Renault Scenic - Faulty Coils Causing Warning Light(Including General Info)*fixed* - Page 18 - Renault Forums :: Independent Renault forum

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post #86 of 121 (permalink) Old 24th February 2012
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Re: Renault Scenic - Faulty Coils Causing Warning Light(Including General Info)*fixed

If this warning light illuminates continuously, then you should consult your Renault dealer ASAP. The next stage logo has 'STOP' showing within this engine logo - And that does mean STOP Now!
So it could be worse.
Normally if everything is OK with the engine, this logo
lights up when you start up the engine, then goes off after a few seconds. Presumably after the engine management has found that part of the system OK.

It is monitoring the exhaust gas emissions.

Yes! A faulty coil could be responsible, since a poor or no spark on one cylinder would be sending unburnt fuel to the exhaust system, that would be picked up by the sensor.

If you know someone with a system checking device,
then this will give a read out and area to repair. Or try changing a coil . A favorite of mine -see Megane.
However buying spares which may not be needed
is a waste -Sadly some garages do charge heavily for
using their engine analysis equipment. My last quote for just a plug in & readout was 45.
(Pencil coils 15 -40 each)
Regards
SamWoerth
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post #87 of 121 (permalink) Old 24th February 2012
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Exclamation Re: Renault Scenic - Faulty Coils Causing Warning Light(Including General Info)*fixed

Please note the picture which comes up,when you
click on 'blued coil ' in Renault Forums emails -
Is not a pencil coil .
See Megane pictures -SamWoerth.

If you try to locate the 'blued coil ' shown you may have to look at the engine of another manufacturer.

SamWoe
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post #88 of 121 (permalink) Old 21st March 2012
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Re: Renault Scenic - Faulty Coils Causing Warning Light(Including General Info)*fixed

The coils made from Sagem (French company... and I am french, hehe...), which came on many Scenic 1 phase 2, are really really bad. I got lucky and got mine with Denso coils , they made more than 100000 kms, but only 40K for my father's Sagem ... The design is intrinscally bad as the coil leaks current on the lower metal part which gets conductive. You can sometimes check with an ohmeter if they are good (connect one of top 2 connector and internal spring, then the other, you should have certain values, can be found easily on internet). But sometimes even coils with good values are failed. Generally you changed all 4, but this is costly so you'd better change those actionned at the same time (cylinders 1-4 (external) and 2-3 (center)).
To check if they leak, you can plug one out and see if a spark is created between the lower part of the coil and the engine block. In principle the current should only be driven internally, so if it goes outside anywhere else, your coil is defective.

I strongly recommend Denso or any brand with a similar design like Beru. Valeo also seems fine and cheaper. I do not recommend OEM replacement as you may end up with another Sagem... Going off ebay might just be a cheap replacement for 20K...

you can also replace the Torx bolts holding them by hex head bolts as the torx tend to get worn out. A set of 4 hex head size equivalent bolt with same diameter and pitch (metric obviously) should be cheap.
++
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post #89 of 121 (permalink) Old 14th June 2012
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Angry Re: Renault Scenic - Faulty Coils Causing Warning Light(Including General Info)*fixed

Sadly got the same problem. Gas light came on whilst driving home 2 days ago and started running rough. Replaced all 4 coils and plugs no change! Replaced crank shaft sensor again no change! got fault codes checked by a friend who has a Snap-On Ethos diagnostic scanner, 1 fault code from injector number 2. So decided to replace all 4. And to my surprise it's still running like a bag of ****!. Weird thing is sometimes when you start it up it will run fine for about 15 mins or so then go back to running rough with the engine rocking and car vibrating. Anyone that can shed any light on what could be wrong would be really appreciated at this time because i'm banging my head against a brick wall.
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post #90 of 121 (permalink) Old 31st August 2012
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Re: Renault Scenic - Faulty Coils Causing Warning Light(Including General Info)*fixed

this happend to me today filled my car up with petrol got about 3 miles from petrol station the my car had loss of power & management light came on ...if anyone knows how to fix this would be a great help thankyou
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