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A3 Water Dripping from Exhaust Backbox

Featured Replies

Hi all,

I've been noticing a really odd water drip when we reverse the A3 onto the drive, its just leaves a small trail. It did it again at the weekend and I go underneath an noticed water leaking from the exhaust, but there was nothing leaking above it and the exhaust isnt rusty or blowing, so no wear/tear holes.

I did a quick google search and it transpires this is quite common, however is this normal? I've never seen this before so I am "baffled", pardon the exhaust pun.

Have you guys also got this? Is it normal? Should I be concerned or remediate some way?

Thanks.

It's only condensation and nothing to worry about. Water vapour is formed during combustion which then condenses in contact with cold steel. It will be worse in cold weather and will disappear when the exhaust system is hot.

  • Author
On 5/26/2025 at 11:05 AM, cliffcoggin said:

Was the reply of any help Gerry?

Absolutely yes, I have learned to ignore it as it does just look like water. Car does short journeys mainly so as you say, hopefully just vapour and nothing to worry about. Thank you.

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