Decat mot pass

[Mark Bateman]

whats the chance of my leon passing the mot with the decat on. What are you guys doing for your mots

 

[Thai-wronghorse]

Very slim.

Sent from my SM-G986B using Tapatalk

 

[Legojon]

On the bright side, if it's due during lockdown, it's being extended by 6 months.

 

[bruceR]

For your info I’ve got a Miltek full exhaust with the downpipe decatted but I got a dummy cat welded on and it’s passed no bother


Sent from my iPhone using Tapatalk

 

[bruceR]

Sent from my iPhone using Tapatalk

 

[bruceR]

And it only cost £48 to weld it in


Sent from my iPhone using Tapatalk

 

[Thai-wronghorse]

I really want to stay decatted but I just know it's going to cause me grief when it comes to MOT time.

Bruce, that's not for a mk1 LCR though is it?

Sent from my SM-G986B using Tapatalk

 

[bruceR]

No mate it’s for my FR TDI


Sent from my iPhone using Tapatalk

 

[Thai-wronghorse]

Ah that's cheating, dervs are much easier to swing past the MOT when it comes to cats.

Sent from my SM-G986B using Tapatalk

 

[AndrewJB]

Just run a fake cat and drive it hard before you go in.

 

[Sharpy]

Friendly MOT tester or get a can that can be added and removed. I am intending to get one that clamps in, I can then remove it and add it back in as I wish.

 

[Rich.T]

Would swapping from cat to decat (or vice versa) cause the eml to stay on?
Tempted to fit dummy cats to mine.
Stage 1 remap 18T bam engine.

Rich

 

[Thai-wronghorse]

Would swapping from cat to decat (or vice versa) cause the eml to stay on?
Tempted to fit dummy cats to mine.
Stage 1 remap 18T bam engine.

Rich

Yes, it'll need mapping out. I know you can get lambda sensor probe extensions to put it further away from the exhaust gases which can help to trick the ECU into thinking its closer to its parameters but it's not guaranteed.
I have one on my decat but as I didn't map the car I have no idea if its needed or not without experimenting first.

Sent from my SM-G986B using Tapatalk

 

[Rich.T]

Nothing's ever simple is it!

 

[SlashProm]

Removing the cat will give you an EML for the secondary 02 sensor which measures the efficiency of your cat. Your best bet is to create a swap out section for the mot, or just put the cat back on for an mot if you've straight swapped it for a decat downpipe like I did. Regardless of emissions if there is no cat on your car it will fail a visual inspection before it ever gets on an emissions test. So if your mot guy wont run another car for you for the test. Your going to need a cat.

 

[Sparkie]

Bolt in, bolt out.


Badger5 Custom Map + TIP,
3”Custom exhaust, FMIC, Bosh 550’s, BC Coilovers, ARB’s +loads more.

 

[Connor H]

Yes, it'll need mapping out. I know you can get lambda sensor probe extensions to put it further away from the exhaust gases which can help to trick the ECU into thinking its closer to its parameters but it's not guaranteed.
I have one on my decat but as I didn't map the car I have no idea if its needed or not without experimenting first.

Sent from my SM-G986B using Tapatalk

I fitted one of the right angle spacers and it worked a treat. It's actually still on with my sport cat now simply because it wasnt throwing a light up either way. Suppose it would be better to have the sensor in but need to extend the cable.