I have a 2007 mazda 3 its throwing a P0037 code. I replaced the sensor but still have the code and cant find any info on how to get rid of this CEL. Please help!!!!

 

I would just say take to a service garage

 

Where is the pcm located in a 2007 Mazda 3 2.0? What connections am I looking for at the pcm? I already replaced the sensor.

 

I don't have the money or time for that. I need to get the car inspected and in NY you can't unless all check engines are cleared.

 

POSSIBLE CAUSE
• HO2S heater malfunction
• Connector or terminal malfunction
• Open circuit in wiring harness between main relay and HO2S terminal C
• Short to ground in wiring harness between main relay and HO2S terminal C
• Open circuit in wiring harness between HO2S terminal D and PCM terminal 2C
• Short to ground in wiring harness between HO2S terminal D and PCM terminal 2C
• PCM malfunction

Also which sensor did you replace? The 1 closest to the exhaust Manifold or the the 2nd sensor lower down the exhaust?

 

I changed the 2nd one.