echoes

Hi there,

I have this error code (P2187 The mixture (cylinder bank 1) is too lean at idle speed.) for close to a year now which displayed the Check Engine Light in my car (W204 - C200 Kompressor sedan). I recently went to a repair shop to fix this and they changed both of my Oxygen sensors (costed me around $300 USD) but the problem still remains. The mechanic also checked my hoses and said they were fine. I am now puzzled now on how to solve this problem.

Does anyone have any idea? A couple of symptoms that I am facing along with this issue below:-

1. Some times my engine would misfire on the first engine start. This happens intermittently. It is not related to the car battery because I have a new AGM battery.
2. During early morning cold starts, there is a whistling noise from the front part of the car (near the air filter) for about 1 minute. Driving the car with the noise will be sluggish. So I usually wait for a minute for the noise to go away and the car will drive just fine.

Appreciate if anyone can provide some input on this issue. I also have an OBD (iCarsoft MB2) which I used to clear the error codes but the errors returned.

Attaching pictures of the error below:-
Error code displayed using iCarsoft MB2 OBD.