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Re: Lag 2 - toxic fume indicator
For instance a single misfiring spark plug is sufficient to allow unburnt fuel to enter the exhaust.
Sorry I don't know the exact type of spark plug required for your engine but most members of the forum recommend using Renault only as would I. Even if a tad more expensive the extra cost can be easily gained on economy.
The correct plugs may have been fitted at the time of service but only by checking will you find out.
Currently in madnoel10's garage:
Honda Civic 1.4l