I have an 2008 IS250 that's throwing a bunch of codes and was hoping someone could help point me in the right direction on getting this solved.

It's throwing the following codes:
- P0171
- P0174
- P0306
- P0456

Vehicle has 244K miles on the clock. Still runs and idles fine, doesn't run any different than before. It's been throwing these codes for months now.

Some kind of light white smoke recently developed and looks like it's coming from both sides of the motor when I pop the hood. Kind of smells like burnt rubber if I had to describe it. Kind of looks like it's coming from the exhaust manifolds. I couldn't track down where the smoke was coming from.

I replaced the MAF sensor and gas cap a couple months ago and the VSC, Check Engine, & Traction Control lights still come back on. This is before the light smoke had appeared.

Really hoping someone could help point me in the right direction on getting this fixed.

 

Does the ABS light also come on?

 

the first two codes can be so many things that has to do with the valve mechanism, the MAF sensor that u replaced did you get OEM(Denso) or aftermarket?

 

Those codes make me think you have a vacuum leak somewhere, which could explain the smoke/smell.

 

Yes, the ABS light is actually on.

 

Yes, OEM MAF sensor and OEM gas cap.

 

Could the issue be brake related? I had somewhat the same problem on my Lexus. Turns out it was the brake booster leaking a little into the vacuum system which sent the fluid into the engine and it was just coming out through the exhausts as white smoke.