i just pulled the codes for the CEL and it came up as
P0171-P0174 Lean on Banks 1 and 2
PO161 - Downstream Heated Oxygen Sensor Heater circuit fault - Bank No. 2.
for the P0161, do i need to change the O2 sensor
FWIW, my dad drove my car the other day and filled it up with 87 octane, i usually use 93. About 15 miles after he filled it up the CEL came on for the first time. Now about 2 weeks later and 150 miles i go to check the codes and thats what i got. i've been filling it up with 93 octane every 50 miles to try and balance out the mixture and hope it solves my problem.
What do you think?
