E200 Kompressor failed emissions

[TheBanjoman]

Hi
i have a e200 2005 komp

failed emissions
I had one fault lambda sensor, I replaced this everything seemed fine



FIRST TEST

Low idle

CO0.67% Above 30% Result Failed



High Idle

(3.000rpm) CO.065 VOL% ABOVE 0.20% RESULT FAIL

NEXT TEST (REPLACED LAMBA SENSOR)

HIGH IDLE

CO 0.04% ABOVE 0.30% RESULT PASS

LOW IDLE

CO.041 VOL% ABOVE 0.20% RESULT FAIL

So lamba brought down high idle to near perfect it also brought down low idle from 0.65 to 0.41%
any suggestions? please

 

[DITTRICH]

If the car wasn't fully warmed up when tested? I'm speculating, but higher temperature of catalytic converter will help imho

 

[TheBanjoman]

it drove 10km to test centre im sure thats good enough?

 

[grober]

it drove 10km to test centre im sure thats good enough?

Unless its got a faulty thermostat which delays warm up time- i. e.its open all the time? Normally they should check the engine oil temperature with a probe thro the dip stick tube for the test- might be worth checking on the mot report?

 

[TheBanjoman]

Unless its got a faulty thermostat which delays warm up time- i. e.its open all the time? Normally they should check the engine oil temperature with a probe thro the dip stick tube for the test- might be worth checking on the mot report?

I have attached the two Nct reports in the first post

Oil temperature in

First
92%

Second
110%

 

[TheBanjoman]

Would replacing the 2nd lambda sensor sort this?

 

[TheBanjoman]

Would replacing the 2nd lambda sensor sort this?

 

[Bellow]

Would replacing the 2nd lambda sensor sort this?

Don't think so.
AFAIK, the first Lambda sensor controls fuelling, the second checks that the cat is working.

 

[TheBanjoman]

Would the cat be dirty considering the engine would of been running rich due to the 1st lambs sensor being faulty. maybe a cat a clean

 

[Bellow]

Would the cat be dirty considering the engine would of been running rich due to the 1st lambs sensor being faulty. maybe a cat a clean

I've not scrutinised all the numbers - but definitely 'rich'?
Unburned fuel can get to the cat if running lean and there is a misfire or incomplete burning. Cat will take a (thermal) hiding in that scenario and can burn out.
Not sure about the rich scenario - maybe the chemical action of the cat creates heat enough to burn it also (even though no oxygen - unless a misfire is present).

 

[TheBanjoman]

Hi thanks for the reply,

I have changed both lambda sensors
Put in a cataclean additive
Engine flush followed by a oil change with filter
Also added a stop smoke additive

Any ideas if this w211 e200 1.8 kompressor has a pcv valve and location?

 

[skippyjasper]

it drove 10km to test centre im sure thats good enough?

Depends on what kind of driving occurred in those 10km. If all/most was low speed stop and go, then the car was not warm enough.
Usually a 20km trip at highways speeds works best. Drive directly to the inspection station after that and leave the car idling if possible.


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