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07-23-2019, 02:28 PM
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#11 |
  
Drives: '08 2zr swapped Vios M/T Join Date: Oct 2012
Location: Caledonia Ont.
Posts: 2,938
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You are definitely correct about the newer smart ecu's and the 2ndary O2 sensor influencing AFR's. I put 2 defoulders in my outback for a p0420 code and I ended getting 2 other O2 sensor codes showing delay in reading and low voltage. I could see the voltages between the bank 1 and 2 sensors with my ultra gauge during driving. It essentially caused it to read very delayed and read lean. I removed it due to this.
Earlier 1st gen ecu's the 2ndary O2 sensor was only for emissions and did not influence AFR's. Good job trouble shooting so far. I was surprised that you weren't getting boost until 5k rpm, do I'm glad you found the issue
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