mot decat issues
06 September 2018, 10:42 AM
#1
Scooby Regular
Thread Starter
mot decat issues
bought a 2004 STI in January , just took it for the MOT and failed on emissions , had it on the ramp and it was due to a decaf centre pipe , had to get a standard pipe fitted to pass , anyone else had this problem ??? apparently it due to new rules this year is that so ???
06 September 2018, 01:42 PM
#6
bought a 2004 STI in January , just took it for the MOT and failed on emissions , had it on the ramp and it was due to a decaf centre pipe , had to get a standard pipe fitted to pass , anyone else had this problem ??? apparently it due to new rules this year is that so ???
06 September 2018, 03:09 PM
#7
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06 September 2018, 03:54 PM
#8
Scooby Regular
Thread Starter
the thing was I didn't know it had been done , the dealer never mentioned it 
I think the previous owner must have put the decal on after the last MOT , , the reason I say that is it looks new compared to the rest fo the system , ah well live and learn
I think the previous owner must have put the decal on after the last MOT , , the reason I say that is it looks new compared to the rest fo the system , ah well live and learn
06 September 2018, 03:55 PM
#9
Scooby Regular
Thread Starter
06 September 2018, 04:26 PM
#13
WRX (pre-hawkeye) has 3 cats, one in up-pipe, one in downpipe and one after downpipe. You can get rid of the up-pipe and second cat leaving the downpipe cat in place and it will still pass MOT.
STI's only have 2 cats as there is no cat in the up-pipe, you can remove the second cat and it will still pass MOT.
Or remove them all and fit a sports cat downpipe.
Or find a friendly MOT station.
06 September 2018, 04:28 PM
#14
Scooby Regular
Not sure if there is any truth in this but i am gona put it out there,
When i owned my Glanza i was told that if i fitted it with a GT-Turbo pre 1992 engine it wouldn't need Cat as wasn't law back then,
Could you use this grey area to rebuild and fit and older EJ20 and get away with it ?
I was under the impression that if it is a legit engine swap DVLA notified then engine is tested to rules of its year and not the chassis its fitted to
Any MOT testers able to Debunk this with legit reasons, rules why ??
When i owned my Glanza i was told that if i fitted it with a GT-Turbo pre 1992 engine it wouldn't need Cat as wasn't law back then,
Could you use this grey area to rebuild and fit and older EJ20 and get away with it ?
I was under the impression that if it is a legit engine swap DVLA notified then engine is tested to rules of its year and not the chassis its fitted to
Any MOT testers able to Debunk this with legit reasons, rules why ??
06 September 2018, 04:33 PM
#15
Scooby Regular
My understanding was the centre pipe on an sti is just a silencer and not a cat , i have two fsti and it’s definitely just a silencer , the down pipe i think is the only cat , which can be changed to a sports cat and still pass an mot or is the impreza different ?
06 September 2018, 04:40 PM
#16
Not sure if there is any truth in this but i am gona put it out there,
When i owned my Glanza i was told that if i fitted it with a GT-Turbo pre 1992 engine it wouldn't need Cat as wasn't law back then,
Could you use this grey area to rebuild and fit and older EJ20 and get away with it ?
I was under the impression that if it is a legit engine swap DVLA notified then engine is tested to rules of its year and not the chassis its fitted to
Any MOT testers able to Debunk this with legit reasons, rules why ??
When i owned my Glanza i was told that if i fitted it with a GT-Turbo pre 1992 engine it wouldn't need Cat as wasn't law back then,
Could you use this grey area to rebuild and fit and older EJ20 and get away with it ?
I was under the impression that if it is a legit engine swap DVLA notified then engine is tested to rules of its year and not the chassis its fitted to
Any MOT testers able to Debunk this with legit reasons, rules why ??
06 September 2018, 04:46 PM
#18
Scooby Regular
06 September 2018, 04:52 PM
#19
Scooby Regular
06 September 2018, 05:01 PM
#21
https://www.gov.uk/emissions-testing
I also own old cars and have tested many a vehicle that didn't need emissions testing, always by age of vehicle on the number plate. Never by engine age.
06 September 2018, 05:08 PM
#22
Scooby Regular
Yep
https://www.gov.uk/emissions-testing
I also own old cars and have tested many a vehicle that didn't need emissions testing, always by age of vehicle on the number plate. Never by engine age.
https://www.gov.uk/emissions-testing
I also own old cars and have tested many a vehicle that didn't need emissions testing, always by age of vehicle on the number plate. Never by engine age.
the rules state that test to oldest engine/chassis if pre 2002
and i didnt say it would get no emmissions test.
it would be tested to the rules that were out when engine was new.
that snippet i took was from the rules so clearly must have been true at one point whether u personally did or did not ?
06 September 2018, 05:17 PM
#23
Thats not really a reason tho.
the rules state that test to oldest engine/chassis if pre 2002
and i didnt say it would get no emmissions test.
it would be tested to the rules that were out when engine was new.
that snippet i took was from the rules so clearly must have been true at one point whether u personally did or did not ?
the rules state that test to oldest engine/chassis if pre 2002
and i didnt say it would get no emmissions test.
it would be tested to the rules that were out when engine was new.
that snippet i took was from the rules so clearly must have been true at one point whether u personally did or did not ?
Any vehicle built after 1992 must have a catalytic converter present and CAT must be tested as part of the MOT test.
06 September 2018, 05:24 PM
#24
Scooby Regular
Any vehicle built after 1975 must be emissions tested, but is not required to have a cat fitted and will have to pass pre-cat levels. I have a 1963 beetle, so it doesn't get checked at all.
Any vehicle built after 1992 must have a catalytic converter present and CAT must be tested as part of the MOT test.
Any vehicle built after 1992 must have a catalytic converter present and CAT must be tested as part of the MOT test.
ok trying to keep this relevant to what i originally asked and u says was nonsense.
if i fit a 1992 engine to my pre 2002 car then it would be tested to 1992 rules ?
so what i says was correct.
before 2002 u test to whichever is older.
and therefore is this a loophole we couod use to rebuild older engines and pass emissions.
06 September 2018, 05:31 PM
#26
ok trying to keep this relevant to what i originally asked and u says was nonsense.
if i fit a 1992 engine to my pre 2002 car then it would be tested to 1992 rules ?
so what i says was correct.
before 2002 u test to whichever is older.
and therefore is this a loophole we couod use to rebuild older engines and pass emissions.
if i fit a 1992 engine to my pre 2002 car then it would be tested to 1992 rules ?
so what i says was correct.
before 2002 u test to whichever is older.
and therefore is this a loophole we couod use to rebuild older engines and pass emissions.
06 September 2018, 09:58 PM
#29
Think you may have failed due to the rule that if a cat was present when the vehicle was new it needs to be in place, technically a ppp pack could fail if this rule is taken to the extreme, however a ppp centre decat still has the heat shields in place so looks like a standard section, hence most mot stations wouldn’t know anyway,
you could always fit cat shields to a decat pipe as per ppp then would probably be ok. And technically a sport cat could fail as it probably hasn’t got the correct eu type approval code on it. Most are sold as off road only.
you could always fit cat shields to a decat pipe as per ppp then would probably be ok. And technically a sport cat could fail as it probably hasn’t got the correct eu type approval code on it. Most are sold as off road only.