Exhaust emission values

The other day, I took my 2005 model 307 petrol vehicle to the fiat service for exhaust inspection. Lamda value first appeared in 10-odd. Then they pushed the apparatus a little further, and Lamda, CO values were higher than normal.

They said because your exhaust was breaking out. I really am from exo. So, is there a high value or what other problems? Could it be spark plugs, for example?

First of all, you need to introduce yourself according to the format in the meeting section for new members. Thank you for your sensitivity.

If we come to the problem, there may be many reasons .. spark plug, catalytic convector, lambda sensor .. how is the fuel performance of the vehicle? how many km .. is the floor still in place ??

You said that the apparatus gave 10 lambda first, 10 lambda is a very fantastic value. Can we trust the calibration of the instrument and your muffler is not dried out ??

My fuel consumption is around 8 liters in the city. The floor is still in place, at least I know it, I never touched it :)

I last replaced the spark plugs 20,000 km ago, but on traction, etc. There is no problem.

The exhaust had exploded before and I had it welded 2 years ago. At that time, the test was without problems.

It is established. I just showed it to the exhauster, the last silencer is finished. He said he was throwing out a lot of noise and he dropped a price of 160 liras

Obviously, I am willing to change the problem rather than just the muffler. I want to have it measured again somewhere else tomorrow. But when I have my hand touched, can I renew the spark plugs and try it? Or if I get another surprise, I want my preparedness: s

If the lambda sensor is faulty, I think the engine should not work at those values?