megane mot day FAILED!! OH NO!! - Renault Forums :: Independent Renault forum

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post #1 of 12 (permalink) Old 23rd August 2007 Thread Starter
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megane mot day FAILED!! OH NO!!

Well took the old girl for the test today and not good news
failed on the following

both front springs fractured (never heard off before)

but the bad thing is failed very bad on emissions

fast idle CO MAX LIMIT 0.30% READING 8.36% FAIL
LAMBDA 0.97-1.03 READING 0.77 FAIL

fast idle CO MAX LIMIT 0.30% READING 8.05% FAIL
LAMBDA 0.97-1.03 READING 0.78 FAIL

Natural idle test

CO max 0.50% READING 1.26% FAIL

any idea how to get it down? would new air filter,plugs and leads help?? and cleaning the lambda??

also was given a advisory......noisy cat
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post #2 of 12 (permalink) Old 23rd August 2007
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Hi LilMiss.

sorry to hear of your failure, Hopefully a more technical member will advise further on your emissions test.

Fractured/broken springs are quite a common occurence.
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post #3 of 12 (permalink) Old 23rd August 2007
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If your engine is overfueling that much it is possible your cat is knacked now and will need replaced this may bring it down BUT the fault which is causing the overfueling is your real problem and would kill the replacement
Faulty lambda probe can make it rich as can various other sensors

I would get a lambda probe first and see what it reads then
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post #4 of 12 (permalink) Old 24th August 2007
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Yep,I'd agree.Change the Lambda sensor and you might get lucky,but as it's been running so rich it may well have damaged the cat.

Broken springs are not uncommon now-a-days unfortunately,and it is not a Renault only problem.......

I'd rather push my Alfa than drive a BMW....
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post #5 of 12 (permalink) Old 24th August 2007
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A friend of mine had an Alfa Silverstone 155 that failed on its emissions, he thought it would need a new lambda sensor but it turned out to be a broken wire that connected to the sensor. Once it was reconnected it passed the test.
If you need new springs, perhaps now would be a good time to get lowering springs. 35mm could look quite nice.
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