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Mark
Mark, Technician
Category: Car
Satisfied Customers: 1504
Experience:  Qualified City & Guilds
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Ford Focus 03 just failed NCT on Emissions. Readings are

Resolved Question:

Ford Focus 03 just failed NCT on Emissions. Readings are Low idle (810rpm) CO 2.15 vol% HC 601ppm. High idle (2970rpm) Lamnda 0.76 CO 8.32 vol% HC 776ppm. What do I do from there. Just had a service 3 weeks ago.   Petrol Car.  Heard about synthetic oil? Wld that help?

Submitted: 3 years ago.
Category: Car
Expert:  Mark replied 3 years ago.

Mark :

Hello, my name is XXXXX XXXXX I will try help you with this.

Mark :

Does the engine run ok? No misfire or lack of power?

Mark :

Do you have a reading for CO2?

Customer:

Engin fine.

Customer:

I sound like a twit but it either says CO 2 and reading .15 vol% or CO 2.15 Low idel

Customer:

and CO 8 with reading .32 vol% or CO 8.32 high idel

Mark :

CO2 is another gas that some testers will show. I just hoped it would be on the printout.

Mark :

Does the engine run ok as I asked earlier?

Customer:

Yeap engin is fine.

Mark :

These readings suggest the engine is running with a rich mixture.

Mark :

Possible causes are a blocked air filter, blocked fuel return causing high fuel pressure, engine misfire with a vacuum leak, faulty catalyst.

Customer:

So you would recomend replacing the catalyst. Is there any point in trying the synthetic oil instead of the normal.

Mark :

Replacing the oil might be better slightly but I don't think it will make that much of a difference to bring the emissions within limits.

Mark :

I wouldn't change the catalyst without checking all the other things first.

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