Boxster with P1124 and P1126

[Rickvd]

Blue62 thank you for sharing your diagnostic approach. I don’t have this problem but you intel will help understand how better to use the durametric tool. Thanks - Rick

[blue62]

Originally Posted by Rickvd

Blue62 thank you for sharing your diagnostic approach. I don’t have this problem but you intel will help understand how better to use the durametric tool. Thanks - Rick

Always happy if I can help someone
Two things I think are very important when trying to diagnose a engine performance problem. (CEL or P codes).
1. Todays engine management systems (OBDII"s) number one priority is Catalytic Converter Performance.
Power, fuel economy, what ever is secondary.
So when ever I get an engine performance problem I try to figure out how it relates to Catalytic Converter Performance.

2. A vacuum test is usually the first test I do because:
It is simple to do: the gauge is under $25.00.
A vacuum leak is unmetered air. Meaning no sensor in the OBDII system is reading that excess air until after the combustion cycle. So a vacuum leak many times does not trigger any codes. It may show up as positive short term fuel trim but other things can cause that as well.
If you don't have a vacuum leak you have just eliminated a ton of potential problems.
The vacuum gauge can give you a ton of other information about engine performance and condition other than just a vacuum leak.