Hi
I have an MOT problem with my punto, it is showing following readings for emission
CO 9.96% should be 0.3%
HC 740 ppm should be 200
lambda 0.72 should be between 0.97 and 1.03

The garage has asked both catalytic converter and sensor to be replaced at a cost of about 500, I want to know whether these readings suggest a definite failure or something can be done to tune? also are both components failed ?
The car had a fault code P0130 recorded in fault code but EMS light is not on now.
The car drives OK and has been recently serviced as well.

The Lambda is cheap to replace so do that first.

The catalyst should be burning off the excess fuel and therefore be hotter at the outlet end. If its the same all the way down it may well need a new cat.

However £500 is silly money.
http://shop.ebay.co.uk/i.html?_nkw=...atalyst&_osacat=0&_trksid=p3286.c0.m270.l1313

i agree with whitesei, Try the lamba sensor first, as that reads the CO2 Rating in the cat, if the sensor plays up, the wrong amount of fuel is given and yours car isn't ejecting the right fumes

if the sensor has been giving a false reading for a while the cat then may be Caked up

A good hard Run (ie Exercise the engine well in each gear) and good long run with a cleaner in will help clear the cat out

And Hopefully A pass for your MOT

Ziggy

Hi
thanks for your replies, I am getting one from euro parts
http://www.eurocarparts.com/ecp/k/catalytic/p/Car-Parts

Has anyone used them and are they good on Punto?

Also, will someone know how much does it cost to fix them?

So before buying you've proved the cat and/or lambda are actually faulty?

No, not so far, I am taking it to another garage today to recheck.

For what it costs to fit a catalyst (not much) its worth trying a used one from a breakers.