Originally Posted by hondas2000
I put the test pipe on my s 2000 and the next day my check engine light came on, is there any way i can reset it because i can rest the maintance required. thanks
It's a secondary O2 Sensor code most likely. Doesn't do anything except turn on the light.
You can wire in an O2 simulator, or if the O2 is still in the test pipe (ie, the test pipe has an O2S bung) then remove the O2, wrap it in tinfoil (just the sensor part!) and reinstall it in the test pipe. The tinfoil will burn off after 3-6 months but the CEL will be gone until then.