Hi all, just wondering if someone could help please?

Despite being changed last September and only after 8k miles, spark plugs 2 and 3 are really corroded, and I'm now getting a misfire on 3 and engine warning light. Spark plug 2 was literally stuck in last September, had to take to Skoda to change.

It seems as if I must have a leak somewhere, but I can't think how moisture or anything else could be possibly getting in to corrode in that short a time frame. Does anyone have any ideas or experience of this please?

Thanks in advance!

Octavia, 2019, 1.0tsi, 80k miles

Welcome to the forum.

Before the plug change at 72,000 were the plugs changed at 40,000?

I had to look at your profile because you do not say where the car is parked, or how long you have had it.

Was it valeted sometime maybe engine / engine compartment steam cleaned.

De-greased, detergent. (Sodium / salt) = corrosion quite commonly.

Is it parked at the seaside or maybe before you got it.

Edited 12 June, 202512 Jun by Ootohere

28 minutes ago, Ootohere said:

Welcome to the forum.

Before the plug change at 72,000 were the plugs changed at 40,000?

I had to look at your profile because you do not say where the car is parked, or how long you have had it.

Was it valeted sometime maybe engine / engine compartment steam cleaned.

De-greased, detergent. (Sodium / salt) = corrosion quite commonly.

Is it parked at the seaside or maybe before you got it.

Thanks for your reply Ootohere! We've had the car 2.5 years, but neither us nor Skoda have anything that says the plugs were done before this point (interestingly I got Skoda to pay for the removal of the stuck plug at 72k as another garage had assumed it was stuck because they hadn't been changed in the lifetime of the car, and it was an approved used).

We're about 5 miles from the seaside so don't think it's that, haven't had problems with previous/other cars. Not been valeted or engine cleaned etc.

9 hours ago, JonathanG said:

I can't think how moisture or anything else could be possibly getting in to corrode in that short a time frame.

If you burn 1 gallon of hydrocarbons in air you get 1.1 gallons (liquid volume) of water.

7 minutes ago, Paws4Thot said:

If you burn 1 gallon of hydrocarbons in air you get 1.1 gallons (liquid volume) of water.

Very true. But it's that bad, my normal garage won't even attempt to remove 2 of the plugs as they dont want to risk it, which is certainly not normal with 8 month old plugs, so there must be something else at play? It doesn't seem to be a common problem...

I can understand them not wanting to take any blame, or expense.

You should have those that put them in have to take them out.

Personally i would do what is needed to do to remove them.

Penetrating oil, the good stuff, not just any old water dispersant would have been down there for a day or so.

Then i would be driving the car and getting the engine and plugs hot, and with care and a good plug socket be removing the plugs.

40 minutes ago, Ootohere said:

I can understand them not wanting to take any blame, or expense.

You should have those that put them in have to take them out.

Personally i would do what is needed to do to remove them.

Penetrating oil, the good stuff, not just any old water dispersant would have been down there for a day or so.

Then i would be driving the car and getting the engine and plugs hot, and with care and a good plug socket be removing the plugs.

I'm booked into Skoda on tues for them to take a look as they put one of the plugs in. What I need to find out though is why it's happening so quickly- I can't be having this problem every 8 months/yearly!

My best guess, the engine was cleaned / degreased,

or there was a flood pre you getting the car and the Dealership sold an Approved Used car and without know if serviced to Schedule, recommendations, guidelines or advice of the Manufacturer put it out without them servicing. Changing plugs,

The Rust / Corrosion was there then, was there when the plugs were changed and is not somehow disappearing as if by magic.

?How many registered keepers before you, and how long did the last keeper have the car?

Edited 13 June, 202513 Jun by Ootohere

9 minutes ago, Ootohere said:

My best guess, the engine was cleaned / degreased,

or there was a flood pre you getting the car and the Dealership sold an Approved Used car and without know if serviced to Schedule, recommendations, guidelines or advice of the Manufacturer put it out without them servicing. Changing plugs,

The Rust / Corrosion was there then, was there when the plugs were changed and is not somehow disappearing as if by magic.

?How many registered keepers before you, and how long did the last keeper have the car?

That makes sense. I understand it was a hire car (Hertz or someone of that ilk) before we had it, so one owner, a lot of drivers, but there's no real service history. There are a fair few things that were replaced during its first ownership, including a rear bumper and all wheels!!

Engine code needs checked. Not that that means anything as Skoda / VW replaces ones under warranty and told keepers DVLA did not need informed as like for like and they had the same numbers. They lied.

Hmm that sounds dodgy, ill double check later! I only know what's been replaced as a friend had access to the Skoda system - Skoda weren't officially telling me anything!

Any engine could be put in as a replacement at any time, even from a salvage yard where cleaned up, wrapped up and delivered.

'Water in the hole Captain'.

http://briskoda.net/forums/topic/324108-replacement-engine-engine-numbers-v5-dvla-skoda-uk-what-happened

Edited 13 June, 202513 Jun by Ootohere