S14 knock sensor help please

[gtd2000]

P0325 = KNOCK SENSOR
P1445 = Purge volume control valve circuit.

On my car, I experienced high gas consumption when the O2 sensor gave up a few years back.

I can't see that your subs would be causing a significant rise in fuel consumption unless they weigh like a ton each...

Found this over at Nico:

Got a solution for you. The purge volume control valve is a pain to remove and replace. Leave the old one in and splice in one from a 96 to 98 Altima. The connectors are different. You could either chop off the connector from the engine harness and wire up the Altima connector, or keep the original harness connector and splice the old valve connector to the new valve. The 98 Altima purge valve is easy to obtain as it sits on top of the motor. I just traced back the harness to give myself a little extra wire to work with, I took the valve, connectors, and the short bits of vacuum line. I capped the lines off and spliced in the valve. Polarity doesn't matter, so ... The connector is easy to find, but there isn't much slack in the harness to work with. This was the easiest fix I could come up with. Code's are gone. I had the IACV code, too. Now, I don't. Mileage improved.