****Update Fixed!****


I keep receiving this code with CEL and VSC. Along with a pungent rotten egg smell and a rough idle. The smell and rough idle ONLY happens when the code pops up or about to pop up. When the code goes away the car is silky smooth and the exhaust odorless.

I have cleaned both MAF and swapped sides to see if the code would change to P0171 but it didn't. Code was still P0174 after it reoccured so I'm guessing its not the MAF.

Help Please!
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Im bored so I figured I would update this to help someone out if they have the same problem.


Changing my valve cover gasket and O2 sensor did remedy this issue. Here I am a year later and the check engine light never returned.
Car had a slight vibration at idle too because of the bad signals the old O2 was sending to the computer; all of this subsided!

 

I dont know what model you have, but my 600HL got the VSC light and ABS light and rotten egg smell. The car lived its own life until I found the Problem. The 12V battery was bad.

 

Check the 02 sensors, valve cover gasket, and high pressure fuel pump. Make sure it's not leaking gas into the o2 sensors.

 

Thanks this was a great recommendation. The entire bank 2 side is soaked including the O2 sensor. I am going to replace the valve cover gasket, all the fuel pump and spark plug gaskets too. Hopefully I can reach the O2 sensor from the bottom.

 

VSC , ABS and Brake light turned on yesterday on my 2007 LS 460 during the emission inspection.
The car jerks on braking. Any idea how to reset?

 

any update to this?