So I do a lot of motorway miles, done 28k miles in my Fabia VRS 2013 so it’s fairly low mileage and in immaculate condition so I thought.

 

On Friday night I was driving at about 75-80 when I suddenly get intense shuddering from the engine, a engine management light & EPC light. I lose all power and the engine is going crazy. 
 

I pull over and call the AA out the car starts and begins to drive as normal but there are multiple codes on it; O2 sensors failing & combustion failures on cylinders 2,3,4. 
 

I took it to a mechanic who reset the computer and drove it round town to which it drives fine. Yesterday I took it back on the motorway and I get the same management light and EPC light. Again call the AA out and they change the engine coil packs (twice and tested by both me and the mechanic) on cylinder 2 which is where the fault was localised to according to the computer.

 

None of this has fixed the problem, wondering if anyone has any ideas on what it could be?

 

It tends to start going haywire when I put my foot down to get a quick start (not even flooring it ridiculously) or when the engine is under a high load for a prolonged period 70+ish for around 5-6 miles.

13 minutes ago, RushiVRS said:

O2 sensors failing

 

Have these been replaced?

No, the O2 sensors haven’t been replaced but are not showing a reoccurring fault through testing. The only reoccurring fault is the combustion failure on cylinder 2.

 

I think that the first time it happened was the worst as I was in the 3rd lab and had to pretty much coast with no power while shuddering and safely move the shoulder which took ~30 seconds which is why I think 3&4 started misfiring the first time too.

Since the AA person removed the coils did they bother to take out the spark plugs and check.  All 4 not just 3.  Same with the mechanic.      Your waterpump / magnetic supercharger clutch might soon be due a replacement if not already done. 

Edited 9 February, 20224 yr by roottoot

Spark plugs were removed and checked on 2,3,4. All visually looked good with no issues.

Agreed; this sounds like a coil or spark plug breakdown under load, and you've already replaced at least one coil pack.

So best check what you are calling cylinder 1.  Was removing the pipework too much trouble. 

1 minute ago, RushiVRS said:

Spark plugs were removed and checked on 2,3,4. All visually looked good with no issues.

Still sounds a lot like plug insulation breakdown (probably on #2) to me.

When was the last time the plugs where changed and what brand as you wont believe how picky these cars are for plugs, Unfortunately the AA man will just see this as a generic VAG tsi and would most likely not have a clue about the required spec of the coils or plugs.

Edited 9 February, 20224 yr by Mickmartin

My local garage missed a problem on cylinder 3,  which is prone to issues with plugs / coils, Got something similar going on myself at the minute! 

1 hour ago, Kobayashi said:

My local garage missed a problem on cylinder 3,  which is prone to issues with plugs / coils, Got something similar going on myself at the minute! 

 

If new plugs and coils don't solve it, check the wiring to the coils.

Edited 9 February, 20224 yr by Mickmartin