalls exactly match the fronts? Do you know if your TPMS is direct or indirect type? - To explain, the indirect type operates by calculating the tyre rotational speed through the ABS system, while the direct system reads actual tyre pressures via wireless sensors fitted to the wheels.

While not ideal, the lower capacity battery maintainer (charger?) will still keep the battery in better condition than without - it would only affect the length of time it takes to attain a full charge - and possibly any test function your Optimate maintainer has. Re. why your using a smart charger was setting off your wife's Kia - could it have been because the alarm was sensing the hood was open while charging?

@Mattn00b are you able to post your engine code? you can find it on your V5 document (four letters in front of engine number)

The only really reliable way to test the condition of the battery is - 1 - Give it a full charge with suitable charger, ideally, a 'smart' charger. 2 - After full charge achieved, remove surface charge by allowing battery to stand for around 12 hours - or by using a load such as headlights, etc, for a short period. If the test is done while battery is connected in vehicle, you need to ensure that all control modules have been allowed sufficient time to enter sleep mode. 3 - Test battery condition with specialist battery condition tester (not expensive) - or an 'old school' high-rate discharge tester.

Assuming (from your model year) that you do not have the SOC function in your Maxi dot display, a reasonable indication of falling battery state is the stop/start frequently not shutting the engine down when stopped in neutral - IIRC, message displayed in 'vehicle status' will be 'load too high' or something similar.

From my understanding, the only critical information for the adaptation is the battery type (fleece or EFB) and capacity - the serial number can be simply changed by one digit to indicate the battery has been changed.

That is very likely correct operation of the smart alternator - the only real way to check alternator output on these micro-hybrids is live data on a run - in particular, checking the output while in energy recuperation mode. Another way could be to temporarily disconnect the battery monitoring module on the battery negative clamp.

Be aware that some Halfrauds branches are apparently unable - or unaware of the necessity to do a battery adaptation when fitting a new battery.

Just a note, I only changed the glove compartment to led around 6 months after I fitted the trunk lamps - so that reference may be coincidental. I did encounter a lot more difficulty in getting the glove compartment led to physically fit correctly - mostly due to having to work by feel.

@thisischeese I got my ones for the Octavia from a supplier on the Bay - Take a look at Supersuperstore (195773) These worked with no issues - trunk and glovebox.

Assuming poster meant as a test - Slow down to as low a speed as possible in gear, then drop the hammer and look for increased revs without matching increase in speed - works better uphill.

Either type will do, EFB is cheaper, AGM is supposed to be superior and last longer - but is considerably more expensive. Be aware that you will need to adapt a new battery into the BCM, particularly if you change from one type to the other. Do you know if this was done correctly when the battery was replaced under warranty? That AGM really should have lasted longer than that.

No, the resisters are usually mounted in the light section itself - I had the same adaptors supplied with my LEDs - which worked without problems (without the adaptors) in the both Octavia and Fabia. The adaptors are for fitting to vehicles with different cabling. The only issue I had was having to trim the aperture a little so that they fitted correctly. @thisischeese I will look up the details of the supplier I got mine from.

Possibly worn syncro hub in gearbox - do the gears also make a 'clashing' noise when you get this whine? Do you know how to double-declutch when changing up a gear?

Unfortunately, even to unlock the drivers door via the (concealed) emergency lock cylinder will require the spare key.

I have seen recent postings from another TDI owner with identical issue - resolved by replacing the faulty battery. Have you had the battery tested?

Hello MILF, welcome to the forum. Strongly recommend a proper battery test. The control modules on these vehicles appear to be very sensitive to low voltages from a failing battery. What is your fuel type and engine code?

Was the old battery the same type and capacity as the one currently fitted? There is an adaptation required in the BCM, ideally every time a battery is replaced - especially if the replacement is different from the original. Critically, is the present battery a EFB or AGM?

@9737u50 - varying alternator voltages are normal with the micro-hybrid energy system, with battery charging intended to be primarily from energy recuperation during coasting and braking. The battery will typically be charged to around 75-80% by the alternator using engine power - leaving capacity for energy recuperation.

Hello, welcome to the forum. If your battery tests as OK - and your alternator voltages look good, I'd suggest that there is something not 'going to sleep' correctly after you shut down. Check the forum for parasitic drain on battery. The noisy fuel pump should not be the cause (unless it keeps running after engine shut down) Were there any changes made to the vehicle around the time this problem started?

Alcohol has an affinity to water. Dosing fuel with alcohol makes any excess moisture it contains miscible and is then burnt.

Hello @red2 To edit a post, click on the 3 dot symbol at the top RH side of your post - you get an option to report, edit or share the post.