Ford Mondeo NCT Emissions FAIL

zapata

How do all.
My 1999, 1.6 petrol, black top engine, mondeo failed CO emissions.
Results

Engine/Oil Temperature 82 celcius

Low idle CO 0.05 vol%
(700 rpm) HC 0 ppm

High idle Lambda: 0.985
(3130 rpm) CO 0.38 vol% above 0.3 % fail
HC 120 ppm

Any ideas lads on a solution?

JHMEG

Hi CO usually means the cat is gone.

Mr.Diagnostic

JHMEG wrote:

Hi CO usually means the cat is gone.

Not true, high CO usually means that the engine is running rich, ie. there is too much fuel in the fuel/air mixture. it can also be caused by an inefficent Cat.

In this case the normal Lambda combined with the slightly high CO and HC could indicate a Cat problem. The difficulty here is that the NCT fail sheet does not show enough info to allow a good diagnosis.

zapata

Is it safe to say that the o2 sensor\lambda is working ok?
Or could it be sending wrong info to ECU causing rich running issues.
I might remove it for inspection. (Non serviceable part)

JHMEG

Mr.Diagnostic wrote:

Not true, high CO

Ok, in reverse: A busted cat will, among other things, allow too much CO out the tailpipe.

Mr.Diagnostic

zapata wrote:

Is it safe to say that the o2 sensor\lambda is working ok?
Or could it be sending wrong info to ECU causing rich running issues.
I might remove it for inspection. (Non serviceable part)

There is not enough data to say that for certain but it is likely. If I had to put a % on it I would say its about 95% sure.

Lambda readings from a gas Analyser and the Lambda/O2 Sensor are not directly related.