does any one know what this means
P0038 ho2s bank 1 sen 2 circuit heater

call these ppl they might know

http://www.actron.com/publish/2005/01/19/pdf_english_16298.pdf

also you left out the word high at the end of that

Any chance you have an aftermarket header on that baby?

If so.... TADA. Go antifouler or O2 Sim.

I have a header and my code is p0420 Catalyst System Efficiency below Threshold

nope dont know

Seminoles, you need to hang out with real *real* car guys ;)

Here are the trouble areas for your DTC (P0038):
- Short in HO2 sensor heater circuit
- HO2 sensor heater
- EFI relay
- ECM

My guess would be is that sensor heater or heater wiring was damaged when you took the sensor out, it's the one on s-pipe, btw. The fix - new sensor, luckily that second one is cheaper than the one on the header.

P0420 possible trouble areas:
- Gas leakage from exhaust system
- A/F sensor (sensor 1)
- Heated Oxygen (HO2) sensor (sensor 2)
- Front exhaust pipe (Three–Way Catalytic Converter [TWC])

My guess is that you have an aftermarket header that eliminated first cat, so your fix would be to get this famous cheap anti-fouler mod. If that does not help - then a real 02 simulator, if not - put stock cat back ;)