Please decipher these Emissions.

martinn123

Hi Guys

failed the NCT on Emissions

It's an 01 Ford Focus, petrol, 1.5

As one who knows nothing about engines I need some of your thoughts before I talk to my garage.
Had a full service on the car carried out last week, nothing to report.

Engine Temp, 104 deg C

Low Idle 800 rpm

CO 1.46 vol%
HC 630ppm

High Idle 2870 rpm

Lambda 0.79
CO 7.49 vol%
HC 958 ppm

Be gentle with me, and thanks in advance.

Your car needs to be properly diagnosed. It's running very very rich so it's something like a failed air flow meter and/or map sensor (or connection to map). Take it to a place that specialises in fuel injection issues.

PS. You'll most likely need a new cat after the rest is repaired if the car was driven like that for any length of time. But bad cat is not the reason for your emissions, just the unfortunate bystander.

jimgoose

Like samih says - those figures mean too little air and too much fuel. This sort of thing is usually caused by something relatively simple like a sensor or a split hose. He's also quite right when he says running like this might damage the cat. You'll have a fair idea if this is the case if the Lamda goes high while CO and HC also stay high after the original issue is fixed.