Code P0130 adn p0133, after installing header and downpipe Options

[msk59]

Hello: After installing the header and getting it all set, I am getting these two codes. I reset them once and these two come back again. I will check for leaks etc and the reading on the first O2 sensor (7aFE engine stock, 1996 ST HB). What else I need to look for?

How do I check for sensor circuit heater?

thanks in advance.

This post has been edited by msk59: Jan 8, 2016 - 1:25 PM

[msk59]

Ok the light is back ON after installing the new O2 sensor. Can someone please tell me how to systematically check the system to see where is the issue. Obviously, it is not the O2 sensor. I will check for leaks one more time. The new header has the flange type with two studs to install O2 sensor. I have replaced the gasket there. There are no leaks between the header and the downpipe.

1. So How do I check to see whether the ECU is sending the signal. I have a test meter.
2. How do I check to see if my O2 sensor is working properly.

I have to factory Manual for this car (1996 ST with 7AFE) but it asks for special Toyota SST which I don't have. YouTube University says to check for voltage at the ECU end and check for resistance at the O2 side. Is this correct. Any help would be appreciated.