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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
Vehicles, CarsWrong Control System
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

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Emission Control Light On? - Causes & Fixes