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post #6 of 52 (permalink) Old 10th March 2006
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post #7 of 52 (permalink) Old 16th April 2006
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Unhappy Renault Megane Dynamique 2005


I have a 2005 Renault Megane with 12.000 miles on the clock. Yesterday i had the Toxic Fume Filter light come on and have not drove it since as i am worried that it may cause more damage.

Im not a mechanic so i have no idea if this is a regular thing or am i just unlucky. It is the cars fault or mine and how much is it to fix if it is not covered under warrenty.

any info would be much appreciated.


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post #8 of 52 (permalink) Old 17th April 2006
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You have probably got a faulty Ignition Coil .. If the vehicle detects a misfire then it will put the warning light on..

You are correct in not driving the vehicle, as the misfire will be dumping unburnt petrol down the cat. This will Rapidly destroy the Monolyth in the Cat..
Mind you as the vehicle is still under warranty and if the Cat did fail it would be replaced under Consiquential damage due to coil failure..

Call Renault AA assistance and they will replace the coil for you at the road side.. (the AA carry new coils on their patrols as it is probably No 1 reason for Megane 1.6 break downs) So no need to visit a dealer..

EX Renault Dealer Technician & MOT Tester, Not a Monkey!
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post #9 of 52 (permalink) Old 19th April 2006
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Had the AA out last night and his computer did detect that there was a misfire but there wasnt anymore so he couldnt do anything. He did suggest that the following morning i should get straight down to renault which i did. i was a bit moody with them saying that i wanted it looked at today which did work. It has now been sorted and they replaced one of the coils and it now runs lovely...again.

Also, how toxic are the toxic fumes? when the light came on the car started smelling really dusty. just looking after my own health.

Last edited by Eddthehammer; 19th April 2006 at 03:36 PM.
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post #10 of 52 (permalink) Old 20th April 2006
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The "toxic fumes" are contained in the exhaust system, so there's nothing to worry about from inside the car!

I had two coil packs go on my L7X engine - both rear bank, which is a manifold-off job to replace - I dunno if this unit uses the Sagem coil packs too though? The AA bloke didn't carry coils for the V6 unit on his truck though, so I had to be towed back to a garage to get it fixed.

The AA bloke was able to find out the problem though. He had an IR temperature probe, which basically shines a laser spot onto something, and then tells you the temperature of whatever you're shining the laser onto. Very clever bit of kit.

He started the engine up and waited a couple of minutes, then "shot" the laser at the top of the spark plugs - sure enough, one of them was showing a much lower temperature than the others, so we knew it was that coil pack that was at fault.

The Toxic Fume light seems to be a bit of a "jack of all trades" too - my other half had a problem with her Clio, whereby an inept Halfords mechanic unclipped a wire, which then fell down onto the cam belt, which sawed through it. This cable controlled the purge canister, and this also caused the Toxic Fume light to come on. A couple of blobs of solder and some insulating tape later, all was well

If you do have "dodgy" coils (and hell, even if you don't!) it can be a good idea to buy one and keep it in your glove box...just in case you do have a problem with them! IIRC they're not that expensive, and it could save you a lot of hassle if / when you break down.

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chugging , engines , filter , fume , megane , renault , toxic

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