I had a CEL for a month and just figured it was my post-cat 02 since I have no cat converter. Finally hooked a Tech2 up to it and pulled these codes:

P0130 - Circuit Closed Loop (CL) Performance Sensor 1
P0133 - Slow Response Sensor 1

So this in the pre-cat sensor in my header. It's only a month old and I'm not sure how it could be faulty already so I'm not wanting to throw a sensor at it yet. While testing a few other things I noticed that I was only pulling 1.9v from the PCM side O2 harness. Traced the wires as far back as I could and they appear fine. Now I thought normal operating voltage was in the 4-4.5v for the sensor. Is this correct or does the supercharger re-flash change the voltage for any reason?

Car is an LD9 with the MP45, header and 2.5" piping all the way back with no cat.

in order to check the o2 sensor voltage, you really need to have an ocilloscope because it fluctuates way too fast for a dvom. also, operating voltage for a narrowband o2 sensor is between 0.1 and 0.9 volts.



87 Firebird
All stock...........lol.

WTF why not post in the right section ? douche canoe