anybody had the same problem and what did you do or replace to get it through the mot

 

Mine failed last Decmber they tried it three times.Took it to Midland Impreza they ended up fitting a new Lambda Sensor and it passed ! May need checking

 

Make sure its had a good blast before it goes in, to get rid of all the unburnt fuel and clear those cats out.My WRX failed ,so I went about 5 miles usng the turbo as much as poss and getting it warmed right up, returned to the garage and passed no problem.

I've made a note of this to remind me before i go for my next MOT

Davy B

 

Badgerbell is spot on. I test lots of cars with cats and 90% of the ones that fail get a thrash around the block and they fly through the test no trouble.
But there is that 10% that does'nt! (mostly lamda sensors or exhaust blows).
Cars that do town work are the worst as the cats never get up to optimum temperature to work properly.