Recent MOT changes and putting in modded car for said MOT
Recent MOT changes and putting in modded car for said MOT
Author
Discussion

anonymous-user

Original Poster:

83 months

Monday 9th December 2019
quotequote all
Hey Everyone,

I am hoping someone can help clarify some items on this...

My car is due to go in for MOT and it is running boosted power levels (all work done by a recognised and respected tuner). The previous owner however put a decat rather than a sports cat on it and get it all as it should be. It is time to fix that as it makes me feel bad anyhow.

However, having spoken to the tuner, they are saying that due to MOT changes, nothing but bone stock will pass? I can't see this being quite correct as the tuning scene would die overnight.

What's the reality of getting an MOT on a modified performance vehicle.

Bigends

6,156 posts

157 months

Monday 9th December 2019
quotequote all
You need to make friends with an MOT tester. Take your car in, explain the tester exactly whats been done to the car - see what they say.

Edited by Bigends on Monday 9th December 14:34

anonymous-user

Original Poster:

83 months

Monday 9th December 2019
quotequote all
It's done on emissions. Thats the end of it really.

shovelheadrob

1,564 posts

200 months

Monday 9th December 2019
quotequote all
flashbang said:
It's done on emissions. Thats the end of it really.
There's a visual inspection too, if the vehicle was built fitted with a cat, then it must have one for the MOT. If the decat pipe looks like a cat then it will probably be ok. Some testers may be more picky than others. The fact that it might pass emissions without is irrelevant.

spookly

4,391 posts

124 months

Monday 9th December 2019
quotequote all
MOT tests also aren't meant to remove anything to inspect. If the cat (or lack thereof) isn't externally visible then they can't check. If you had a nice heat shield obscuring observation then you'd be ok.

AJB88

15,781 posts

200 months

Monday 9th December 2019
quotequote all
Sports cat can be fitted as its still got a cat, as long as the emissions pass it will be fine. As said though if the cat is also hidden then they cant tell anyway.

sospan

2,755 posts

251 months

Monday 9th December 2019
quotequote all
If the engine is meant to have a cat in original spec then it must be there ( visual check). If no tuning mods and cat removed then it is an automatic fail, irrelevant to emissions being in spec.. I don’t think the tuning mods exempt the need for a cat.
You might get away with it if you have a fake cat visible or even a heatshield sealing off where the cat should be and emissions are OK. What about Lambda sensors pre and post cat ( my car has both) ? If they should be there then that is another clue to check.
The MOT requirements take the engine into account re age etc and differing requirements apply from simple visual exhaust to full test.
A mate had a similar car to me and de-catted it. He had a “sympathetic” MOT tester! I wondered what would be the outcome if he was involved in a nasty crash and the car was inspected by police/ insurer.

anonymous-user

Original Poster:

83 months

Monday 9th December 2019
quotequote all
shovelheadrob said:
flashbang said:
It's done on emissions. Thats the end of it really.
There's a visual inspection too, if the vehicle was built fitted with a cat, then it must have one for the MOT. If the decat pipe looks like a cat then it will probably be ok. Some testers may be more picky than others. The fact that it might pass emissions without is irrelevant.
Sorry, I didn't make myself clear enough. I was only talking about cats due to what the "tuner" told the OP about it having to be a stock only cat.

mmm-five

12,357 posts

313 months

Monday 9th December 2019
quotequote all
Doesn't the MOT also now check for 'check engine' lights on the dash?

If this was triggered due to lack of cats, and has been coded out, will the 'check engine' light still be there when you first turn it on?

anonymous-user

Original Poster:

83 months

Monday 9th December 2019
quotequote all
mmm-five said:
Doesn't the MOT also now check for 'check engine' lights on the dash?

If this was triggered due to lack of cats, and has been coded out, will the 'check engine' light still be there when you first turn it on?
A check engine light should be on with ignition until the engine starts then should go off.

AJB88

15,781 posts

200 months

Monday 9th December 2019
quotequote all
Light will come on with ignition but will go off when started as it will have been either coded out or a spacer put on the sensor.

mmm-five

12,357 posts

313 months

Monday 9th December 2019
quotequote all
AJB88 said:
Light will come on with ignition but will go off when started as it will have been either coded out or a spacer put on the sensor.
Good to know - if I ever need it smile

norm4n

46 posts

249 months

Thursday 12th December 2019
quotequote all
3 options;

Install cat for MOT and remove afterward (bit of a hassle I’ve done it)

Install a sports cat (I’ve had no trouble passing MOT’s for years with this)

Buy a used standard cat and remove the internals creating a high-flowing lookalike cat