FWIW. Most European cars of that era have secondary air pumps. The concertina pipes that connect the air pump to the EGR system turn into Rice Krispies after about 10 years. Leaky tubes will set an alarm. YMMV. Fred
On Fri, Dec 10, 2021 at 7:36 PM Robert Koziak via Mercedes < mercedes@okiebenz.com> wrote: > Hi all, > My daughter's 2011 C300 (90K) had a check engine light with a code > P0410 indicating an issue with the secondary air pump. I replaced the > secondary pump (which was evidently seized) and reset the code. Drove it > about 50 miles with no check engine light so I returned the car and started > a vacation about 4 hours away. > She drove the car and a few hours ago and the check engine light came > back with the same code. Should I have replaced the relay and fuse too? > The fuse looked fine when I checked it before the repair. > Does anyone have a schematic of the engine fuse box which lists the > fuse and relay locations? I can't seem to locate a good one online. I > have the fuse and relay so I could have her replace them and reset the code > to see if that fixes the problem before I return in a week. > The secondary air pump was replaced 6 years and 60K ago by the dealer > under warranty. Is this a common problem? > Thanks in advance for any assistance! > Bob K > > _______________________________________ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > -- Fred Moir Lynn MA Diesel preferred _______________________________________ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
