Checking my Impreza for codes recently the following codes have registered:

P0340 - Camshaft Position Sensor Circuit Malfunction
P0301 - Cylinder 1 Misfire Detected
P0302 - Cylinder 2 Misfire Detected
P0303 - Cylinder 3 Misfire Detected
P0304 - Cylinder 4 Misfire Detected

It does feel a bit sluggish when off boost.

I have been searching the forums and have come across a few people who say the Neutral Position Switch/Sensor can bring up misfires?

It had Spark Plugs done 20,000 ago - Platinum NGKs.

As I've recently purchased it, couldn't be sure what else it may have had done.

Can anyone help?

Cheers

 

P0340 - Camshaft Position Sensor Circuit Malfunction this is more than common on WRX this cause if you are hitting the rev limiter.
After few starts this error code will disappear.

PO301-304 this can cause as you are said NPS,but can cause something different.


Jura