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what is wrong if my emission control system light stays on?

what is wrong if my emission control light stays on
rich griff, May 2011
Could be a faulty number 2 lambda sensor, failing catalytic converter, or the engine is running so badly the cat cannot clean up the excessive emmisions.

polo, May 2011
you have a fault on whatever car you have,get it onto a code reader

cdc, May 2011