Looked around for similar threads and found nothing. Please offer some advice if you can.

Completely stock 2010 SSTC. HAHN Racecraft O/R Downpipe installed. Next morning the car threw P2261- something about the vacuum can/bypass valve. Code cleared, and not seen since. Now, the car is throwing P2195: "*The ECM has detected the HO2S11 voltage too low during a power enrichment period. *Failed HO2S11 (Bank 1 Sensor 1) * Failed HO2S11 (Bank 1 Sensor 1) heater circuit."

HAHN claims this should not happen. I knew someone with the same pipe on their 08 and this did not happen. However, said 08 only had the pillar boost gauge, while the 2010's came with the digital readout screen standard. This digital readout has an air/fuel gauge. Since the pipe was put on the 2010, the A/F is blank "No Data Available." Could the digital gauge's possible coupling (I don't know if it actually is or not) with the ECU to read A/F cause the computer to throw the codes? Or is the O2 sensor broken? Thanks.

 

Did you unscrew the post-cat O2 sensor while it was still plugged in? In other words, did you twist the wires?

 

No

 

Is your car idling roughly or too fast?

 

No, I don't believe so.

 

bump

 

anything else?? Anybody know why this would be happeneing? 02 code on a Hahn DP?

 

It has nothing to do with your downpipe. B1s1 is your primary wideband o2 sensor. Make sure it's connected and in place. If it is, you probably need to replace it. I just had to do this as well and it fixed all my problems.

How many miles are on your car? Mine had roughly 45,000 when I had to replace the sensor.

 

Chicken's right: that is the wideband O2 sensor, but it's odd that it happened right after you put in a downpipe. Sounds like a serious exhaust leak. Did you replace the crush-gasket when you did the DP? If not, are you sure the old one was still in there?

 

I didn't replace mine. And I have no leaks at all. Only code I have is 420 though. Must put o2 default in

 

Yeah. I had to disable that one even with the catted ZZP DP.

 

Just out of curiosity, did your car "buck" or hesitate right before the code popped up and/or the screen said "No Data Available"? I have that happen sometimes even with a catted downpipe, and I'm wondering if it's related.

 

Go get tuned.

 

Have you figured this out, OP? I just replaced my crush-gasket this week when I put my ZZP DP catted-DP back on. I removed it for inspection and noticed a small area around the DP flange where there was some soot. I definitely had a small exhaust leak from using the same gasket too many times. I had no code, though.

 

Cool. Stock pipe is back on. But, thinking about giving it another try with special attention to the issues raised here. Thanks, guys.

 

@Stamina: Actually, in the weeks before I put the pipe on, there were 2 or 3 times my car hesitated (and bucked as a result?) going into first gear, and I don't think it was a clutch problem as it felt related to the motor and I felt the effect in the gas pedal, it just didn't want to go. This was more of a hiccup though, and it hasn't happened since?