Boxster Error Code P134
 

Can anyone help me determine how to resolve this problem. I initally had code that the dealer was a shut-off valve replacement and I replaced it. The next code was P1123 Oxygen Sensor (MAS) and I tried using Brake Clean but now I get P123 which is 02 Sensor Circuit No Activity Detected Bank 1 Sensor 1. I am thinking to get a new MAS Sensor and see if that solves the problem. Any ideas would be appriciated.

You have a bad oxygen sensor, passenger side, before the catalyst.

NEVER use solvents around o2 sensors, it destroys them

AFJ

Error Code Resolved
 

I replaced the MAF Sensor and have 112 miles with no Engine Light. I had replaced the O2 Sensor already. Since I figured out from other posting information that the MAF was probably the main problem I tried the Brake Clean as a last ditch effort to not have to replace it, but I did.