Knock sensor code; diagnoses

[JCOWART]

So I have no engine light lit up on the dash but Ive have the P0327 code for many years. I changed the knock sensors when I did the coolant pipes but code remained. So can anyone advise me on other issues such as wiring issues or problems with the ecm? Can anyone advise me on which way the wiring runs through to the ecm? There is never a dash light but there are drivability issues; hesitation, lugging in low rpms and wont shift until the pedal is way down in the floor. Gas mileage is about 15mpg, I dont know if that is common or because its had this error the entire decade weve owned it.

Thanks

James C

[JFP in PA]

That code is usually associated with lower than expected voltage signal from the sensor, which can be a wiring issue or a problem with the DME itself.

[JCOWART]

So it seems that initially, it might be easier to get to the harness connector at the DME end. But what can I test at that end with the harness unplugged? resistance to ground? and perhaps compare the two knock sensors values and they should be close right? That way I could perhaps start to pinpoint if it is a wiring issue. I really dont want to go in the valley again. So lets say, I actually check the wiring from connector to connector and it looks good. How do you verify a problem with DME? Just procees of elimination? Im good with mechanical and pretty good with a multimeter; Im just looking for peoples experience that found out what the issue was.

Thanks

James C

[JFP in PA]

Here is the documentation from the Porsche DME manual
P0327
210 Knock sensor 1 - below limit
Diagnosis conditions
• Engine speed more than 3600 rpm
• Engine load greater than 45 %
Possible fault cause
♦ Break in wiring or short to ground
♦ Contact corrosion on the connector
♦ Knock sensor loose
♦ Short circuit to B+
♦ Knock sensor
♦ When a fault is stored, the ignition angle is retarded for all cylinders
in the range in which knock control is active.
♦ Knock control adaptation is inactive.
♦ If knock control becomes active here, this may indicate engine
damage (increased noise level)
Affected terminals
Terminal III/49 and III/50
Diagnosis/troubleshooting