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CEL Codes, Need Advice

1flymk6gti

Go Kart Champion
The following codes have popped up:
-p0141
-p0140
-p0036

I have about 57k miles on my car and have been stage 2 for a while. The downpipe I am running has no cat and I am a CCTA engine code, I also have a spacer for the secondary o2 sensor.

This has happened before but it was just a p0420 code and I cleaned the o2 sensor and spacer and it went away. Now I delete the codes and in 30-40 miles they pop back up. I am thinking I have a shot secondary o2 sensor, just looking for advice.

Thanks.
 
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