My 2008 Buick enclave has a P0402 code. I started with repairing the misfire with ignition coils and was left with a catalytic converter low efficiency bank 1 reading. I purchased the converter which I was told that it's location is in the rear, right side of the motor, near the firewall. The only symptoms of a bad converter I'm having is poor fuel economy. In addition, I also put my car in park and push the gas pedal to the floor, and reached 4 RPM and I noticed smoke coming from the exhaust. My question is: Is that the correct location and part to correct the PO402 code?
What makes this problem better or worse?
Driving over 60mph
How long has your 2008 Buick Enclave had this problem?
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