Hi guys.. well i just barely picked up my DAD's 95 c280 and its been good the first week and noticed the check engine light came on. I rented a OBD II Scanner and read the codes -

PO411 comes up as "Secondary Air Injection Improper Flow Detected

i haven't found any information on this issue and wondering if u guys have any idea how to fix this?

Also just recently a week after this code the car is now idleing around 500-600 and is very rough seems like it wants to die or something on stop and go traffic.. it isn't as bad when its in Park.. but its still noticiable.. From what i have read it Possibly could be the MAF sensor but i'm unsure how to tell if it is the problem since the code for it hasn't come up and since a common symptom for the sensor failing is jerkyness on shifting and the shifts so far has been smooth.

another issue that maybe u guys can help also is that my gas gauge doesn't want to come up sometimes the light for low gas still comes on when it is low.. also the speedometer doesn't work unless i hit the gauge cluster.. i'm starting to assume its the guage cluster.. but i'm unsure if this is a common problem with other 202's.

Thanks you guys and my 202 has just above 100,000