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Year/Make/Model: 2009 Mazda Mazdaspeed 3 Mileage: 87,000 Location: Colorado Concern: Check engine light, nothing seems to be affected to the car while driving from what i can tell. Gas mileage is lower than normal. DTC's: P0134 O2 sensor circuit no activity detected bank 1 sensor 1, P2246 O2...

Hi, I just wanted to hop on here because I currently have a check engine light on a 2009 Mazdaspeed 3 with 87,000 miles on it reading with the codes P0134,P2246,P0031,P0032. The car currently has a catless down pipe with a high flow cat after the second O2 sensor, not sure what exhaust it is...