Engine Check Light: P1128 & 1130

[Lowski]

I had these two codes in the past.

http://986forum.com/forums/boxster-general-discussions/72288-p1128-p1130-running-fine-turned-into-barely-running-engine.html

The short version is I had a bad MAF. To get to that conclusion I ended up monitoring the fuel trims. A Durametric or other scan tool that can read fuel trims values will tell you if have a vacuum leak or not. If you can determine if you have a vacuum leak or not then you can focus on either fuel or air as thstone suggested.

Originally Posted by Jonconsean

I told I bought it new at Autozone.

What brand of MAF did you buy? You may have gotten a bad or cheap one?

The general consensus I found online was it should be Bosch. If I remember right the Porsche branded MAF sensors are Bosch with a Porsche stamp. Some on the forums state that Porsche hand picks the betters MAFs from the lot for the Porsche branded ones. I can’t confirm or deny this. The moral of this story is maybe you Autozone MAF may be bad out of the box. It wouldn't be the first time a new sensor failed.

Originally Posted by Jonconsean

He is charging me $400 for a new MAF sensor.

$400 to change a MAF is way too high in my opinion. The sensor is about $200 bucks for a Bosch. It takes longer to get to the engine then it does to change the sensor.