Hi so I installed my INVIDIA midpipe on my 2012 Lexus IS350, brand new the midpipe is brand new. As you know, there are no cats with this pipe. So after installing the midpipe and turning on the car for the first time, the car shuts off. So I turned it back on and I noticed I had a check engine light on. Ran through the codes and got P0031 P0051 and a few others related. I couldn’t rev the car to the max rpm I couldn’t pull the car that when the pedal is to the floor the car doesn’t wanna go. Trac is off and everytime I start the car I gotta start it twice as well as rpm’s are low when idle. From others experienced and from what I’ve seen and heard that no other with the same setup has encountered a problem like I have.

 

Have you tried unplugging the negative terminal to your battery n reconnect it the next morning?

 

As a favor to those who might help, please post all codes AND their meaning to save us from doing your work! Nothing personal, but we shouldn't be looking up every code for someone else's problem.

That said, it's likely a bad connection or a wire broke that powers the sensors. Do double check all work performed and unplug and replug both o2 sensors. Maybe you find the fault.

 

Fixed it yesterday. Had codes P0031, P0051, P0037, P0057, and P0102, I just replaced the EFI NO.2 fuse and car is fine now

 

Did that but it didn’t work. Found out it was a fuse that was blown so I replaced it and it’s all good now

 

What did you do with the downstream sensors? Did the wires short during removal and take out all sensors?