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Old 03-10-2008, 18:02   #1
franekglowacki@
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HELP!! MOT fail low&high idle speed!

just MOT'd my wee rover 200vi today and was shocked to find it had failed on emissions, namely low idle speed and high idle speed. the mechanic says its almost certainly the CAT but the exhaust system is barely 5 months old!
anyone else had a similar problem or can anyone tell me what , if anything apart from the CAT it may be? any similar experiences?
any help or info massively appreciated.
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Old 03-10-2008, 20:19   #2
squeakmillward
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Originally Posted by franekglowacki@ View Post
just MOT'd my wee rover 200vi today and was shocked to find it had failed on emissions, namely low idle speed and high idle speed. the mechanic says its almost certainly the CAT but the exhaust system is barely 5 months old!
anyone else had a similar problem or can anyone tell me what , if anything apart from the CAT it may be? any similar experiences?
any help or info massively appreciated.
check all the vaccum hoses for splits
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Old 03-10-2008, 20:33   #3
SammyP
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Give it a right good thrashing before you arrive, then tell them to test emmisions first. Cats on K series cars need to be red hot to work properly.
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Old 04-10-2008, 16:54   #4
LORDPSK
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Hi,had same problem on a 2001 25 1.4, ended up changing the whole exhaust system including the cat, changed the lamba sensors and also changed the fueland air filter. could have gone further by changing spark plugs and leads as these can also give a mis reading.
I turn the hot air off going into the car when they goformot tomake sure allthe heat is in the engine making the cat workcorectly
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Old 04-10-2008, 17:12   #5
Tony White
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Change the oil, Add some oil treatment and give it a good thrash before going to the MOT test and drive straight to the test and ask for the emissions to be done first whilst the car is running and the exhaust is hot so as not to waste time.

It's more likely, I think, That the lambda is a bigger suspected culprit than the cat.
However there are many reasons for poor emissions and sometimes they can be hard to find.
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Old 12-10-2008, 19:29   #6
franekglowacki@
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previous post

big thx to all who responded. it was indeed the oxygen sensor. replaced and serviced now all is good again.
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