Failed NCT mazda mx5

GALWAYINDOOR

hi everyone
i recently failed the nct due to emissions, the car is a 01 mazda mx5 the engine light is showing also but it didnt fail on that. what can i get done to sort this out ? about a year ago a new lambda sensor was put in but the light remained any suggestions would be great as to sort the problem.
thanks all

johnayo

GALWAYINDOOR wrote: »

hi everyone
i recently failed the nct due to emissions, the car is a 01 mazda mx5 the engine light is showing also but it didnt fail on that. what can i get done to sort this out ? about a year ago a new lambda sensor was put in but the light remained any suggestions would be great as to sort the problem.
thanks all

You will need to get it scanned and exhaust analysis by somebody competent to get it sorted. Too many possibilities to answer without seeing analysis.

Ronnie Beck

GALWAYINDOOR wrote: »

hi everyone
i recently failed the nct due to emissions, the car is a 01 mazda mx5 the engine light is showing also but it didnt fail on that. what can i get done to sort this out ? about a year ago a new lambda sensor was put in but the light remained any suggestions would be great as to sort the problem.
thanks all

Stick up all the results for the emmisions section. Lambda, CO etc.

GALWAYINDOOR

exhaust emissions

low idle above 0.50 fail
790 rpm co 0.53 vol %


high idle Lambda 1.01 not between 0.97 and1.03
3.030 rpm co 0.64 vol% above 30%
HC 73PPM above 200 ppm


also got a diagnostic test done and was told p0420 catalyst system efficency below threshold (bank 1 )

i have not a clue what the above means sorry gang just not a engine mechanic type

thanks again

George Dalton

From the figures and the fault code you posted overall it looks like you need a new catalytic converter.

101sean

My son buys from this crowd in the UK, don't know what their postage rates are like to here - http://www.mx5parts.co.uk/mk225-19982005-c-72_74.html

Mk2 cats look expensive but they do cheaper aftermarket ones.

Esel

101sean wrote: »

My son buys from this crowd in the UK, don't know what their postage rates are like to here - http://www.mx5parts.co.uk/mk225-19982005-c-72_74.html

Mk2 cats look expensive but they do cheaper aftermarket ones.

Not a bad price, if the cat is the problem.

mathepac

GALWAYINDOOR wrote: »

hi everyone
i recently failed the nct due to emissions ...

Stop eating beans and retake the test.

enumbers

really does look like a cat issue and I hate diagnosing emissions faults without having the car infront of me

Nissan doctor

As said, it looks like a cat will solve the emission issues in the short term at least but you would want to have the cause of the cat failure diagnosed. Things like poor combustion/misfires/plug spec/lambda issues amongst others are the common reasons for cat failure.

enumbers

The lamda seems to be bang on it the test results and the hcs are not high so possibly an old issue that damaged the cat

galwaytt

Esel wrote: »

Not a bad price, if the cat is the problem.

....two reviews of that particular one claim is doesn't work........just be careful......