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Z3coastdriver

Newbie
Joined
Sep 29, 2025
Points
1
Model of Z
2.8
I have a 2000 Z3 2.8 cosmos black with red interior. I have owned the car for around 10 years and it's just a second car for a bit of fun.
I have just taken it for the mot and it's failed so I am completely gutted.
Has anybody had experience with the mot failure for 5.3.6 A (i) ?
It's the first time I have ever been made aware of underbody corrosion and I have never had any advisory for corrosion, it is the first time I have used the garage, so I am wondering if it's a genuine failure? Have others experienced this failure??
Thanks
 

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AntStark

Zorg Guru (III)
Supporter
British Zeds
Joined
May 15, 2021
Points
143
Location
Hampshire
Model of Z
2002 3.0 Sport
Most older/experienced MOT testers know the difference between the kind of surface corrosion you’ll see on a 20+ year old car and something terminal. Any who are used to seeing newer cars get scared and instantly fail it. Only way to tell is if you post up some pictures. Loads of experienced testers on here.
 

Mint

Zorg Expert (I)
Supporter
British Zeds
East Anglian Crew
Joined
Sep 23, 2012
Points
222
Location
Stafford
Model of Z
2.2 Sport Individual
Hi and :welcome: to the forum from me too in Stafford.
 

Z3coastdriver

Newbie
Joined
Sep 29, 2025
Points
1
Model of Z
2.8
Hi thank you for the replies, I have posted some photos of where the mot inspector chalked the sills covers. It's the first time the car went to this garage and I explained that they are sill covers and not structural, however he was not interested and would not budget. Just interested in other owners comments.
 

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Scooblitz

Zorg Guru (III)
Supporter
British Zeds
Scottish Zeds
Joined
Aug 7, 2017
Points
135
Location
Glasgow, Scotland
Model of Z
2.8
Your MOT tester doesn't know what he's looking at.

He has chalked a trim panel, The outer sill. This is not a structural component, it is simply a bolt on part, like a wing, quarter panel. Its bubbling a bit because its 20+ years old but can be replaced after a trip to your local bmw parts supplier. £400+ lighter for a pair.

Below is a borrowed photo from the internet of the structural, inner sill. The outer sill trim cover has been removed to show the condition of the structural part of the car. This is worthy of an MOT fail, required treatment and metal patchwork to make it a pass.

Inner Sill.png


If it is possible to have a word with your tester or go elsewhere for a test with a MOT tester that is aware the part you are being told is a fail is actually not a structural component.

Stevie
 
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