So I guess i need to know...do i have to have the upper and lower sensors installed. I thought the second one was there just to make sure the cat is working properly. And since ive got a test pipe, it would throw a code anyways, right. And by the way thanks everyone for the feedback!

 

http://www.aemelectronics.com/search...ywords=no+weld you could also try this. just requires drilling a hole

 

That sounds like trouble to me! Good luck.

 

Yes you need them both in. The primary is a A/F sensor, not an O2 sensor. At the cat is the O2 sensor, and yes your ecu isn't going to like not having one of those operational. Unless you go into the ecu, and disable the ecu to look for it.

And your afr's are fine then, I figured you were talking about WOT since you were talking about pulls. As long as you aren't spiking above 13.9's during WOT you're in the trouble free area.

 

So then what is the difference between the two sensors? Measuring air/fuel sounds the same and measuring oxygen.

And an update: went to autozone to get some feeler gauges and had the guy run my codes. Now its only throwing a random misfire (P1399) and O2 sensor heater malfunction (Sensors 1 and 2)(P0135 and P0141.) Now this is while i had the primary sensor installed. Im wondering if I could have a bad sensor. Is there anyway to test an O2 sensor besides replacing it?

 

They're different part numbers. Does it sound redundant? Absolutely.

The header on is for measuring AF/R ratios only as far as I'm aware of; it is wideband although it is ~1.00 off, or at least the ecu reads it ~1.00 off.

The cat is I'm suspecting oxygen and other smog related values, as well as to make sure the cat is infact doing its job and not breaking/broken. I suspect it's more of the latter, because you can disable the cat sensor through flashpro, and I'm assuming ECU piggybacks as well (although I haven't used others), and it doesn't effect the car in the least bit. As far as I know all you can do is test the voltage, replacing would be the only way to test operation I think.

 

Do you have anything in the test pipe to trick the secondary o2 sensor.if not then get one or make one out of spark plug anti foulers. And a word of advice Bosch four platinums are garbage, stick with some form of ngk plugs.

 

You took out your primary O2 sensor, you are stupid /thread.

 

No, i dont have the secondary O2 installed. I'm looking for a dummy sensor that will trick the ecu into thinking the sensor is in a fully functioning cat. If anyone knows where i can get one that would be great! And I made a mistake on the plugs...what I've been running is the bosch fusions, but I might go for some NGKs.

 

Do a quick search on "test pipe anti fouler" and i'm sure you will find what you're looking for. That's what all the guys without the CEL fix on their test pipes do to avoid getting the CEL. You can go get them at your local auto parts store.

If you don't want to deal with that just go on ebay and search "CEL fix" and you will also find what you need.