CAT rules on Pre '92 cars

[hunker7]

So I am a bit confused on this. My S4 is '92 (June) so legally it doesn't need a cat. How does MOT work, in my understanding they are still being tested for emissions (obviously), but are limits higher than let's say K reg car that requires CAT?

Can't seem to get a definite answer.

[newsh]

Yes

[newsh]

Although my 94 passes MOT with gutted cats anyway

[hunker7]

I am asking purely because I've been looking into getting new exhaust, and have no idea what to go for so I can pass MOT without sticked them back in everytime. Is there any information on levels it should meet?

[rj scotty]

Although my 94 passes MOT with gutted cats anyway

As dose mine. The probe acidentley falls into the exhaust of another car

[Rikki Kitto]

Don't worry if you need help getting it through the emissions we have ways of making it work, let me know if ya need help. How's the MAF? Yours fixed yet

[Rikki Kitto]

As dose mine. The probe acidentley falls into the exhaust of another car

Ooooooppps sounds familiar

[hunker7]

I am just worried because I how only half in each cat at the moment, and exhaust is in bad stateh, so got to be ready to react if u fail mot cos of exhaust.

Newsh kindly gave me some parts so I fixed my MAF. I'll be in London over weekend I'll drop yours off

[Rikki Kitto]

Nice one fella, seriously can sort the mot for ya if ya stuck

[hunker7]

Nice one fella, seriously can sort the mot for ya if ya stuck

Thanks mate. Better start looking into exhaust then ay?

[s2driveruk]

If its pre 1st August 1992 then the limits are such that you wont need a cat/cats to pass the BETS (Basic Emissions Test) anyway. It is not down to whether there is or isn't a cat present, it is whether the emissions are within the spec'd limits.

Make sure you have new air filter, oil and filter and get it hot...it should pass well within limits.

[Monkeymagic]

Max limit is 3.5 on Co mine recently passed with 0.9 and it is legally de catted. In other words I can legally remove the cat and its still well below the limit, in fact its below the limit for a car with a cat. If she is in good order then all should be fine.

[chiefmechanic]

Cats

My 93 s4 has passed the last two mots without cats. I believe the i5 engine is allowed some dispensation as it's an old design.

[hunker7]

Thanks guys for the input. This clears things up Good to hear that I can go "cheap" route regarding exhaust.

[Thuppu]

Max limit is 3.5 on Co mine recently passed with 0.9 and it is legally de catted. In other words I can legally remove the cat and its still well below the limit, in fact its below the limit for a car with a cat. If she is in good order then all should be fine.

Wow, you really have loos emission limits there. Here the Co max limit is 0.5(idle) and 0.3(@2000rpm). No chance to pass without the cat. All though with a well heated 5" 100cell cat and e85 there was no problems to pass.