Silicon looks a possible culprit?
You should never use a silicon based sealant or liquid gasket upstream of any sensor, let alone have it as an additive in the petrol!
Now there's a few quid Tesco's are going to loose over the next few weeks!
Will they empty and flush out all infected garage storage tanks? Mmmm! Maybe give them a miss for the next six months? (personally,I don't normally use them anyway)
JohnD

 

I've heard that the silicone is added as an anti-foaming agent, maybe they put too much in!!

 

Let's hope they take responsability for this, we all know what supermarkets are like. They think they're bigger than the world.

Is it only certtain fuels that are affected or is all of them. I use RON 99 from Tesco's and fingers crossed, I've had no problems

 

Why can the Sensors not be cleaned???

 

it damages them pete, not just coat them.

and luckily for tesco's it wont be them footing the bill, will be the fuel depot, or where the fuel was made/mixed. costs will go back up the chain as it were

 

Doubt Tesco and Morrisons will care about any costs incured, they will probably pass them onto there supplier Greenergy.