[13_wrxMN]

My car just threw a code for the catalytic converter and I’m thinking of getting Turbo XS High Flow Catalytic Converter pipe. Would this fix my issue? Also will it still throw a code?

 

[zax]

Post the CEL code.

 

[13_wrxMN]

Post the CEL code.

P0420

 

[zax]

P0420

Consider the fact that this code can also be (and most often is) caused by:
1. Gross exhaust leak prior to the rear O2 sensor
2. Malfunctioning rear O2 sensor

I'd start there.

This

Turbo XS High Flow Catalytic Converter pipe.

Would require additional engine mapping.

 

[13_wrxMN]

Consider the fact that this code can also be (and most often is) caused by:
1. Gross exhaust leak prior to the rear O2 sensor
2. Malfunctioning rear O2 sensor

I'd start there.

This

Would require additional engine mapping.

Okay, should I just replace the rear O2 sensor?

 

[SD_GR]

I’d not. I’d troubleshoot the above causes first.

Wait — is the sensor even present?!

Since you’ve swapped exhaust why have you not eliminated the code via napping? (I must be missing something?)

 

[zax]

Okay, should I just replace the rear O2 sensor?

Start in the order I posted.