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Old 03-06-2023, 06:38 AM   #76
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Join Date: Aug 2018
Location: Woodland Wa
Posts: 1,229
Originally Posted by Radman View Post
Replaced the crank position sensor, upstream O2 sensors, and the purge valve under the left side intake manifold.

P0446 code went away but I get O2 sensor codes without a CEL. Hopefully it's not an issue with the wire harness but once I get new anchors installed for my lift I'll start rotating the O2 sensors and see if any codes follow particular sensors or not.

On the bright side, the car drove much better. Very happy to be able to take her out for a spin again.
If you do a little research on how the Durametric or rather "Porsche" portrays or interprets fuel trims you can use the Durametric to tell which O2 sensor or sensors are causing the codes.
Not hard to do you just have to understand Porsche's fuel trim methodology and the relationship between O2 sensors and fuel trims.

If you have access to an OBDII scanner that shows fuel trims as a percentage rather then the Porsche Durametric method it is a little easier to interpret the fuel trims.
fuel trim data can be very useful in diagnostics of engine performance (running) issues.

Although switching sensors around to see if the signal or code follows a sensor is a common practice it is not a good one. It can cause other issues.
Everything on these cars and any modern day car is electronic so they can be tested with a scanner or Oscilloscope or something as simple as a Digital Multi Meter.

I take it that if your not getting a check engine light but your seeing codes....So your looking at pending codes???? What are the codes specifically.????

How many miles on the O2sensors????
They tend age or the signal from them tends to begin to slow down as they age.
Usually starts around 100000 miles
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