2006 Mercedes-Benz E350 4MATIC Questions

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If it is the aux battery, where is it located?
I have replaced the secondary air pump and vacuums, but code still persist as well as check engine light. I have fail emissions because of check engine light still reads same code default. P0410. What else could it be. I am losing my mind as well $$$$$$ Help please!!!!
Mỹ serpentine belt broke. Since I can't drive it to dealership, I had a mobile mechanic come to replace the belt. The pully on the tensioner was wobble, but I did not replace it until I have ever more money. After two weeks, the belt got slice. So I have another mechanic replace the belt and tensioner. The car had trouble starting but it ran a little and I tested starating the car. It was ok. 3 days later, I started the car. It start, but after halunch a block. The car dies. Had another mechanic stop by, and he thinks it may be the fuel injector or fuel pump. He was just guessing. Could the car be in termination mode like when the car get into an accident. Please help if you can. Thanks
Service C is being flash on display, due in 28 days,,,

What does Service C provide????
No shimmy in the wheel, the car rides fine and straight. There is a little chatter when I put on the break, but the car does not pull to either side. The road noise increases with speed.
I had codes P0300, P3004, P3005, and P3006 on my 2006 Mercedes. Anything related to the catalytic converter is covered under federal emissions standards of 8yr/80k. It is actually listed on the EPA website as one of 3 major components covered. The other 2 are the electronic emissions control unit or computer (ECU) and the onboard emissions diagnostic device or computer (OBD).
My independent MB mechanic believes the catalytic converter needs to be replaced. Is this covered under federal emissions warranty of 8yr/80k? I am in Miami if anyone knows a dealer who will replace under warranty.
I hear a tapping sound during idle,car has been recently serviced by dealer
I could be driving and when I come to a stopp sign the front drivers side parking sensor will sound off. How can I fix this problem myself?? dealership wanted $220 for diagnostics test + additional for parts and labor. Would have cost mne $500. That buyes a hell of alot of groceries at Costco.
drove my down to Dallas from irving and everything was fine. I went to get back into ai after lunch and i would not start, it had plents of Amps but wouldnt turn over, I waited for 3 hours trying on and off before getting it towed, for the last week I would try to start it every morning and today it started, I let it run for a few minutes and drove it around my hotel but im afraid to take it out, any advice?
2006 Mercedes e 350 4matic.
when i turn left or right i low speeds vehicle vibrates
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