Tyre losing pressure

strawb_shortcake

Probably a stupid question, but never had this on a previous car.

About 2 weeks ago my car flashed up a warning to say the tyre pressure was low, checked the tyre (well OH did) and all were fine bar one. 
Yesterday afternoon whilst driving same warning, came home and same tyre as last had reduced to around 20psi? 

Planning to take it to the garage tomorrow, but my usual garage doesn't do tyre fitting so have no relationship with a tyre fitter. I'd assumed just a new tyre, but now looking into seems this may not fix it, how do I make sure I get the right fix first time? I can't see any damage to tyre or rim but obviously don't have full visibility of entire tyre. 

Tyres are maybe a year old and done less than 10k miles.

TY

Wormcake_101

Hi There, I had a similar issue, and it turned out that the tyre rims had corroded rather than the actual tyres.  It may worth checking that before taking any other action. 

strawb_shortcake

Wormcake_101 said:

Hi There, I had a similar issue, and it turned out that the tyre rims had corroded rather than the actual tyres.  It may worth checking that before taking any other action. 

Thank you, there is no visible damage that I can see, but will have another look 

facade

Just take it to a decent tyre fitter and tell them it gradually loses pressure and you want it repaired.

If there isn't an obvious nail in the tyre, they will put it in a pool of water and find the leak, then fix it.

Probably around £20 including re-balancing.

(There are some magic tyres that cannot be patched, and sometimes the nail/screw has gone through a place where they cannot patch it, but if it is a nail through the middle of the tread, or a leaky rim they will fix it)

strawb_shortcake

facade said:

Just take it to a decent tyre fitter and tell them it gradually loses pressure and you want it repaired.

If there isn't an obvious nail in the tyre, they will put it in a pool of water and find the leak, then fix it.

Probably around £20 including re-balancing.

(There are some magic tyres that cannot be patched, and sometimes the nail/screw has gone through a place where they cannot patch it, but if it is a nail through the middle of the tread, or a leaky rim they will fix it)

Thank you, we have quite a few local independent ones so shall try one of those

Stubod

..had exactly the same problem on an old Toyota Rav 4 with alloy wheels. Every year one of the tyres would  start to loose pressure due to corrosion around the rim. £20 at the local tyre shop to take the tyre off, repair and replace..

baser999

Perhaps it’s the actual pressure fitting on the wheel itself that’s the problem? Tried switching it on to another wheel and see what happens? 

Mildly_Miffed

Old wheels might be corroded on the beads, but unlikely on something new enough to have TPMS.

It's almost certainly a nail or similar in the tyre. Whether it's repairable depends on how near the shoulder. Almost any tyre place will have a look and tell you for free while you wait.

strawb_shortcake

Checking the alloys I was rather impressed there wasn't a mark on them, rather unlike my first alloys 20 something years ago.

Car is 6 years old.

Other than getting my OH to have a look and pump up we've not tried anything else 

Bigwheels1111

A water bottle with a small hole in the cap, and washing up liquid and water in it.
Squirt it over the rim and valve, look for bubbles.
Then over the tyre tread, with for bubbles again.
Fastest way to see issues.

EssexExile

baser999 said:

Perhaps it’s the actual pressure fitting on the wheel itself that’s the problem? Tried switching it on to another wheel and see what happens? 

I got the impression from the OP that the car didn't say which tyre was low, so there won't be a "pressure fitting" on the wheel. I may have got the wrong impression of course.