EML and the MOT

Car Mechanics (UK) - - Help! -

The en­gine man­age­ment light has il­lu­mi­nated in my 2001 Re­nault Clio 1.4 16v with the K4J en­gine. The last three times this light came on, around six years ago, I re­quired two new Lambda sen­sors and a cat­alytic con­verter, plus there was an is­sue with the qual­ity of the fuel.

Given the car is due its MOT, will this light cause the ve­hi­cle to fail? Is the prob­lem likely to have the same cause as last time? The ve­hi­cle runs fine oth­er­wise, with no un­usual noises com­ing from ei­ther the car or the en­gine. John King

Al­though the MOT was up­dated to in­clude many warn­ing lights in the ve­hi­cle, these all re­late to ar­eas of safety. The steer­ing, park­ing brake, brak­ing sys­tem, sta­bil­ity con­trol, ABA, ESC, seat­belt re­straint sys­tem and, on newer ve­hi­cles, the tyre pres­sure mon­i­tor­ing sys­tem warn­ing light are in­cluded in the test. Hav­ing been through the man­ual to double-check, there is no rea­son the ve­hi­cle should not pass the test sim­ply be­cause the EML is on. How­ever, it might be the case that the light is on be­cause of a fail­ure that will af­fect the emis­sions, in which case the ve­hi­cle will fail the emis­sions test.

Be­cause of the wide range of faults that can trig­ger a code and il­lu­mi­nate the EML, it is dif­fi­cult to pin­point the cause and I would rec­om­mend get­ting the codes read to cor­rectly di­ag­nose this.

The Clio en­gine man­age­ment light (EML).

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