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Car mechanics advice needed.

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Good evening.

 

My wifes car has failed its MOT on the fuel emissions. I have changed the back box as it had a hole in and also the cat section.

 

It is still failing on emissions.

 

Does the cat need to be run in? Is there anything else i should be looking at doing?

 

Car is an X Reg 1.1 Clio Grande

 

Thanks

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Do you give it a good Italian tune-up before it go's in for the test?

 

Have you read any fault codes, could be something like the engine temp sensor.

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Good evening.

 

My wifes car has failed its MOT on the fuel emissions. I have changed the back box as it had a hole in and also the cat section.

 

It is still failing on emissions.

 

Does the cat need to be run in? Is there anything else i should be looking at doing?

 

Car is an X Reg 1.1 Clio Grande

 

Thanks

 

try changing the lamda sensor, its positioned on the exhaust just behind the cat

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Put some engine cleaner in called forte never fails

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Post the readings on here and we'll have a better chance of advising you.

 

A blowing exhaust can cause a high lambda reading but you have sorted that. High HC is unburnt fuel so a possible misfire and high CO could be a faulty cat, but you've replaced that. Also a blocked air filter and dirty oil can cause high CO.

 

When was the last time it had an oil and filter and air filter?

 

And no a catalytic converter doesn't have to be run in.

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Put some engine cleaner in called forte never fails

 

I use Forte fuel system treatment every service in my van and car, its top stuff! :thumbsup:

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