I tried looking all over the forum for exact responses but couldn't get them so here it is:

Ok so I had my OEM cats replaced with Stillen hfcs and in the process the passenger side o2 sensor broke. I havn't had an o2 sensor there ( bank 1 sensor 2 ) for a while now so I know that is why I've been getting a SES light.

But when I went to aap, they told me I have two codes as follows:

P0037 Bank 1 Sensor 2 o2 Sensor Control Circuit Low
P0159 Bank 2 Sensor 2 o2 Sensor Slow Response

The first one is expected however I would like to know what "Control Circuit Low" really means in regular language if it really means that I don't have an o2 Sensor there.

The second one is not expected to me. I successfully transfered that o2 sensor from the OEM Cats to the Stillen Cats so why is the driver side cat throwing that code? What does "slow response" mean anyways?

The exhaust and cats both were put in by hand and not power tools, could that also have an affect on these codes and leaks etc?

I really need to know what exactly to do, what do I need to get. I already placed an order for OEM cats for inspection but which o2 sensor do I need? Hopefully its not BOTH thats faulty...

 

I should also add that the exhaust sounds like theres a leak... and the bulk of the sound is coming from the hfcs area... near the rear of the front tires...
Also when I turn the AC or heat on you can smell the gas kind of smell in the cabin... just a couple of symptoms...

 

Sorry to bump this thread, have you solved this problem? I'm having the same issues, exhaust leak with the following codes

P0031
P0138
P0037

all 02 sensor codes. The car has 2 HF test pipes, don't know the brand I just bought the car, and the o2 sensors seem to have defoulers on it but the wires seemed like if it was throwing codes I wouldn't be surprised.

Just trying to see if anyone found a fix before I drop $300+ on new sensors...

 

sensors are much cheaper than $300...
www.rockauto.com <<< the cheapest site i've found for these so far

how many miles on your car? sensors don't last forever....the non-foulers may not be helping enough to keep the code from going.

 

I just bought the car last week, there's now 104,xxx on it. I bought a new Y pipe online the other day with gaskets which will help this honda sounding exhaust leak...

When I put it on this week I'm gonna take off the upstream sensors and switch them around to find the problem.

edit: thanks for the link! very reasonable prices