Car won't start!
 

So my 2009 is250 RWD sat for about 3 months until I finally got the time to swap out alternators. I had the battery checked out ahead of time and it's only a year old. So the other day I get the alternator on and than sat it on the trickle charger over night. The car cranks but will not start. So I checked for codes and got p0335 and p0340. I've cleaned the sensors and checked all my fuses and everything checks out, I can hear my fuel pump prime when I turn the car on. So last night I step out to grab something from a different car and my lights are flashing, interior and exterior including a few on the dash and there was a ping coming from under the hood and the keyfob wouldn't work. Now this morning the fob works but the flickering lights went away. Anybody have an advice on what to check? Any help will be appreciated. Thank you.

Try change the battery. The last 2 times my car acts extremely weird is because of bad battery.

The battery has a warranty, turn it in and get a new one. That eliminates a bad battery. Lesson learned, put your car on trickle charger if storing away or not being in use.

I took my battery in, turns out it was defective. But it still won't start. It sounds like it wants to but nothing. I will post a video of it cranking to see what you guys think.

I was wondering if you have any updates? Were you able to get the car to start? My is250 was sitting for awhile as well. I got a new battery and car cranks but won't start. I changed out the fuel pressure sensors as the next common issue. It still only cranks but won't start. The car is showing no codes on the reader. I tried using starting fluid the car was able to start once for a few seconds then turned off. If anyone can provide any input would be awesome! Thanks!!!

FYI...It turned out to be a bad fuel pump. Swapped it out and she started right up! Hope this helps anyone with a similar issuel